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FORD BRONCO
-> BRAKE SYSTEM; 4WABS, RABS, Self Test...
-> Antil-Lock Brake (ABS) - RABS (RABS II 87-92) & 4WABS (93 - 96)
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WELCOME to MIESK5's BIG BRONCO LINKS
This is a Ford Bronco, Truck & Van Technical, Parts & Vehicle Classifieds LINKS site developed by the MIESK5 Family and is not affiliated with the Ford Motor Company in any manner.
Although we initially developed this site for 78-96 Big Broncos, information in many Links also applies to Ford Trucks, Vans & Cars.
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Fuse E Blown, ABS Light On, Back-Up Lamps Inoperative, DRLs Inoperative, MIL On, Speedometer Inoperative TSB 95-02-11 for 92-95 Bronco & F Series
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Mercury Sensor Removal Guide, Bronco (ABS sensors 93-96 & under-hood lights) locations, pics, removal instructions (Explorer), etc.
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RABS Inoperative (dash lights on, etc.); E4OD transmission control switch (TCIL) wiring may be misrouted causing a short in the steering column and a blown # 17 fuse for 92-96 in TSB 92-22-5 for 92 Bronco & all Light Trucks
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4WABS Acceleration Switch (G-Force Sensor) Removal in 93-96 Bronco/93-02 Explorer & Mazda Navajo/95-01 4x4 Ranger & Mazda B-Series Pick-Up/97-02 AWD Mountaineer; 1. Raise and support the vehicle. 2. Locate the ABS G-Force Sensor on the left frame rail, right below the driver. 3. Remove the two nuts. 4. Unclip the fuel filter from the vehicle frame (on some models). 5. Disconnect the harness connector. 6. Remove ABS G-Force Sensor.
Source: by elvsolutions.org
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4WABS Acceleration Switch (G-Force Sensor) Removal in 93-96 Bronco/93-02 Explorer & Mazda Navajo/95-01 4x4 Ranger & Mazda B-Series Pick-Up/97-02 AWD Mountaineer; 1. Raise and support the vehicle. 2. Locate the ABS G-Force Sensor on the left frame rail, right below the driver. 3. Remove the two nuts. 4. Unclip the fuel filter from the vehicle frame (on some models). 5. Disconnect the harness connector. 6. Remove ABS G-Force Sensor.
Source: by mde.state.md.us
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4WABS Application Chart, TEVES MARK 4, Bronco & Ford
Source: by Larry C CarleySoftware.com via aa1car.com
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4WABS Bleeding in 93-96 Bronco; "...The 4-wheel anti-lock brake system can be bled in the conventional manner unless the Hydraulic Control Unit (HCU) has been replaced. Only perform this procedure if the HCU has been replaced..." (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via Autozone
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4WABS Brake Pressure Control Valve; "... The brake pressure control valve regulates pressure to the rear brakes to create a balance between the front and rear brakes ..." read more (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Component Locations; "...> Anti-Lock Hydraulic Control Unit (2C215) located in the front of the engine compartment on the left frame rail.
> Anti-lock brake electronic control module located in the engine compartment behind the driver's side headlamp on a bracket mounted on the surface of the plastic fender apron.
> Two front brake anti-lock sensors (2C204) are attached to the suspension knuckles. The front brake anti-lock sensor indicators (2C182) are pressed onto the backside of the rotors.
> Rear axle speed sensor integrated into the rear axle housing.
> Acceleration sensor attached to the left frame rail under the driver.
> Stoplight switch (13480) located at the brake pedal (2455).
> Main relay (14N089) located in the power distribution box.
> Pump motor relay located in the power distribution box.
> System diode located in the relay box mounted behind the power distribution box with the main relay.
> Fuses for system power and the pump motor are both located in the power distribution box..."
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Connectors Diagrams for 93-96
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Control Module Bypass for PSOM Operation due to Bad 4WABS Control Module; "...jumper 14 to 21, & 39 to 22..." MIESK5 NOTE; See diagram. I did this on our 96; The 4WABS Control Module was toasted; 2 yard 4WABS Control Modules were also bad; NO RETURNS!
Source: by Steve83 (Steve, That dirty old truck) at FSB
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4WABS Control Module Bypass for PSOM Operation due to Bad 4WABS Control Module; "...To bypass the 4WABS module & feed the ABS signal directly to the PSOM, jumper 14 (CKT 530, LG/Y)to 21 (CKT 519 (LG/BK) & 39 (CKT 491 (O/LB)to 22 (CKT 523, R/PK)
..." MIESK5 NOTE; see Steve's 4WABS Connectors Diagrams for 93-96 for the Module's Connector Pin-Outs
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Control Module Description, Location & Operation; "... The anti-lock brake control module is located on the anti-lock brake hydraulic control bracket mounting bracket located outside of the engine compartment attached to the outer frame rail. The module is an on-board diagnostic non-repairable unit consisting of two microprocessors and the necessary circuitry for their operation. These microprocessors are programmed identically. The anti-lock brake control module monitors system operation during normal driving operation as wheel as during anti-lock braking and traction assist cycling, if equipped ..." read more (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Control Module Overview; "...A new light truck 4-Wheel ABS was introduced as standard equipment on the 1993 Explorer and Bronco, and it was revised in 1994 on Broncos, requiring a different control module revision for 94-96 Broncos, compared to the original '93 Bronco module. The anti-lock brake electronic control module is located in the engine compartment behind the driver's side head lamp on a bracket mounted on the surface of the plastic fender apron. It is an on-board diagnostic, non-repairable unit consisting of two microprocessors and the necessary circuitry for their operation. These microprocessors are programmed identically. The anti-lock brake electronic control module monitors system operation during normal driving as well as during anti-lock braking. In addition, the anti-lock brake electronic control module provides a speed signal to the programmable speedometer/odometer module (PSOM)..." read more
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Control Module pic #1 in 94-96
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Control Module pic #2 in 94-96; Ford pn F47A-2C219-FA
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Control Module PN Label F37A-2C018-BB pic in a 93 Bronco. "...NOT for 94-96 Bronco"
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Control Module Removal in 93-96; "...Disconnect the plug from it, remove the 10mm bolt holding it in and slide it out of the keyway" (see lower image)
Source: by Froggmann (Ken P) at froggmann.com
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4WABS Cut-Off Switch Installation 93-96 Bronco
Source: by Froggmann (Ken P) at froggmann.com
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4WABS Cut-Off Switch Installation 93-96 Bronco
Source: by Froggmann (Ken P) at The Web Wheeler
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4WABS False Activation, Ford 4x4 & Bronco;
Kelsey Hayes EBC310/325 4-wheel ABS systems; Air Gap
Source: by Bill W at mightyautoparts.com
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4WABS Front Wheel Tone Ring Removal & Installation (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Ground Location in 93-96; "...Grounds 10-11 Rear of LH fender apron (Driver's Side) Component 4WABS Control Module, 4WABS Data Link Connector, 4WABS Relay #1..."
Source: by miesk5 at Ford Bronco Zone Forums
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4WABS Hard or Soft Brake Pedal; Stuck shut inlet (isolation) valve (hard) or leaky outlet (dump) valve (soft). Leaky inlet (isolation) valve during ABS (soft). Hydraulic leak in brake line or hose, fitting, brake master cylinder, wheel cylinder, or caliper. Air in brake system. Little or no vacuum boost. Stuck or inoperative wheel cylinder or caliper. Pinched or crimped brake line or hose.
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Hydraulic Control Unit (HCU) & Valves Wiring Diagram & Overview; "...The front inlet valves should read 5-8 Ohms each; all other valves should read 3-6 Ohms each. Sensors should read 800-1400 Ohms across the pins, and more than 10 Ohms from the metal shell to either pin. The pump motor sensor should be 5-40 Ohms. The acceleration sensor is a group of switches which should be closed when the truck is stationary & level. When the sensor is tilted ~1" up in the rear, pins 2-3 should go open; when tilted ~1.5" up in the front, pins 1-3 should go open..."; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Hydraulic Control Unit (HCU) Bleeding Procedure (DIY)
Source: by SigEpBlue (Steve) at FSB
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4WABS Hydraulic Control Unit (HCU) Description , Location & Operation; "...located outside of the engine compartment on a bracket which attaches to the left frame rail. It consists of the following: Brake pressure control valve block assembly, Pump motor, Hydraulic control unit reservoir w/ a fluid level indicator assembly..." read more (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Hydraulic Control Unit (HCU) Motor; "...pulled a motor off a crown vic, the unit it self was differant but the motor was the same. Cost me 20 bucks. OH and the wire conector was differant as well but I just drafted the one from the nfg motor on to the crown and it works great. That was 4 years ago. no problems yet...its only 2 screws that hold it in. And best part is it doesn't open the system so you won't loose fluid and won't need to bleed it. Now all you need to do is go to the bone yard and find one..."
Source: by bossind (boss, Steve) at FSB
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4WABS Hydraulic Control Unit (HCU) pic in 93-96
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Hydraulic Control Unit (HCU) Removal & Installation (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Hydraulic Control Unit (HCU) Test, Fig. 21 & 22 (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Lack of Deceleration During Medium/Hard Brake Application; Stuck shut inlet (isolation) valve or leaky outlet (dump) valve -- rear axle ONLY.
Possible Source(s):
� Hydraulic leak in brake line or hose, fitting, brake master cylinder, wheel cylinder, or caliper.
� Air in brake system.
� Little or no vacuum boost.
� Stuck or inoperative wheel cylinder or caliper.
� Pinched or crimped brake line or hose.
� Ineffective brake shoe or pad linings.
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Master Cylinder and Brake Fluid Level Switch; "... The master cylinder reservoir is a clear, translucent plastic container with three main chambers: An integral fluid level switch is part of the master cylinder reservoir assembly. A low pressure hose is attached to the master cylinder reservoir which feeds brake fluid to the hydraulic control unit reservoir. The brake master cylinder reservoir and brake master cylinder filler cap gasket are serviced separately ..." read more (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via Autozone
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4WABS Master Cylinder; "... is a tandem master cylinder. The primary (rear) circuit feeds the right side front and left side rear brakes. The secondary (front) circuit feeds the left side front and right side rear brakes. The master cylinder is serviced as a complete assembly. ..." read more (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Overview; "...The 4-wheel anti-lock brake system (ABS) prevents wheel lockup by automatically modulating the brake pressure during an emergency stop. By not locking the wheels, the driver can improve steering control during hard braking and stop the vehicle in the shortest possible distance under most conditions. The ABS controls both front and rear brakes separately. The brake pedal force required to engage the ABS function may vary with the road surface conditions. A dry surface requires greater force, while a slippery surface requires much less force. During the ABS operation, the driver will sense a pulsation in the brake pedal, accompanied by a slight up and down movement in the pedal height. In addition, a mechanical noise from the engine compartment may be heard. The pedal effort and pedal feel during normal braking are similar to that of a conventional power brake system. When the brakes are applied, fluid is forced from the master cylinder outlet ports to the anti-lock hydraulic control unit (2C215) inlet ports. This pressure is transmitted through three normally open solenoid valves contained inside the anti-lock hydraulic control unit, then through the outlet ports of the anti-lock hydraulic control unit to the wheels. The primary (rear) circuit of the master cylinder feeds the rear brakes. The secondary (front) circuit of the brake master cylinder (2140) feeds the front brakes. If the anti-lock brake electronic control module senses that a wheel is about to lock, based on wheel speed sensor data, it pulses the normally open solenoid valve closed, for that circuit. This prevents any more fluid from entering that circuit. The anti-lock brake electronic control module then looks at the sensor signal from the affected wheel again. If that wheel is still decelerating, it opens the normally closed solenoid valve for that circuit. This dumps any pressure that is trapped between the normally open valve and the brake back to the reservoir. Once the affected wheel comes back up to speed, the anti-lock brake electronic control module returns the valves to their normal condition allowing fluid flow to the affected brake. The anti-lock brake electronic control module monitors the electromechanical components of the system. Malfunction of the Anti-Lock Brake System will cause the Anti-lock brake electronic control module to shut off or inhibit the system. However, normal power assisted braking remains. Malfunctions are indicated by the amber ABS warning light inside the vehicle. The 4-wheel anti-lock brake system is self monitoring. When the ignition switch is placed in the RUN position, the anti-lock brake electronic control module will perform a preliminary self check on the anti-lock electrical system indicated by a momentary illumination of the amber ABS warning light in the instrument cluster. During vehicle operation, including normal and anti-lock braking, the anti-lock brake electronic control module monitors all electrical anti-lock functions and some hydraulic operations. In most malfunctions of the anti-lock brake system, the amber ABS warning light will be illuminated. However, most malfunctions are recorded as a coded number in the anti-lock brake electronic control module memory and assist in pinpointing the component needing service. If system is OK, Code 16 will be present. The anti-lock brake electronic control module is located in the engine compartment behind the driver's side head lamp on a bracket mounted on the surface of the plastic fender apron. It is an on-board diagnostic, non-repairable unit consisting of two microprocessors and the necessary circuitry for their operation. These microprocessors are programmed identically. The anti-lock brake electronic control module monitors system operation during normal driving as well as during anti-lock braking. In addition, the anti-lock brake electronic control module provides a speed signal to the programmable speedometer/odometer module (PSOM). Under normal driving conditions, the microprocessors produce short test pulses to check the electrical system without any mechanical reaction. The anti-lock brake electronic control module continuously monitors the speed of each wheel to determine if any wheel is beginning to lock. When a wheel locking tendency is detected, the anti-lock brake electronic control module signals the appropriate solenoid valve in the anti-lock hydraulic control unit (2C215) to open or close as well as the pump motor to turn on and recycle brake fluid back to the brake master cylinder (2140). This results in moderate pulsations of the brake pedal (2455) and pump noise which may be heard in the passenger compartment. During normal braking, the brake pedal feel will be identical to a standard brake system. Most concerns which occur to the anti-lock brake system will be stored as a coded number in the Keep-Alive Memory (KAM) of the anti-lock brake electronic control module. This means that once a code is stored, it will be retained by the anti-lock brake electronic control module even with the key in the OFF position. The codes can be retrieved by following the on-board diagnostic procedures. A new light truck 4-Wheel ABS was introduced as standard equipment on the 1993 Explorer and Bronco, and it was revised in 1994 on Broncos, requiring a different control module revision for 94-96 Broncos, compared to the original 93 Bronco module. Although this system shares some of the features of passenger car 4-Wheel ABS and some of the features of light truck Rear ABS (RABS), it has its own unique features, especially when it comes to diagnosing concerns. Here are some general features of the light truck 4-Wheel ABS, some of which are common to the other systems as well: System prove-out at vehicle start-up of the light truck 4-Wheel ABS is the same as for passenger car and 4-Wheel light truck ABS. The amber anti-lock warning light will come on as soon as the vehicle is turned on or started to verify bulb operation, and will go out after 2-3 seconds, provided everything is normal. The 4-Wheel ABS operates in 4 x 4 as well as 4 x 2. In ABS mode, the brake pedal will pulsate and the pump motor noise may be heard from the engine compartment. When ABS codes are read out, code 16 will be present if the system is OK. This code is similar to the EEC's code 111. It basically means that the 4-Wheel ABS Electronic Control Unit (ECU) is indicating that everything is functioning properly electrically. In other words, the components, such as the pump motor and the valves, will activate when needed. Conventional bleed is all that is required for service on the new 4WABS including unhooking brake lines from the hydraulic controller (HCU). However, if the HCU is replaced, a special bleed box and electrical jumper will be required to bleed the replacement HCU. This procedure is not the same as for the passenger car systems...." read more; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Power Brake Booster; "... The diaphragm-type power brake booster is self contained, and is mounted on the engine compartment side of the dash panel. The booster uses engine intake manifold vacuum and atmospheric pressure for its power. It is serviced as an assembly only, except for the power brake booster check valve ..." read more (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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4WABS Pulls During Braking; Fully or partially blocked right front inlet (isolation) valve.
Fully or partially blocked left front inlet (isolation) valve. Frozen or binding caliper (one side of vehicle). Uneven brake pad or shoe wear.
Pinched or crimped brake line or hose
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Self Test & Connector Diagram, Component Locations, DTCs, 93-96; USE THIS PROCESS! "...The 4WABS TEST Connector is red; located at the left-hand side (driver's side) of the engine compartment and marked ANTI-LOCK TEST;
Light Flash Technique 1. Note: If 12V test light is not available, the amber ABS warning light also flashes during this test. Locate test connector in the engine compartment and install 12V test light between Pins C and E. 2. With the ignition off, jumper Pin E to B. 3. Turn key to RUN position. 4. Remove jumper between Pins E and B after 5 seconds. 5. Count light flashes of test light or amber ABS warning light..." read more; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Self Test & Connector Diagrams, Component Locations, DTCs & Possible Causes for 93-96 - see Fig. 3 for using 12 v. light or ABS Light (or Ford's STAR tester-obsolete);
"Locate ABS Test Connector; install 12 v test light between Pins C and E; If no test light is used, ABS warning light will flash; jumper ABS Data Link Connector Pins B and E..." - Miesk5 note use Steve83's process: "1. Note: If 12V test light is not available, the amber ABS warning light also flashes during this test. Locate test connector in the engine compartment and install 12V test light between Pins C and E. 2. With the ignition off, jumper Pin E to B. 3. Turn key to RUN position. 4. Remove jumper between Pins E and B after 5 seconds. 5. Count light flashes of test light or amber ABS warning light..." read more (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Chilton via Autozone
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4WABS Self Test Connector pic in a 95 (near driver's side hood hinge)
Source: by s8c2 (the wagon) at SuperMotors.net
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4WABS Self Test for using 12 v. light or ABS Light & Test Connector Location; "Locate ABS Test Connector; install 12 v test light between Pins C and E; If no test light is used, ABS warning light will flash; jumper ABS Data Link Connector Pins B and E. 1. Note: If 12V test light is not available, the amber ABS warning light also flashes during this test. Locate test connector in the engine compartment and install 12V test light between Pins C and E. 2. With the ignition off, jumper Pin E to B. 3. Turn key to RUN position. 4. Remove jumper between Pins E and B after 5 seconds. 5. Count light flashes of test light or amber ABS warning light...All codes are 2 digits long. 3 to 6 seconds between digits in the same code. 15 seconds between codes. Probably want to run this test at least twice, to get the hang of reading the codes..." read more; - Miesk5 note use Steve83's process for more info
Source: by **DONOTDELETE** at forums.off-road.com
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4WABS Sensor (also called called VSS) Location pic (rear differential) in a 95
Source: by Broncodell at SuperMotors.net
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4WABS Sensor, Front Wheel Location pic & Shield Location pic on Spindle, Front Wheel in 93-96 Bronco; Note, driver's side pn is 44619
LH by SigEpBlue (Steve)
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Sensor, Front Wheel Shield pics in 93-96
Source: by MikeW (Mike W, BroncoNut) at FSB
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4WABS Sensor, Front Wheel, Air Gap; "...Remove the left front brake anti-lock sensor from the wheel end. Inspect mounting boss and sensor mounting plate for any metal flash or debris. Clean as necessary. Remount left front brake anti-lock sensor securely. Measure the air gap between the sensor and tone ring teeth. Repeat in at least two more wheel positions to ensure that gap does not vary as the wheel is turned. NOTE: Feeler gauges can be mounted to a welding rod and inserted between the vanes of the rotor to measure air gap precisely. Is the gap consistent and less than 0.070 inch? Yes - REPLACE left front brake anti-lock sensor. GO to L5. No - gap is greater than 0.070 inch Air gap is too large. REPLACE left front brake anti-lock sensor indicator. Here, you'd just move the exciter ring inward, closer to the sensor, instead of replacing the sensor indicator. GO to L5 No, gap is not consistent Left front brake anti-lock sensor indicator is not pressed on straight or axle end play is too great. GO to L6..."
Source: by SigEpBlue (Steve) at FSB
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4WABS Sensor, Front Wheel, Removal & Installation in 93-96 Bronco; "...Step 10: Remove the ABS sensor shield. This is the part that is on the front of the steering knuckle. It wraps around the silver sensor cover and overlaps the spindle. It can be seen in the picture above on the right hand side of the spindle. Behind the steering knuckle you will find a small 12-point bolt that holds the ABS sensor shield to the knuckle. Use the 6mm 12 point socket to remove this bolt. The sheild on the knuckle should fall off or come off easily. If not, you can PB Blast the spot where the shield rests against the steering knuckle and let it sit for a few minutes, then tap lightly with the SFH. If you have to use force to remove the shield, be very careful not to damage the sensor.
Step 11: Remove the bolt holding the sensor. Above the small bolt you just removed, you will see a larger bolt that holds the rear sensor cover and the sensor against the back of the steering knuckle. Use the 8 mm socket to remove this bolt. NOTE: You will not have to remove the sensor to remove the spindle, only the bolt..."
Source: by Shane C. (BigBlue, bigbluebronk) at FSB
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4WABS Sensor, Front Wheel, Removal & Installation in 93-96 Bronco; "...The front brake anti-lock sensors are attached to the front wheel spindles, and the front brake anti-lock sensor indicators are pressed onto the wheel hub assembly..." (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via Autozone
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4WABS Sensor, Front Wheel, Removal in 93-96 Bronco
Source: by Ian L (stangmata, stangmata50l, Bronco) at bucknakedoffroad.com
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4WABS Sensor, VSS (also called called RABS) & PSOM, PCM Wiring Diagram & Info in 93 - 96 Bronco
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Tone Ring Installation for a Dana 60 in a 95
Source: by Shadofax (TheJuice, The Juice, Mark Z) at FSB
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4WABS Tone Ring Installation Info & pics for a Dana 60 in a 95
Source: by Shadofax (TheJuice, The Juice, Mark Z) at SuperMotors.net
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4WABS Tone Ring Removal & Installation (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via Autozone
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4WABS Tone Ring Removal in a 96; "....... If you have a press or a gear puller try it, but don't press on the bearing in the center of the rotor. What worked for me was you'll notice the lugs are now resting against the ring, I pounded on each lug a couple of times in a star pattern until the ring came off. For reassembly I tapped the ring back on in a star pattern with a rubber mallat and finished it off with a solid tap in the star pattern from the small sledge to be sure it was all the way on. If the sledge has a nice bouce, it's tight..."
Source: by Tom H at ford.off-road.com
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4WABS Tone Ring, Front Wheel pic in 93-96 Bronco
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Tone Ring, Wheel Bearings, & Warn Hub Swap in a 95
Source: by Trucky18 (B'co) at SuperMotors.net
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4WABS Trailer Relay Box Location pic in 92-96; to the right side of the Power Distribution Box, whose cover is open; miesk5 note, squeeze both sets of tabs together & lift cover off; only 1 Bosch style relay is in there
Source: by Froggmann (Ken P) at froggmann.com
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4WABS Troubleshooting; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS VSS Connector Location Diagram in a 94 (part of overhead console wiring diagram series); C911 (left vanity mirror lamp), C1048 (E4OD), C913 (day/night mirror auto-lamp sensor), C271 (inertia fuel shut-off), C223 (electronic shift control module), C1012 (MLPS), C1020 ($r70W output shaft speed sensor), C1049 (4R70W), C328 (safing sensor), C404 (DSS/VSS/ABS rear axle sensor), C417 (trailer lamps), C440 (fuel level sender), C220 (to transfer case), C 117 (C6), C127 (neutral safety switch NSS), C161 (hi/low indicator switch), C510 (left front door disarm switch), C299 (RABS valve assembly), C1012 (MLPS), C117, C1025 (C6 for (7.5 & 5.8 over 8500 GVW only), C440 (front fuel tank pump/sending unit Gasoline engines) , C421 (front fuel level tank sending unit Diesel), C403 (chassis cab & 185 in wheelbase only), C427 (rear tank fuel level sender Diesel only), C441 (rear tank fuel level tank sending unit Diesel), C441 (rear tank pump/sending unit chassis cab & 185 in wheelbase only)
Source: by Ford via Ken B (Kenny's 94) at SuperMotors.net
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4WABS VSS Tone Ring Damage pics in a 95 5.8
Source: by sackman9975 (Scott) at SuperMotors.net
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4WABS Wheels Lock Up During Braking; Hydraulic outlet (dump) valve. � Damp or contaminated rear brake shoe linings, stuck/leaking wheel cylinder, overadjusted rear brakes. � Hung-up parking brake. � Leaking rear axle seal
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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4WABS Wiring Diagram in 93-96; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Brake Light Overview in 92-96; "...All vehicles use a brake warning light in the instrument cluster to warn of system malfunctions. The red warning light for the brakes can show three things; that either the parking brake is not fully released, that the brake fluid level is low in the master cylinder reservoir or the vacuum pressure is low on diesel engine vehicles. The anti-lock brake system uses one amber ABS warning light to alert the driver of malfunctions in the system. The amber ABS warning light will come on for numerous reasons. It warns the driver that the ABS has been disabled. Normal power-assisted braking remains but the wheels can lock during a panic stop while the indicator is on. Certain procedures must be followed to find the concern in this situation. Refer to «Section 06-09B» in the Powertrain/Drivetrain Manual for diagnosis and testing of the system.The yellow anti-lock brake indicator lights up for approximately two seconds when the ignition switch lock cylinder is first moved to ON or START for circuit prove out. The indicator also lights up when the RABS module detects a malfunction in the system. The self-test feature contains codes that indicate the area of the malfunction. When a malfunction is detected, the RABS control module shuts down the system and the yellow anti-lock warning indicator comes on. This permits normal braking. A code can be retrieved by momentarily grounding the diagnostic pigtail (black with orange stripe wire) after it is disconnected from KAM (keep-alive power red wire) and counting the flashes of the yellow ABS lamp. To make sure the diagnostic trouble code (DTC) is not lost from memory, the ignition switch lock cylinder must be left in the ON position before the diagnostic lead is disconnected from KAM power. If more than one diagnostic trouble code exists, only the first code stored will be displayed. Additional codes will be output only after the first fault is corrected..." read more
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Dash Harness pic in a 96 F 150; "...some connectors have been removed..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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DTC 10, Short Circuits, Common Locations TSB 95-02-11 on 94-95 Bronco & Trucks
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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DTC 16 ABS Warning Light On Intermittently with Code 16 & Possible Causes
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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DTC 27, 29, 452, P0502, P0503, PO716, PO718; Insufficient input from VSS.; "...A more difficult problem to identify is a VSS that works, but sends out the wrong signal for a given vehicle speed. In some cases, a wrong reading from the VSS may still cause a code to be set. For example, if the VSS signal tells the computer the vehicle is traveling 60 miles an hour, but the throttle position sensor and MAP sensor tell the computer that the engine is idling, the computer will be confused. And a confused computer should set any of the following codes: Ford 27, 29, 452. On a vehicle that uses the VSS as a safety device, a defective sensor may send out a wrong "too fast" signal, shutting down fuel flow at the wrong time. Although this doesn’t happen often, it can be a difficult problem to identify. The customer will probably describe it as a random or intermittent sudden loss of power and poor performance, onlyto have the engine resume normal operation. Routine diagnostic checks of the engine in the shop won’t show any problem because there isn’t a problem with the engine or the ECM..." read more
Source: by wellsmfgcorp.com
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DTC P0500 Vehicle Speed Sensor (VSS) Malfunction; "... Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS), anti-lock brake system (ABS) control module, generic electronic module (GEM), or central timer module (CTM). If the engine rpm is above the torque converter stall speed (automatic transmission) and engine load is high, it can be inferred that the vehicle must be moving. If there is insufficient vehicle speed data input, a malfunction is indicated and a DTC is set. On most vehicle applications the malfunction indicator lamp (MIL) will be triggered when this DTC is set. Open in VSS+/VSS- harness circuit. Open in TCSS signal or TCSS signal return harness circuit. Short to GND in VSS harness circuit. Short to GND in TCSS harness circuit. Short to PWR in VSS harness circuit. Short to PWR in TCSS harness circuit. Open or short in the vehicle speed circuit(s) (VSC) between the PCM and appropriate control module. Damaged VSS or TCSS. Damaged wheel speed sensors. Damaged wheel speed sensor harness circuits. Damage in module(s) connected to VSC/VSS circuit. Damage drive mechanism for VSS or TCSS. Diagnostic Aids: - Monitor VSS PID while driving vehicle. This DTC is set when the PCM detects a sudden loss of VSS signal over a period of time. If vehicle speed data is lost, check source of where vehicle speed signal originates. Note TCSS does not have a PID, circuitry frequency must be checked for sudden loss of sensor signal..."
Source: by slingblade at The National Lightning Owners Club
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DTC P0500 & Possible Causes; "...Symptoms may include loss of anti-lock brakes; the "anti-lock" or "brake" warning lamps on the dash may be lit; the speedometer or odometer may not work properly (or at all), your vehicle's RPM limiter may be decreased, the shifting of an automatic transmission may become erratic, other symptoms may also be present. A code P0500 may mean that one or more of the following has happened: The Vehicle Speed Sensor (VSS) is not reading (functioning) properly. There is a broken/frayed wire leading to the vehicle speed sensor. Possible Solutions; The simplest thing to do is to reset the code and see if it comes back. Next, check all wiring and connectors that lead to the speed sensor. The location of the sensor depends on your vehicle. The sensor could be on the rear axle (for 93-96 Bronco). If the wiring and connectors are OK, then check the voltage at the speed sensor. Again, the exact procedure wil depend on your make and model of vehicle. If everything looks OK, replace the sensor.
miesk5 note; other problems can include a bad 4WABS controller (behind left headlight), bad wiring or connector pin corrosion or "pin back-out" or shorts/grounds between VSS to controller to PSOM, bad PSOM, etc.
Source: by obd-codes.com
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DTC P0501 - Vehicle Speed Sensor (VSS) Range/ Performance; "... Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. This DTC is set the same way as P0500, however the malfunction indicator lamp (MIL) is not triggered. Refer to possible causes for P0500. Refer to diagnostic aids for P0500..."
Source: by slingblade at The National Lightning Owners Club
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DTC P0501 - Vehicle Speed Sensor (VSS) Range/ Performance; "... Indicates the powertrain control module (PCM) detected an error in the vehicle speed information. This DTC is set the same way as P0500, however the malfunction indicator lamp (MIL) is not triggered. Refer to possible causes for P0500. Refer to diagnostic aids for P0500..."
Source: by slingblade at The National Lightning Owners Club
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DTC P0503 - Vehicle Speed Sensor (VSS) Intermittent; "... Indicates poor or noisy VSS performance. Vehicle speed data is received from either the vehicle speed sensor (VSS), transfer case speed sensor (TCSS), anti-lock brake system (ABS) control module, generic electronic module (GEM), or central timer module (CTM). Noisy VSS/TCSS input signal from Radio Frequency Interference/Electro- Magnetic Interference (RFI/EMI) external sources such as ignition components or charging circuit. Damaged VSS or driven gears. Damaged TCSS. Damaged wiring harness or connectors. Malfunction in module(s) or circuit connected to VSS/TCSS circuit. After market add-on. Monitor VSS PID while driving vehicle, check for intermittent vehicle speed indication. Verify ignition and charging system are functioning Verify ignition and charging system are functioning correctly. Check for good VSS (-) to ground..."
Source: by slingblade at The National Lightning Owners Club
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DTC P1500 - Vehicle Speed Sensor (VSS) Intermittent; "... Indicates the VSS input signal was intermittent. This DTC is set when a VSS fault interferes with other OBDII tests, such as Catalyst efficiency monitor, EVAP monitor, HO2S monitor, etc. Intermittent VSS connections Intermittent open in VSS harness circuit(s) Intermittent short in VSS harness circuit(s) Damaged VSS Damaged PCM..."
Source: by slingblade at The National Lightning Owners Club
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DTC P1501, P1502 - Vehicle Speed Sensor & Possible Causes
Source: by slingblade at The National Lightning Owners Club
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DTC P1703 - Brake Switch Out of Self-Test Range; "... Indicates that during Key On Engine Off (KOEO) Self-Test, BPP signal was high. Or during Key On Engine Running (KOER) Self -Test, the BPP signal did not cycle high and low. Open or short in (BPP) circuit Open or short in stoplamp circuits Damaged PCM Malfunction in module(s) connected to BPP circuit (Rear Electronic Module [REM] Windstar and LS6/LS8 and Lighting Control Module (LCM), Damaged Brake Switch, Misadjusted Brake Switch. Check for proper function of stoplamps. Follow correct Self-Test procedures, refer to Section 2, Quick Test..."
Source: by slingblade at The National Lightning Owners Club
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Fuse 13 Blown, Short Circuits, Common Locations TSB 95-02-11 on 94-95 Bronco & Trucks
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Fuse E Blown, Short Circuits, Common Locations TSB 95-02-11 on 94-95 Bronco & Trucks
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Programmable Speedometer Odometer Module (PSOM) Overview, Calibration, 4WABS, Overhead Console Temperature Sensor Interface, E4OD & 4R70W; "S" in a circle displayed on the right side of the digital odometer above the last number Info & Diagrams
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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PSOM & Odometer Not Working in 93-96,PSOM Continuity Test Through 4WABS Control Module Connector; "...jumper 14 to 21, & 39 to 22..." MIESK5 NOTE; See diagram. I did this on our 96; The 4WABS Control Module was toasted; 2 yard 4WABS Control Modules were also bad; NO RETURNS!
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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PSOM & Odometer Not Working in 93-96, PSOM Continuity Test Through 4WABS Control Module Connector; "...jumper 14 to 21, & 39 to 22..." MIESK5 NOTE; See diagram. I did this on our 96; The 4WABS Control Module was toasted; 2 yard 4WABS Control Modules were also bad; NO RETURNS!
Source: by Steve83 (Steve, That dirty old truck) at fourdoorbronco.com
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PSOM & Odometer Not Working in 93-96, PSOM Continuity Test Through 4WABS Control Module Connector; "...jumper 14 to 21, & 39 to 22..." MIESK5 NOTE; See diagram. I did this on our 96; The 4WABS Control Module was toasted; 2 yard 4WABS Control Modules were also bad; NO RETURNS!
Source: by Steve83 (Steve, That dirty old truck) at FSB
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PSOM & Odometer Not Working in RABS Model Years, 87-92 Bronco and ALL F Series through 96 "...If the RABS module is suspect, simply unplug it...WHEREAS; A failed 4WABS module can interfere with the PSOM & everything on the Gy/Bk circuit, but the RABS module won't..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS (RABS II 87-92) Overview; "...The RABS system is found on all models except the F-Super Duty and 1993-96 Bronco models...." (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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RABS - KELSEY-HAYES RABS Overview (87-92), Faults & Troubleshooting (Rear-wheel, Nonintegral)- The Kelsey-Hayes rear wheel antilock brake system was first used by Ford in 1987 on F series trucks, and was later added to the Ford Ranger, Bronco, Bronco II, Explorer, Aerostar and Econoline vans. Ford calls their version of Kelsey-Hayes EBC2 system "RABS" for Rear-wheel Antilock Brake System."
Source: by Larry C CarleySoftware.com via aa1car.com
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RABS Application Chart, Bronco & Ford; KELSEY-HAYES RABS (Rear-wheel, Nonintegral) 87 to 92
Source: by Larry C CarleySoftware.com via aa1car.com
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RABS Component Location Info in 90-92 Bronco & 90-96 F Series w/Ford Part Numbers
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Component Location Info in an 88 (click NEXT to View more pages)
Source: by Jem270 at SuperMotors.net
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RABS Diagnostic Trouble Codes (DTCs)
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Fading Brake Pedal in 87-88
Source: by Jeff at Indentfix via asashop.org
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RABS Functions Diagram
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Inoperative (dash lights on, etc.); E4OD transmission control switch (TCIL) wiring may be misrouted causing a short in the steering column and a blown # 17 fuse for 92-96 in TSB 92-22-5 for 92 Bronco & all Light Trucks
Source: by miesk5 at FSB
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RABS Inoperative (dash lights on, etc.); E4OD transmission control switch (TCIL) wiring may be misrouted causing a short in the steering column and a blown # 17 fuse for 92-96 in TSB 92-22-5 for 92 Bronco & all Light Trucks
Source: by coaltruck344 at answers.yahoo.com
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RABS Low or Sinking Pedal, Ford; "...Contamination may be holding the dump valve portion of the Anti-
Lock Braking System open, allowing the brake fluid to bypass into the accumulator and create a low or sinking brake pedal..."
Source: by CARDONE® cardone.com
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RABS Module Location in 90-92 Bronco & 90-96 F Series w/Ford Part Numbers
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Module Location pic in a 92; behind the glove box
Source: by Jeremy M (Big 92, jermil01) at SuperMotors.net
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RABS Overview; "...The Rear ABS is what is called an "open" hydraulic system. When an ABS stop is initiated and wheel lock is detected, the isolation or inlet valve closes, preventing any more fluid from going to the rear wheels. Then, if necessary to prevent lockup, an outlet or dump valve opens to bleed fluid out of the rear brake lines. That fluid goes to an accumulator and is held there for the remainder of the stop.In RABS "open" system, if there is a low fluid condition and the red warning light comes on, the ABS electronic control unit will detect this condition, turn the amber ABS warning light on and disable the system. The vehicle operator will still have basic brake system performance, but the benefit of RABS is lost.The reason for disabling the RABS is that the low fluid condition could be caused by a leak in the brake system, decreasing its performance..."
Source: by Ford via Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Overview; miesk5 NOTE: "1987 was the year the rear anti-lock brakes (RABS) were standardized on Broncos; "...Rear-wheel ABS is another type of ABS available on some light trucks. It works in a similar fashion to four-wheel ABS, but monitors and operates only the rear wheels, especially important with light trucks, which often carry heavy loads supported primarily by the rear suspension and wheels..."
Source: by Ford fordvehicles.com
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RABS Self Test & Diagnosis; except 93-96 (does not show self-test...miesk5 note; see other Links here for the self-test process; (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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RABS Self Test & Diagnostic Trouble Codes (DTCs) in Bronco, Explorer & Ford Truck & Van
Source: by Ashton C at rec.autos.makers.ford.explorer
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RABS Self Test & Pin-Point Tests in an 88; PARTIAL, does not incl all Trouble Code (has DTCs 2, 4, 5 & 9 tests); Click NEXT to view all pages; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Jem270 at SuperMotors.net
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RABS Self Test Diagnostic Connector Location pic in a 90; "...It comes out of a large loom under the dash, coming through the firewall, near the parking brake. On mine there are 2 similar connectors in that area, the correct one has only 1 black & orange wire running to it, & was hidden on top of the loom..."
Source: by ElKabong (Ken, El Kabong) at FSB
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RABS Self Test Diagnostic Connector Location pic in a 92; under glove box
Source: by Jeremy M (Big 92, jermil01) at FSB
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RABS Self Test Diagnostic Connector Location pic in a 92; under glove box
Source: by Jeremy M (Big 92, jermil01) at SuperMotors.net
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RABS Self Test Diagnostic Connector Location pic in an 88; "...it is next to the brake pedal which this is a picture of and is C111; It has the one wire that is black/orange.."
Source: by Jem270 at FSB
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RABS Self Test; except 93-96; "...from the 1990 Ford Truck Shop Manual. when Yellow ANTILOCK light is on & Red BRAKE light is off - is on; EXTENSIVE VERSION
Source: by ElKabong (Ken, El Kabong) at FSB
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RABS Self Test; except 93-96; "...The 90 service manual gives a routine to pull RABS codes. When the light comes on, don't turn the truck off before reading the codes. Put it in park, chock both front & rear of the wheels, note whether the red brake light is lit also, then momentarily ground the test connector. The test connector comes out of a large loom under the dash, coming through the firewall, near the parking brake. On mine there are 2 similar connectors in that area, the correct one has only 1 black wire with an orange tracer running to it, & was hidden on top of the loom. The correct one is hanging down on the bottom right of the pic below. After you've grounded & ungrounded the wire, the yellow abs light starts to flash. Count the flashes. It said to not count the 1st series, because it may start in the middle. The last flash of the series is a long flash. Then it repeats over & over, until you turn the key off. Count all of the short flashes & the long one together (So 4 short & 1 long is code #5). If I remember right, it should be a number between 2 & 15 or so. If you follow Steve83's sig link, & then go to his Brakes & Hubs album, he has the code definitions for RABS.."
Source: by ElKabong (Ken, El Kabong) at FSB
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RABS Sensor (also called called VSS or Speed Sensor Ring) Tone Ring Inspection in an 8.8; "...Take off the rear diff cover. Check the Ring Tone gear. It is located on the left hand side of the ring gear. Look to see if any of the teeth have been notched (from debris floating around in the diff.) Usually a spider gear. If the ring tone gear has been notched, it will need to be replaced to fix your speedo reading. Jack it up and rotate the tires to look for the teeth to be notched/broken/bent..."
Source: by Bighibbi at FSB
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RABS Sensor (also called called VSS or Speed Sensor Ring) Tone Ring Removal/Installation w/additional info incorporated by Steve83
Source: by Dave's Bronc 90 (Dave B) at FSB
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RABS Sensor (also called called VSS) Cleaning in a 90 (pics are gone)
Source: by slickerthanyou (bitch) at FSB
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RABS Sensor (also called called VSS) Location & Sensor pic in a 95 8.8
Source: by Broncodell at FSB
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RABS Sensor (also called called VSS) Location pic in an 8.8
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Sensor (also called called VSS) pic & Operational Description & Parameters
Source: by Ryan M (Fireguy50) at fordfuelinjection.com
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RABS Sensor (also called called VSS) pic in a 95 8.8
Source: by Broncodell at SuperMotors.net
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RABS Sensor (also called called VSS) Removal/Installation (rear diff); "...1 bolt holds it. clean around the area first so crap does't fall into your diff housing through the hole. be careful with it, the sensor housing is just plastic, and the magnet inside has wires that run to it. basically once you pull it, you will see it has a little rubber o ring for sealing (and it fits snugly, so if you've never removed it, it might feel like it does not want to come out at first). You can look down into your diff and see that it sits just right on top of a "toner" ring which turns with the carrier. The magnet at the tip is very close to this toothed ring, and the interuption of the magnetic field by the teeth as they pass close to the magnet creates a variable signal, which can be "interpreted" into a speed reference for the computer, tranny, etc..."
Source: by Shadofax (TheJuice, The Juice, Mark Z) at FSB
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RABS Sensor (also called called VSS) Removal/Installation article & depiction
Source: by Chilton via Waltman at FSB
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RABS Sensor (also called called VSS) Removal/Installation article & depiction
Source: by Chilton via Waltman at SuperMotors.net
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RABS Sensor (also called called VSS) Replacement in a 90 (pics are gone)
Source: by slickerthanyou (bitch) at FSB
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RABS Sensor (also called called VSS) Test; "...Rear axle sensor should read 800-1400 Ohms across the pins, and more than 10 Ohms from the metal shell to either pin..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Troubleshooting Flow Chart
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Troubleshooting in 87-92
Source: by ElKabong (Ken, El Kabong) & members at FSB
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RABS Troubleshooting in an 88; click NEXT to View more pages; miesk5 Note; for all Resistance tests, battery needs to be disconnected; remove Negative cable at battery
Source: by Jem270 at SuperMotors.net
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RABS Valve & Yellow Warning Light Location Diagram in 90-92 Bronco & 90-96 F Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Valve pic in 87-92 Bronco & 87-96 F Series
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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RABS Wiring Diagram
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
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Repair Price Estimator, Bronco from 90-96 and other Fords; including labor & parts, shops in area, by Zip Code
Source: by RepairPal
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Sensor, VSS or RABS; Applications, Bronco: "...Pre 85 used a cable-mounted VSS (6 pulses per cable rev) for cruise only; 85-91 used a t-case mounted VSS (6 pulses per cable rev) for cruise and E4OD shifting. The ABS sensor was only used for RABS. The ESOF t-case always had its own dedicated speed sensor in the tailhousing; Miesk5 Note Ford Part Number is 7f293, speed sensor; 92-96 use the ABS sensor (108 pulses per diff rev) in the rear axle (via the ABS module) to feed the PSOM, which then feeds everything else..."
Source: by Steve83 (Steve, That dirty old truck) at FSB
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Sensor, VSS or RABS?; by Bronco1 - "Depending on the year; 1992 + - It's called a RABS sensor, or a DSS (diff speed sensor), or rear axle sensor. At work (Ford dealership, we ask for a rear diff speed sensor. 1991 & older - If we want the one on the transmission or transfer case, we ask for the vehicle speed sensor at the trans or tranfer case."
by MustangGT221 - "On the 92-96s there's no "VSS" in the transfer case or tranny, they did away with that cable operated stuff, and used the rear axle's ABS sensor to double as the "VSS" for 92-96. If you look in my 95 dealership manual, they list a vehicle speed sensor, when you look at what the book says it is, they say it's that ABS sensor in the rear diff, so according to that, 92-96's DO have a VSS, it's just simply the rear ABS sensor which now (on 92-96s) doubles as a speed sensor."
Source: by bronco1 and MustangGT221 at FSB
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Specification Charts & Torque Specification; 87 to 96 (under license from Delmar Publishers, comb of Chilton/Nichols/Delmar & Haynes); some may be incorrect, as reported by Seabronc, thanks Seabronc! NEW SITE URL!!! MUST REGISTER TO VIEW; select year, make, model, engine size and go to appropriate section
Source: by Chilton via AutoZone
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Spindle Cut-Out pic for the ABS Sensor
Source: by Roadkill (The Beast) at SuperMotors.net
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Tire Circumference Differences; "...Uneven tire and rim sizes on a vehicle will result in inaccurate wheel speed information being transmitted to the ABS Control Unit. This faulty information will cause ABS Lock-Out or erratic operation..."
Source: by priorreman.com
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Vehicle Speed Sensor (VSS) Harness & Component Location Diagram, Ford Part Numbers, Depictions, etc. from Ford Workshop Manual in 96 Bronco, F-150, F-250, F-350, F-Super Duty Chassis Cab & Motorhome Chassis; use your Browser's SEARCH (or FIND) function to locate what you seek in each Diagram, such as speed, etc.
Source: by Ford via thedieselstop.com
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Wiring Harness & Component Location Diagram, Ford Part Numbers, Depictions, etc. from Ford Workshop Manual in 96 Bronco, F-150, F-250, F-350, F-Super Duty Chassis Cab & Motorhome Chassis; use your Browser's SEARCH (or FIND) function to locate what you seek in each Diagram, such as Anti-Lock or Brake, etc.
Source: by Ford via thedieselstop.com
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