Antilock Brake System (ABS): 1131

1131-RIGHT REAR WHEEL SPEED SENSOR ERRATIC SIGNAL





When Monitored and Set Condition
^ When Monitored: The Controller Antilock Brake (CAB) monitors the wheel speed circuit every 7 milliseconds (ms).
^ Set Condition: The Controller Antilock Brake (CAB) will set this DTC if the speed signal is missing or erratic.

POSSIBLE CAUSES
- DEFECTIVE WHEEL SPEED SENSOR
- MISSING SENSOR OR TONE WHEEL
- EXCESSIVE AIR GAP
- INCORRECT NUMBER OF TEETH ON TONE WHEEL

For a complete Antilock Brake System (ABS) Circuit Diagram, (Refer to - BRAKES/ELECTRICAL - SCHEMATICS AND DIAGRAMS).

1. VISUALLY INSPECT COMPONENTS FOR DAMAGE AND CORRECT INSTALLATION
Visually inspect the related wiring harness and connectors. Look for any chafed, pierced, pinched, or partially broken wires. Look for broken, bent, pushed out, or corroded terminals. Visually inspect the Right Rear Wheel Speed Sensor, connector and tone wheel for damage and correct installation.
Are there any visible Sensor, connector or tone wheel concerns?
Yes >> Correct the sensor, connector or tone wheel concerns as necessary. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Go to 2

2. MONITOR ALL WHEEL SPEED SENSORS WITH THE DRBIII





With the DRBIII, erase DTCs.
Start the engine.
With an assistant to drive, use the DRBIII to monitor all wheel speed sensors. Slowly accelerate as straight as possible from a stop to 24 km/h (15 MPH).
Is the Right Rear Wheel Speed Sensor Signal 0 or differing from others by more than 5 km/h (3 MPH)?
Yes >> Replace the Right Rear Wheel Speed Sensor. Perform ABS VERIFICATION TEST. ABS Verification Test
No >> Inspect and repair the related wiring harness for a possible intermittent condition. Perform ABS VERIFICATION TEST. ABS Verification Test