Deceleration Sensor Diagnostics
NOTE:
During deceleration sensor diagnosis, ABS functions like a standard brake system.
- Ensure battery is fully charged. Turn ignition on. ABS warning light should illuminate, then turn off after 3 seconds. If ABS warning light does not illuminate, check fuse, bulb and wiring harness. See WIRING DIAGRAMS .
- Turn ignition off. Connect a fused jumper wire between DLC1 terminals E1 and Ts. See Figure. Start engine. ABS warning light should flash 4 times per second 3 seconds after engine start.
- To inspect deceleration sensor detection point, slowly raise rear of vehicle and measure height from center of lower body of vehicle to ground. See Fig 1. Verify ABS warning light is off. If ABS warning light is illuminated, inspect deceleration sensor installation. Repair as necessary. If deceleration sensor installation is okay, replace sensor.
- Slowly lower rear of vehicle. Slowly raise front of vehicle and measure height from center of lower body of vehicle to ground. Verify ABS warning light is off. If ABS warning light is illuminated, inspect deceleration sensor installation. Repair as necessary. If deceleration sensor installation is okay, replace sensor.
- Slowly lower vehicle. To inspect deceleration sensor operation, drive vehicle at speeds of 12 MPH or greater. Ensure ABS warning light flashes 4 times per second. Depress brake pedal lightly. ABS warning light should remain flashing with no change in pattern. Release brake pedal.
- Regain vehicle speed and depress brake pedal using moderate force. ABS warning light should remain illuminated steady during braking. Release brake pedal and regain vehicle speed. Depress brake pedal firmly. ABS warning light should alternate between steady illumination and flashing 4 times per second.
- If ABS warning light does not function as described, check deceleration sensor installation. If deceleration sensor installation is okay, replace sensor. Turn engine off. Remove jumper wire from DLC1.