D: C1145, C1155, C1165, C1175 - Wheel Speed Sensor Input Circuit Failure

Pinpoint Test D: DTCs C1145, C1155, C1165, AMD C1175 - Wheel Speed Sensor Input Circuit Failure

Normal Operation

Active wheel speed sensors generate a square wave signal that is sent to the anti-lock brake system (ABS) module. The wheel speed sensor circuitry connects to the ABS module connector C135 through 2 wires and a connector at each wheel speed sensor. When the ignition switch is turned to the RUN position, the ABS module carries out a self-test by sending a reference voltage through the wheel speed sensors and their circuitry to determine if they are functional.

Battery voltage is supplied to the active wheel speed sensors from the ABS module. The wheel speed sensor ground is supplied by the ABS module.

Possible Causes

- wheel speed sensor ring (part of the hub and bearing assembly)
- wheel speed sensors
- circuit 514 (YE/RD) open, short to power, or short to ground
- circuit 516 (YE/BK) open, short to power, or short to ground
- circuit 518 (LG/RD) open, short to power, or short to ground
- circuit 519 (LG/BK) open, short to power, or short to ground
- circuit 521 (TN/OG) open, short to power, or short to ground
- circuit 522 (TN/BK) open, short to power, or short to ground
- circuit 523 (RD/PK) open, short to power, or short to ground
- circuit 524 (PK/BK) open, short to power, or short to ground
- ABS module

Notice: Use the Flex Probe kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

Note: If the ignition key is turned to the ON position when one or more wheel speed sensors are disconnected, the ABS module will disable the output to that sensor. Make sure all test connections are made at the wheel speed sensor connectors before turning the ignition key to the ON position.