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

TEST D: DTCs C1145, C1155, C1165 AND 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 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


































CAUTION: Touching the connector terminals with hands may cause damage to the sensor.