Test A: DTCs C1145, C1155 and C1230 - Wheel Speed Sensor Input Circuit Failure

PINPOINT TEST A: DTCs C1145, C1155 AND C1230 - WHEEL SPEED SENSOR INPUT CIRCUIT FAILURE
Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

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

Possible Causes
^ Circuit open
^ Circuit shorted
^ Wheel speed sensor
^ ABS module

A1-A4:

A4-A6:

A6-A7:

A7-A8: