Normal Operation

Active wheel speed sensors generate a square wave current signal that is sent to the 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 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 and ground are supplied to the active wheel speed sensors from the ABS module.

DTC DESCRIPTION

DTC Description	Fault Trigger Condition
C1145 RF Wheel Speed Sensor Input Circuit Failure C1155 LF Wheel Speed Sensor Input Circuit Failure C1165 RR Wheel Speed Sensor Input Circuit Failure C1175 LR Wheel Speed Sensor Input Circuit Failure	When the vehicle speed exceeds 5 km/h (3 mph), if the ABS module detects an open, short to ground or voltage or a defective wheel speed sensor input circuit, the appropriate DTC will be set.

This pinpoint test is intended to diagnose the following:

Wheel speed sensor ring (part of the hub and bearing assembly)
Wheel speed sensors
Wiring, terminals or connectors
ABS module