Test C: DTCs C1145 (RF), C1155 (LF) and C1230 (Rear) - Wheel Speed Sensor Input Circuit Failure

Pinpoint Test C: DTCs C1145 (RF), C1155 (LF) and C1230 (Rear) - Wheel Speed Sensor Input Circuit Failure
Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation
The active wheel speed sensors generate a square wave 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 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.

Voltage and a ground signal are supplied to the wheel speed sensors from the ABS module.
^ DTC C 1145 RF 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, DTC C 1145 will be set.
^ DTC C 1155 LF 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, DTC C 115 5 will be set.
^ DTC C1230 Rear 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, DTC C1230 will be set.

This pinpoint test is intended to diagnose the following:
^ Fuse
^ Wiring, terminals or connectors
^ Wheel speed sensor
^ ABS module

C1-C2:

C3-C4:

C4 (Continued)-C5:

C5 (Continued)-C7:

C7 (Continued)-C9: