Test C: DTC C1296 [LF), DTC C1297 (RF), DTC 98 C12 (RR), DTC C1299 (LR) - Wheel Speed Sensor Input Signal Missing

Pinpoint Test C: DTC C1296 (LF), DTC C1297 (RF), DTC C1298 (RR), DTC C1299 (LR) Wheel Speed Sensor Input Signal Missing
Refer to Vehicle/Diagrams, Vehicle Dynamic Systems for schematic and connector information.

Normal Operation
The wheel speed sensor generates a square wave signal that is sent to the 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 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. Power and ground are supplied to the wheel speed sensors from the ABS module.

The front wheel speed sensors are integral to the wheel hub and bearing assembly and have a serviceable jumper harness connecting the sensor to the main wire harness.





This pinpoint test is intended to diagnose the following:
^ Front wheel speed sensor jumper harness
^ Wheel speed sensor
^ Wheel speed tone ring
^ ABS module

C1-C4:

C4 (Continued)-C6: