Normal Operation and Fault Conditions

Active wheel speed sensors generate a square wave signal proportional to wheel speed which is sent to the ABS module. Each wheel speed sensor is connected to the ABS module through 2 wires and a connector at each wheel speed sensor. One wire is for sensor voltage supply from the ABS module and the other wire is for the signal return to the ABS module. When the ignition mode is set to ON, the ABS module carries out a self-test by sending a reference voltage through the wheel speed sensors and their circuitry.

PPT M ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC	Description	Fault Trigger Conditions
C0031:01	Left Front Wheel Speed Sensor: General Electrical Failure	Sets when the ABS module does not receive a signal from the wheel speed sensor.
C0034:01	Right Front Wheel Speed Sensor: General Electrical Failure	Sets when the ABS module does not receive a signal from the wheel speed sensor.
C0031:11	Left Front Wheel Speed Sensor: Circuit Short to Ground	Sets when the ABS module detects a short to ground from the sensor signal return circuit or if the sensor has an internal short to ground.
C0034:11	Right Front Wheel Speed Sensor: Circuit Short to Ground	Sets when the ABS module detects a short to ground from the sensor signal return circuit or if the sensor has an internal short to ground.
C0031:12	Left Front Wheel Speed Sensor: Circuit Short to Battery	Sets when the ABS module detects a short to voltage from the sensor signal return circuit. A short to voltage may be due to the sensor signal return and sensor voltage supply circuits shorted together or a short internal to the sensor itself.
C0034:12	Right Front Wheel Speed Sensor: Circuit Short to Battery	Sets when the ABS module detects a short to voltage from the sensor signal return circuit. A short to voltage may be due to the sensor signal return and sensor voltage supply circuits shorted together or a short internal to the sensor itself.
C0031:14	Left Front Wheel Speed Sensor: Circuit Short to Ground or Open	Sets when the ABS module detects a short to ground or an open from the sensor signal return circuit or if the sensor has an internal short to ground or open.
C0034:14	Right Front Wheel Speed Sensor: Circuit Short to Ground or Open	Sets when the ABS module detects a short to ground or an open from the sensor signal return circuit or if the sensor has an internal short to ground or open.