Normal Operation and Fault Conditions

WARNING: This page is about a different car, the 2018 Lincoln Navigator. However, it is still accessible from the selected car via links, so may be relevant.

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. The 2 circuits provide both sensor power and sensor signal return. 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.
C0031:12	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.
C0032:11	Left Front Wheel Speed Sensor Supply: Circuit Short to Ground	Sets when the ABS module detects a short to ground on the sensor signal voltage supply circuit.
C0035:11	Right Front Wheel Speed Sensor Supply: Circuit Short to Ground	Sets when the ABS module detects a short to ground on the sensor signal voltage supply circuit.