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Symptom: LEFT FRONT SENSOR SIGNAL FAILURE When Monitored and Set Condition: LEFT FRONT SENSOR SIGNAL FAILURE When Monitored: Wheel speed comparison is checked at drive off or every 7 milliseconds (ms). Sensor circuit continuity is checked every 7 milliseconds. Wheel speed phase length Set Condition: If, during an ABS stop, the CAB commands any valve solenoid on for an extended length of time, and does not see a corresponding wheel speed change, the POSSIBLE CAUSES BOTH LEFT FRONT WHEEL SPEED SENSOR CIRCUIT AND SIGNAL DTC CONDITIONS LEFT FRONT WHEEL SPEED SENSOR OR CONNECTOR DAMAGED TONE WHEEL DAMAGED LEFT FRONT WHEEL SPEED SENSOR AIR GAP OUT OF SPECIFICATION LEFT FRONT WHEEL BEARING OUT OF SPECIFICATION LEFT FRONT WHEEL SPEED SENSOR INOPERATIVE CAB - WON’T RESPOND TO LEFT FRONT WHEEL SPEED SENSOR SIGNAL INTERMITTENT SIGNAL DTC TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read DTC’s. Are both Left Front Sensor Signal Failure and Left Front Sensor Circuit Failure All Yes → Refer to symptom Left Front Sensor Circuit Failure in the No → 2 Turn the ignition on. t, monitor the Left Front Wheel Speed Sensor while an assistant drives the vehicle. t, monitor all wheel speed sensors. Is Left Front WSS Signal 0 Km/h (0 Mph) or differing from others by more than 5kmh All Yes → No → 23 BRAKES (CAB) |