Wheel Sensor Signal Failure

Test 1 - 3:

Test 4 - 7:

SYMPTOM LIST:
LEFT FRONT WHEEL SPEED / SIGNAL FAILURE
LEFT REAR WHEEL SPEED / SIGNAL FAILURE
RIGHT FRONT WHEEL SPEED / SIGNAL FAILURE
RIGHT REAR WHEEL SPEED / SIGNAL FAILURE

TEST NOTE:
All symptoms listed above are diagnosed using the same tests. The title for the tests will be "left front sensor circuit failure".

WHEN MONITORED:
Ignition on. Wheel speed is checked and verified at drive off and continuously thereafter.

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 Diagnostic Trouble Code (DTC) is set. The DTC can also set if the signal is missing or erratic.

POSSIBLE CAUSES:
- WHEEL SPEED SIGNAL FAILURE DTC PRESENT
- AFFECTED WHEEL SPEED SENSOR SIGNAL INOPERATIVE
- AFFECTED WHEEL SPEED SENSOR CONNECTOR DAMAGED
- AFFECTED WHEEL SPEED SENSOR TONE WHEEL DAMAGED
- AFFECTED WHEEL SPEED SENSOR AIR GAP FAULT
- WHEEL BEARING FAULT
- BRAKE LINING FAULT
- AFFECTED WHEEL SPEED SENSOR CIRCUIT ELECTRICAL FAULT