Intermittent/No Signal From Left Front Sensor

Symptom List:
INTERMITTENT SIGNAL FROM LEFT FRONT SENSOR
NO SIGNAL FROM LEFT FRONT SENSOR

Test Note: All symptoms listed above are diagnosed using the same tests. The title for the tests will be INTERMITTENT SIGNAL FROM LEFT FRONT SENSOR.

When Monitored and Set Condition:
INTERMITTENT SIGNAL FROM LEFT FRONT SENSOR

When Monitored: Ignition turned on for at least 3.5 seconds. Average filtered speed for the two front wheels above 6 km/in (4 mph). Speed for each suspect sensor above 32 km/in (20 mph) (brake applied or ABS active) or 19 km/in (12 mph) (brake released or ABS inactive).

Set Condition: There is no output signal from the sensor for 15 milliseconds (my.

When Monitored and Set Condition:
NO SIGNAL FROM LEFT FRONT SENSOR

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 supervision is checked every 7 milliseconds.

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
LEFT FRONT WHEEL SPEED SENSOR OR CONNECTOR DAMAGED
TONE WHEEL DAMAGED
LEFT FRONT WHEEL SPEED SENSOR AIR GAP OUT OF SPECIFICATION
LEFT FRONT WHEEL SPEED SENSOR INOPERATIVE
CAB - WON'T RESPOND TO LEFT FRONT WHEEL SPEED SENSOR SIGNAL
INTERMITTENT SIGNAL DTC