27 - Intermittent Signal From Left Front Sensor

Test 1-2:

Test 3-6:

Test 7-10:

Test 11-15:

Symptom List
INTERMITTENT SIGNAL FROM LEFT FRONT SENSOR - 27
INTERMITTENT SIGNAL FROM REAR SENSOR - 37
INTERMITTENT SIGNAL FROM RIGHT FRONT SENSOR - 23
LEFT FRONT SENSOR OPEN - 25
LEFT FRONT SENSOR SHORTED - 90
NO SIGNAL FROM LEFT FRONT SENSOR - 26
NO SIGNAL FROM REAR SENSOR - 36
NO SIGNAL FROM RIGHT FRONT SENSOR - 22
REAR SENSOR OPEN - 35
REAR SENSOR SHORTED - 93
RIGHT FRONT SENSOR OPEN - 21
RIGHT FRONT SENSOR SHORTED - 91

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 - 27.

INTERMITTENT SIGNAL FROM LEFT FRONT SENSOR - 27

When Monitored
Ignition turned on for at least 3.6 seconds. Average filtered speed for the two front wheels above 6 km/h (4 mph). Speed for each suspect sensor above 32 km/h (20 mph) (brake applied or ABS active) or 19 km/h (12 mph) (brake released or ABS inactive).

Set Condition
When there is a sudden change of output signal from the sensor.

INTERMITTENT SIGNAL FROM REAR SENSOR - 37

When Monitored
Ignition turned on for at least 3.6 seconds. Average filtered speed for the wheels above 19 km/h (12 mph) (brake released or ABS inactive) or 32 km/h (20 mph) (brake applied or ABS active).

Set Condition
When there is a sudden change of output signal from the sensor.

INTERMITTENT SIGNAL FROM RIGHT FRONT SENSOR - 23

When Monitored
Ignition turned on for at least 3.6 seconds. Average filtered speed for the two front wheels above 6 km/h (4 mph). Speed for each suspect sensor above 32 km/h (20 mph) (brake applied or ABS active) or 19 km/h (12 mph) (brake released or ABS inactive).

Set Condition
When there is a sudden change of output signal from the sensor.

LEFT FRONT SENSOR OPEN - 25

When Monitored
Ignition on.

Set Condition
When the CAB detects an open wheel speed sensor circuit.

LEFT FROND SENSOR SHORTED - 90

When Monitored
Ignition on.

Set Condition
When no output signal and continuously excessive sensor resistance is detected.

NO SIGNAL FROM LEFT FRONT SENSOR - 26

When Monitored
Ignition on.

Set Condition
When one sensors signal is prevented above 4 mph while one or more other sensors are indicating that the vehicle is moving above 8 mph.

NO SIGNAL FROM REAR SENSOR - 36

When Monitored
Ignition on.

Set Condition
When one sensors signal is prevented above 4 mph while one or more other sensors are indicating that the vehicle is moving above 8 mph.

NO SIGNAL FROM RIGHT FRONT SENSOR - 22

When Monitored
Ignition on.

Set Condition
When one sensors signal is prevented above 4 mph while one or more other sensors are indicating that the vehicle is moving above 8 mph.

REAR SENSOR OPEN - 35

When Monitored
Ignition on.

Set Condition
When the CAB detects an open wheel speed sensor circuit.

REAR SENSOR SHORTED - 93

When Monitored
Ignition on.

Set Condition
When no output signal and continuously excessive sensor resistance is detected.

RIGHT FRONT SENSOR OPEN - 21

When Monitored
Ignition on.

Set Condition
When the CAB detects an open wheel speed sensor circuit.

RIGHT FRONT SENSOR SHORTED - 91

When Monitored
Ignition on.

Set Condition
When no output signal and continuously excessive sensor resistance is detected.

POSSIBLE CAUSES
- WHEEL SPEED SENSOR OR CONNECTOR DAMAGE, LOOSENESS OR METAL CHIPS
- INTERMITTENT DTC-TOWING WITH IGNITION ON
- WHEEL SPEED SENSOR CIRCUIT SHORTED TO GROUND
- WHEEL SPEED SENSOR CIRCUIT SHORTED TO GROUND
- WHEEL SPEED SENSOR SHORTED TO GROUND
- CAB - INTERNAL SHORT OR OPEN
- WHEEL SPEED SENSOR CIRCUIT OPEN
- WHEEL SPEED SENSOR CIRCUIT OPEN
- WHEEL SPEED SENSOR CIRCUIT SHORTED TO VOLTAGE
- WHEEL SPEED SENSOR CIRCUIT SHORTED TO VOLTAGE
- WHEEL SPEED SENSOR CIRCUITS SHORT TOGETHER
- TONE WHEEL DAMAGED/MISSING
- EXCESSIVE WHEEL SPEED SENSOR AIR GAP
- WHEEL BEARING LOOSE/BINDING
- WHEEL SPEED SENSOR RESISTANCE OUT OF SPECIFICATION