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C1014






C1014-LEFT FRONT WHEEL SPEED COMPARATIVE PERFORMANCE





For a complete wiring diagram, refer to the Wiring Information.

NOTE: The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.

- When Monitored:
With the ignition on, no system under voltage or over voltage condition present, no open or shorted wheel speed sensor DTCs set, vehicle not under high acceleration, and vehicle speed greater than 0.

- Set Condition:
This DTC will set if either one wheel is sensed above a predetermined range for 5000 msec while the other wheels are below 20% of maximum velocity of all wheels OR if more than one wheel is sensed at below 20% of maximum velocity of all wheels while at least one wheel is sensed above a predetermined range. The condition must exist for two minutes for this DTC to set.

If the number of missing sensors changes at any update, the fault monitor is reset.





1. DTC IS ACTIVE
1. Ignition on, engine not running.
2. With the scan tool, clear DTCs.
3. Turn the ignition off to the lock position.
4. Ignition on, engine not running.
5. With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- The condition that caused the symptom is currently not present. Inspect the related wiring for a possible intermittent condition. Look for any chafed, pierced, pinched, or partially broken wires.
- Perform the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

2. WHEEL SPEED SENSOR INSPECTION
1. Turn the ignition off to the lock position.
2. Inspect the Wheel Speed Sensor for proper mounting.
3. Inspect the Wheel Speed Sensor harness and connector.
4. Inspect the Wheel Speed Sensor for excessive debris on the sensor.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 3

3. TONE WHEEL DAMAGED/MISSING
1. Inspect the Tone Wheel.

NOTE: The Tone Wheel Teeth should be perfectly square, not bent or nicked.

Were any problems found?

Yes

- Replace the Tone Wheel.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 4

4. EXCESSIVE WHEEL SPEED SENSOR AIR GAP
1. Measure the Wheel Speed Sensor Air Gap.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 5

5. WHEEL BEARING LOOSE/BINDING
1. Inspect the wheel bearings for excessive run out or improper clearance.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 6

6. CHECK (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT VOLTAGE




1. Disconnect the Left Front Wheel Speed Sensor harness connector.
2. Turn the ignition on.
3. Measure the voltage between the (B9) Left Front Wheel Speed Sensor Supply circuit and ground.

Is the voltage above 10 volts?

Yes

- Go To 7

No

- Go To 9

7. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the ABS Module harness connector.
3. Ignition on, engine not running.
4. Measure the voltage of the (B9) Left Front Wheel Speed Sensor Supply circuit at the Left Front Wheel Speed Sensor harness connector.

Is there any voltage present?

Yes

- Repair (B9) Left Front Wheel Speed Sensor Supply circuit for a short to voltage.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 8

8. (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Measure the resistance between the (B8) Left Front Wheel Speed Sensor Signal circuit and ground.

Is the resistance above 5.0 Ohms?

Yes

- Replace the Left Front Wheel Speed Sensor.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Repair the (B8) Left Front Wheel Speed Sensor Signal circuit for a short to ground.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

9. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Measure the resistance between the (B9) Left Front Wheel Speed Sensor Supply circuit and ground.

Is the resistance above 5.0 Ohms?

Yes

- Go To 10

No

- Repair the (B9) Left Front Wheel Speed Sensor Supply circuit for a short to ground.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

10. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT OPEN




1. Measure the resistance of the (B9) Left Front Wheel Speed Sensor Supply circuit between the Left Front Wheel Speed Sensor harness connector and the ABS harness connector.

Is the resistance below 5 Ohms?

Yes

- Go To 11

No

- Repair the open (B9) Left Front Wheel Speed Sensor Supply circuit.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

11. (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT OPEN




1. Measure the resistance of the (B8) Left Front Wheel Speed Sensor Signal circuit between the Left Front Wheel Speed Sensor harness connector and the ABS harness connector.

Is the resistance below 5 Ohms?

Yes

- Go To 12

No

- Repair the open (B8) Left Front Wheel Speed Sensor Signal circuit.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

12. (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (B8) Left Front Wheel Speed Sensor Signal circuit at the Left Front Wheel Speed Sensor harness connector.

Is there any voltage present?

Yes

- Repair the (B8) Left Front Wheel Speed Sensor Signal circuit for a short to voltage.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 13

13. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO THE (B8) LEFT FRONT WHEEL SPEED SENSOR SIGNAL CIRCUIT




1. Turn the ignition off to the lock position.
2. Measure the resistance between the (B9) Left Front Wheel Speed Sensor Supply circuit and the (B8) Left Front Wheel Speed Sensor Signal circuit at the ABS Module harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Repair the (B9) Left Front Wheel Speed Sensor Supply circuit for a short to the (B8) Left Front Wheel Speed Sensor Signal circuit.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Replace the Anti-Lock Brakes Module.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

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