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C100A






C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT





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

- When Monitored:
With the ignition on and no system under voltage or over voltage condition present.

- Set Condition:
If the measured wheel speed sensor feedback voltage is less than.304 of a volt, the sensor is considered open.

If the measured wheel speed sensor feedback voltage is greater than 1.39 volts, or if a sensor over current condition is detected, the sensor is considered shorted.

If a shorted or open condition is present for more than 100 msec, the DTC will set.





1. DTC IS ACTIVE
1. Turn the ignition of to the lock position.
2. With the scan tool, clear DTCs.
3. Turn the ignition of to the lock position.
4. Ignition on, engine off.
5. With the scan tool, read DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Go To 15

2. WHEEL SPEED SENSOR INSPECTION
1. Turn the ignition of 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. (B9) LEFT FRONT WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO GROUND




1. Turn the ignition off to the lock position.
2. Disconnect the Left Front Wheel Speed Sensor harness connector.
3. Disconnect the ABS harness connector.

NOTE: Check connector - Clean/repair as necessary.

4. 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 7

No

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

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




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

Is the resistance above 5.0 Ohms?

Yes

- Go To 8

No

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

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




1. Measure the resistance of the (B9) Left Front Wheel Speed Sensor Supply circuit.

Is the resistance below 5 Ohms?

Yes

- Go To 9

No

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

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




1. Measure the resistance of the (B8) Left Front Wheel Speed Sensor Signal circuit.

Is the resistance below 5 Ohms?

Yes

- Go To 10

No

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

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




1. Ignition on, engine off.
2. Measure the voltage of the (B9) Left Front Wheel Speed Sensor Supply circuit.

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 11

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




1. Measure the voltage of the (B8) Left Front Wheel Speed Sensor Signal circuit.

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 12

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




1. Turn the ignition of 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 harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Repair (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

- Go To 13

13. LEFT FRONT WHEEL SPEED SENSOR




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

NOTE: The resistance should be approximately 1600-2300 Ohms at 76° F (24.5° C).

Is the resistance within the noted range?

Yes

- Go To 14

No

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

14. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Turn the ignition of to the lock position.
2. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
3. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

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

No

- Replace the Anti-lock Brake System (ABS) Module.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

15. WIRING HARNESS INSPECTION
1. Turn the ignition of to the lock position.

NOTE: Towing the vehicle with ignition ON may set this DTC.

2. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
3. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

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

No

- Test Complete.

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