C100A

C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT





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.

- Set Condition:
When the Left Front Wheel Speed Sensor (WSS) circuit fails the diagnostic test.





1. CHECK FOR DTC C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT

NOTE: This DTC must be active for the results of this test to be valid.

1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition switch from off to on.
4. With the scan tool, read DTCs.

Does the scan tool display: C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT?

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 ABS INTERMITTENT CONDITION diagnostic procedure. ABS Intermittent Condition Test.

2. CHECK CONNECTOR/TERMINAL FOR DAMAGE

NOTE: Check all terminals for broken, bent, pushed out, or corroded terminals.

1. Turn the ignition off.
2. Inspect the ABS Module harness connector, Left Front WSS, and Left Front WSS harness connector.

Is the Left Front WSS or any of the connectors/terminals damaged?

Yes

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

No

- Go To 3

3. CHECK (B9) LEFT FRONT WSS 12 VOLT SUPPLY CIRCUIT VOLTAGE




1. Disconnect the Left Front WSS harness connector.
2. Turn the ignition on.
3. Measure the voltage of the (B9) Left Front WSS 12 Volt Supply circuit.

Is the voltage above 10.0 volts?

Yes

- Go To 6

No

- Go To 4

4. CHECK (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Using a 12-volt test light connected to 12-volts, probe the (B9) Left Front WSS Supply circuit.

Does the test light illuminate brightly?

Yes

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

No

- Go To 5

5. CHECK (B9) LEFT FRONT WSS SUPPLY CIRCUIT OPEN




1. Connect a jumper wire between ground and the (B9) Left Front WSS Supply circuit in the ABS Module harness connector.
2. Using a 12-volt test light connected to 12-volts, probe the (B9) Left Front WSS Supply circuit.

Does the test light illuminate brightly?

Yes

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

No

- Repair the (B9) Left Front WSS Supply circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

6. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Using a 12-volt test light connected to 12-volts, probe the (B8) Left Front WSS Signal circuit.

Does the test light illuminate brightly?

Yes

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

No

- Go To 7

7. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT OPEN




1. Connect a jumper wire between ground and the (B8) Left Front WSS Signal circuit in the ABS Module harness connector.
2. Using a 12-volt test light connected to 12-volts, probe the (B8) Left Front WSS Signal circuit.

Does the test light illuminate brightly?

Yes

- Go To 8

No

- Repair the (B8) Left Front WSS Signal circuit for an open.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

8. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT SHORT TO VOLTAGE




1. Turn the ignition on.
2. Remove all jumper wires.
3. Measure the voltage between the (B8) Left Front WSS Signal circuit and ground.

Is the voltage above one volt?

Yes

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

No

- Go To 9

9. CHECK (B8) LEFT FRONT WSS SIGNAL CIRCUIT AND (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORT TOGETHER




1. Turn the ignition off.
2. Measure the resistance between the (B8) Left Front WSS Signal circuit and the (B9) Left Front WSS Supply circuit.

Is the resistance above 120 Ohms?

Yes

- Go To 10

No

- Repair the (B8) Left Front WSS Signal circuit and the (B9) Left Front WSS Supply circuit for a short together.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

10. LEFT FRONT WHEEL SPEED SENSOR
1. Replace the Left Front Wheel Speed Sensor.
2. Perform the ABS VERIFICATION TEST. ABS Verification Test.

CAUTION: Make sure brake capability is available before road testing.

3. Road test the vehicle over 40 km/h (25 mph).

NOTE: Vehicle must be driven above 40 km/h (25 mph) for set conditions to be met.

4. With the scan tool, read ABS DTCs.

Did DTC C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT reset?

Yes

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

No

- Test Complete.