C100A

C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT





For a complete wiring diagram refer to the Wiring Information.

- When Monitored:
With the ignition on.

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





1. VERIFY THE DTC IS ACTIVE

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.

Is the DTC active at this time?

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.
- Refer to the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test

2. CHECK HARNESS 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 ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 3

3. CHECK THE (B9) LEFT FRONT WSS SUPPLY CIRCUIT FOR VOLTAGE




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

Is the voltage above 10 volts?

Yes

- Go To 7

No

- Go To 4

4. CHECK THE (B9) LEFT FRONT WSS SUPPLY CIRCUIT FOR A 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 ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 5

5. CHECK THE (B9) LEFT FRONT WSS SUPPLY CIRCUIT FOR AN OPEN OR HIGH RESISTANCE




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

- Go To 6

No

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

6. CHECK THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT AND (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORTED TOGETHER




1. Remove all jumper wires.
2. Measure the resistance between the (B8) Left Front WSS Signal circuit and the (B9) Left Front WSS Supply circuit.

Is the resistance above 5.0 ohms?

Yes

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

No

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

7. CHECK THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the ABS Module harness connector.
3. Turn the ignition on.
4. 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 ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 8

8. CHECK THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
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

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

No

- Go To 9

9. CHECK THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT FOR AN OPEN OR HIGH RESISTANCE




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 10

No

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

10. CHECK THE (B8) LEFT FRONT WSS SIGNAL CIRCUIT AND (B9) LEFT FRONT WSS SUPPLY CIRCUIT SHORTED TOGETHER




1. Remove all jumper wires.
2. Measure the resistance between the (B8) Left Front WSS Signal circuit and the (B9) Left Front WSS Supply circuit.

Is the resistance above 5.0 ohms?

Yes

- Go To 11

No

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

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

WARNING: To avoid possible serious or fatal injury, check 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.

Does the DTC remain active?

Yes

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

No

- Test Complete.