C100A

C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the ignition on.

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





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.

Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition switch from off to on.
With the scan tool, read DTCs.
Does the scan tool display: C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT active?

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 CONNECTOR/TERMINAL FOR DAMAGE

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

Turn the ignition off.
Inspect the Anti-Lock Brake 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 (B9) LEFT FRONT WSS SUPPLY CIRCUIT VOLTAGE




Disconnect the Left Front WSS harness connector.
Turn the ignition on.
Measure the voltage between the (B9) Left Front WSS Supply circuit and ground.
Is the voltage above 10 volts?

Yes

- Go to 6

No

- Go to 4

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




Disconnect the Anti-Lock Brake Module harness connector.
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 (B9) LEFT FRONT WSS SUPPLY CIRCUIT OPEN




Connect a jumper wire between ground and the (B9) Left Front WSS Supply circuit in the Anti-Lock Brakes Module harness connector.
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.
- Perform ABS VERIFICATION TEST. ABS Verification Test.

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




Turn the ignition on.
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 7

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




Turn the ignition off.
If not done previously, disconnect the Anti-Lock Brake Module harness connector.
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 8

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




Connect a jumper wire between ground and the (B8) Left Front WSS Signal circuit in the Anti-Lock Brakes Module harness connector.
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 9

No

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

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




Remove all jumper wires.
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 10

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.

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

WARNING: To avoid personal injury or death, check brake capability is available before road testing.

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.

With the scan tool, read ABS DTCs.
Did DTC C100A-LEFT FRONT WHEEL SPEED SENSOR CIRCUIT reset?

Yes

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

No

- Test Complete.