C003A-2F

C003A-2F-RIGHT REAR WHEEL SPEED SENSOR - SIGNAL ERRATIC





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

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

- Set Condition:
When the Anti-lock Brake System (ABS) Module detects multiple drastic changes in Right Rear wheel speed.





1. VERIFY THE DTC IS ACTIVE

NOTE: If DTC C003A-1D is present, perform the diagnostics for this DTC before continuing with this diagnostic procedure.

1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.

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 DTCs.

Is the DTC active at this time?

Yes

- Go To 3

No

- Go To 2

2. CHECK WHEEL SPEED SENSOR SIGNALS
1. Turn the ignition on.
2. With the scan tool, monitor and graph ALL the WSS speeds and compare graph while an assistant drives the vehicle.

NOTE: If graph shows periodic dropouts pay close attention to the tone wheel.

3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).

Is the Right Rear WSS speed showing 0 km/h (0 mph), not matching other wheels, or showing erratic behavior?

Yes

- Go To 3

No

- Perform ABS INTERMITTENT CONDITION diagnostic procedure. Testing and Inspection.

3. CHECK RIGHT REAR WSS FOR LOOSENESS, INSPECT CIRCUITS/CONNECTORS/TERMINALS FOR DAMAGE

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

1. Turn the ignition off to the lock position.
2. Inspect the ABS Module harness connector and the Right Rear WSS harness connector.
3. Check the Right Rear WSS for looseness, excessive corrosion and not properly fastened.
4. Inspect the (B1) Right Rear WSS Signal and (B2) Right Rear WSS Supply circuits between the Right Rear WSS and Anti-Lock Brake Module for damage.

Is the Right Rear WSS loose or any of the wiring/connectors/terminals damaged?

Yes

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

No

- Go To 4

4. CHECK RIGHT REAR WHEEL SPEED SENSOR FOR DAMAGE
1. Remove the Right Rear Wheel Speed Sensor.
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.

Is the Right Rear Wheel Speed Sensor damaged?

Yes

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

No

- Go To 5

5. CHECK RIGHT REAR WHEEL BEARING AND HUB OR ENCODER FOR DAMAGE
1. Inspect the Right Rear wheel bearing, hub and Encoder for excessive runout, clearance or damage.

NOTE: Refer to the appropriate service information, if necessary, for procedures or specifications.

Is the Right Rear Wheel Bearing, Hub or Encoder Damaged?

Yes

- Replace the Hub and Wheel Bearing. Rear Hub And Bearing - Removal
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 6

6. RIGHT REAR WHEEL SPEED SENSOR
1. Replace the Right Rear Wheel Speed Sensor. Front.
2. Perform the ABS VERIFICATION TEST. ABS Verification Test
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 Brakes Module. Anti-Lock Brake System Module - Removal.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Test Complete.