C003B

C003B-29-WHEEL SPEED COMPARATIVE - INVALID SIGNAL





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

- When Monitored:
With the ignition on and vehicle speed above 15 km/h (9 mph) driving straight with no braking.

- Set Condition:
This DTC will set when one or more wheel speed sensor speeds constantly shows a speed that is 25% lower then any of the other wheel speed sensor speeds.





NOTE: Repair all other wheel speed sensor DTCs first before continuing with this diagnostic procedure.

1. VERIFY DTC IS ACTIVE

NOTE: Inspect the tires for improper air pressure and or mismatched tires before continuing, repair as necessary.

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).
4. With the scan tool, read DTCs.

Is the DTC active?

Yes

- Go To 2

No

- Perform the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

2. CHECK WHEEL SPEED SENSOR SIGNALS
1. Turn the ignition on.
2. With the scan tool, monitor and graph ALL the Wheel Speed Sensors speeds and compare.
3. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).

Is one or more of the WSS speeds showing 0 km/h (0 mph) or not matching the other WSS speeds?

Yes

- Go To 3

No

- Perform the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test.

3. INSPECT WHEEL SPEED SENSOR FOR DAMAGE

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

1. Turn the ignition off.
2. Inspect each WSS for looseness and or not properly fastened.

Are any 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 EACH HUB AND WHEEL BEARING FOR DAMAGE
1. Turn the ignition off.
2. Inspect each Hub and Wheel Bearing for damage, corrosion, cracks, looseness, or improper installation.

Are any of the Hub and or Wheel Bearings damaged?

Yes

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

No

- Go To 5

5. ANTI-LOCK BRAKE SYSTEM (ABS) MODULE
1. Replace the Wheel Speed Sensor. Front.
2. Perform the ABS VERIFICATION TEST. ABS Verification Test.
3. With the scan tool, monitor and graph ALL the Wheel Speed Sensors speeds and compare.
4. Slowly accelerate as straight as possible from a stop to 40 km/h (25 mph).
5. With the scan tool, read the DTCs.

Does this DTC remain active?

Yes

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

No

- Test complete.