C0033

C0033-02-FRONT TONE WHEEL - GENERAL SIGNAL FAILURE

For a complete wiring diagram Refer to the Wiring Information.

- When Monitored:
With the ignition on.

- Set Condition:
When the Anti-Lock Brake Module detects periodic drops of a WSS signal.





1. VERIFY THE DTC IS ACTIVE

NOTE: This DTC must be active for the results of this test to be valid. If DTC C0033-1D is present it must be repaired before continuing.

1. Turn the ignition on.
2. With the scan tool, read DTCs.
3. With the scan tool, read and record Environmental Data to help identify the conditions in which the DTC was set.
4. With the scan tool, erase DTCs.
5. Cycle the ignition switch off then on.

CAUTION: Ensure brake capability is available before road testing.

6. Test drive the vehicle in a straight line to 25 mph (40 km/h).

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

7. 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 25 mph (40 km/h).

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

Yes

- Go To 3

No

- Perform the ABS-INTERMITTENT CONDITION TEST. Testing and Inspection.

3. CHECK FOR IMPROPER RIGHT FRONT TIRE PRESSURE/MISMATCHED TIRES
1. Turn the ignition off.
2. Check and adjust the Right Front Tire pressure.
3. Check and adjust all other tire pressures.
4. Inspect for mismatched tires on vehicle.

Is the Right Front Tire improperly inflated or mismatched tires on vehicle?

Yes

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

No

- Go To 4

4. CHECK THE RIGHT FRONT TONE WHEEL/BEARING FOR DAMAGE

NOTE: Check the tone wheel teeth for missing teeth, cracks, or looseness. Teeth should be perfectly square, not bent, or nicked.

1. Check the Right Front Tone Wheel/Bearing for damage.
2. Check the Right Front Tone Wheel for dirt.

Was the tone wheel dirty?

Yes

- Clean tone wheel and sensor. Clear codes and retest.
- Perform the ABS VERIFICATION TEST ABS Verification Test.

No

- Replace the Right Front Tone Wheel/Bearing.
- Perform ABS VERIFICATION TEST ABS Verification Test.