C1043

C1043-LEFT REAR TONE WHEEL PERFORMANCE

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. CHECK FOR A DTC C1043-LEFT REAR TONE WHEEL PERFORMANCE

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, 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: Make sure 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.

Does the scan tool display: C1043-LEFT REAR TONE WHEEL PERFORMANCE?

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 Left Rear WSS speed showing 0 km/h (0 mph) or not matching other wheels or showing erratic behavior?

Yes

- Go To 3

No

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

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

Is the Left Rear Tire improperly inflated or mismatched tires on vehicle?

Yes

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

No

- Go To 4

4. CHECK AXLE SHAFT FASTENER HARDWARE FOR LOOSENESS
1. Inspect the axle shaft fastener for looseness, and not properly fastened. Tighten fastener to proper specification as required.

Was the Axle Shaft fastener loose?

Yes

- Repair as necessary.

No

- Go To 5

5. CHECK THE LEFT REAR TONE WHEEL 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 Left Rear Tone Wheel for damage.
2. Check the Left Rear Tone Wheel for dirt.

Was the tone wheel dirty?

Yes

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

No

- Replace the Left Rear Tone Wheel.
- Perform ABS VERIFICATION TEST ABS Verification Test.