C1048

C1048-LEFT REAR WHEEL PRESSURE PHASE MONITORING





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

- When Monitored:
During active ABS control.

- Set Condition:
If the Anti-Lock Brake Module detects a pressure reduction phase and the following pressure hold phase is too long.





1. COMPARE WHEEL SPEED SENSOR SIGNALS

WARNING: Make sure brake capability is available before road testing.

1. Using the scan tool, monitor ALL the WSS speeds while an assistant drives the vehicle.
2. Slowly accelerate as straight as possible from a stop to 25 mph (40 km/h).

Does the Left Rear WSS speed differ from the other WSS speeds by 5 mph (8 km/h) or show NO speed?

Yes

- Go To 3

No

- Go To 2

2. CHECKING INSIDE WHEEL SPEED
1. Slowly accelerate as straight as possible from a stop to 25 mph (40 km/h) and perform a 90 degree turn while monitoring if inside wheel is slower than outside.

Was the inside wheel slower than outside?

Yes

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

No

- Go To 3

3. INSPECT TONE WHEEL/BEARING
1. Turn the ignition off.
2. Visually inspect the tone wheel and bearing for damage.
- Check the tone wheel teeth for missing teeth, cracks, and looseness. The teeth must be perfectly square, not bent, or nicked. Check the wheel bearing for worn/looseness.

Were any problems found?

Yes

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

No

- Go To 4

4. CHECK WHEEL SPEED SENSOR WIRING
1. Check the Anti-Lock Brake Module and Wheel Speed Sensors harness connectors for incorrectly wired connectors.

Were any problems found?

Yes

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

No

- Go To 5

5. LEFT REAR WHEEL SPEED SENSOR
1. Replace the Left Rear Wheel Speed Sensor.
2. Perform the ABS VERIFICATION TEST. ABS Verification Test.

CAUTION: Make sure brake capability is available before road testing.

3. Road test the vehicle over 25 mph (40 km/h).

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

4. Using the scan tool, read ABS DTCs.

NOTE: The Anti-Lock Brake Module must sense ALL 4 wheels at 7.5 mph (12 km/h) before it will extinguish the ABS indicators.

Did DTC C1048-LEFT REAR WHEEL PRESSURE PHASE MONITORING reset?

Yes

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

No

- Test complete.