C1046

C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING





For a complete wiring diagram Refer to Diagrams/Electrical. Diagrams By Number


- When Monitored:

During active ABS control.

- Set Condition:

If the Anti-Lock Brakes Module detects a pressure reduction phase and the following pressure hold phase is too long.







Diagnostic Test


1. COMPARE WHEEL SPEED SENSOR SIGNALS

WARNING: Ensure brake capability is available before road testing.

With the scan tool, monitor ALL the WSS speeds while an assistant drives the vehicle.

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

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

Yes

- Go To 2

No

- Perform the ABS Intermittent Condition diagnostic procedure. Testing and Inspection


2. INSPECT TONE WHEEL/BEARING

Turn the ignition off.

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 ABS VERIFICATION TEST. ABS Verification Test

No

- Go To 3


3. CHECK WHEEL SPEED SENSOR WIRING

Check the Anti-Lock Brakes Module and Wheel Speed Sensors harness connectors for incorrectly wired connectors.

Were any problems found?

Yes

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

No

- Go To 4


4. LEFT FRONT WHEEL SPEED SENSOR

Replace the Left Front Wheel Speed Sensor.

Perform ABS VERIFICATION TEST. ABS Verification Test


CAUTION: Ensure brake capability is available before road testing.

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 meet.

With the scan tool, read ABS DTCs.


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

Did DTC C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING reset?

Yes

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

No

- Test Complete.