C1046

C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING

For a complete wiring diagram Consult Diagrams/Electrical.

- 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 3

No

- Go to 2

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

Yes

- Refer to the ABS-INTERMITTENT CONDITION TEST. ABS Intermittent Condition Test

No

- Go to 3

3. 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 4

4. 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 5

5. 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 met.

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.