C1046
C1046-LEFT FRONT WHEEL PRESSURE PHASE MONITORING
- 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
- Refer to the ABS-INTERMITTENT CONDITION TEST. Component Tests and General Diagnostics
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.