C1046–LEFT FRONT WHEEL PRESSURE PHASE MONITORING

For a complete wiring diagram Refer to Section 8W.


  • 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.


Possible Causes
 
LEFT FRONT TONE WHEEL/BEARING DAMAGED
 
WHEEL SPEED SIGNALS SWAPPED
 
LEFT FRONT WSS
 
ANTI-LOCK BRAKES MODULE
 




Diagnostic Test

1.COMPARE WHEEL SPEED SENSOR SIGNALS

WARNING: To avoid personal injury or death, check brake capability is available before road testing.





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

2.INSPECT TONE WHEEL/BEARING


  • 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 wear/looseness.


Were any problems found?

Yes


No
  • Go To 3

3.CHECK WHEEL SPEED SENSOR WIRING



Were any problems found?

Yes


No
  • Go To 4

4.LEFT FRONT WHEEL SPEED SENSOR


(Refer to 5 - BRAKES - STANDARD PROCEDURE)

WARNING: To avoid personal injury or death, check brake capability is available before road testing.



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



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


No
  • Test Complete.