C1048 Left Rear Wheel Pressure Phase Monitoring
November 04, 2017
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C1048 Left Rear Wheel Pressure Phase Monitoring - If the Antilock Brake System (ABS) Module detects a pressure reduction phase and the following pressure hold phase is too long.
Possible Causes
- Left rear tone wheel/bearing damaged.
- Wheel speed signals swapped.
- Left rear WSS.
- Antilock Brake System (ABS) Module.
Diagnose code C1048 Left Rear Wheel Pressure Phase Monitoring
Step 1. Compare wheel speed sensor signals
Warning: Make sure 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 rear WSS speed differ from the other WSS speeds by 8 km/h (5 mph) or show no speed?
YES, go to step 3.
NO, go to step 2.
Step 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 that outside.
Was the inside wheel slower than outside?
YES,perform the ABS Intermittent condition.
NO, go to step 3.
Step 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 ben, or nicked. Check the wheel bearing for worn/looseness.
Were any problems found?
YES, repair as necessary.
NO, go to step 4.
Step 4. Check wheel speed sensor wiring
Check the Antilock Brakes System (ABS) Module and wheel speed sensors harness connectors for incorrectly wired connectors.
Were any problems found?
YES, repair as necessary.
NO, go to step 5.
Step 5. Left rear wheel speed sensor
Replace the left rear wheel speed sensor. 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 DTC.
Note: The Antilock Brake System (ABS) Module must sense all 4 wheels at 12 km/h (7.5 mph) before it will extinguish the ABS indicators.
Did DTC C1048 Left Rear Wheel Pressure Phase Monitoring reset?
YES, replace the Antilock Brake System (ABS) Module. Perform the ABS Verification Test.
NO, test complete for DTC C1048 Left Rear Wheel Pressure Phase Monitoring.
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