C1049 Right Rear Wheel Pressure Phase Monitoring

C1049 Right 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.


C1049 Right Rear Wheel Pressure Phase Monitoring

Possible Causes

  • Right rear tone wheel/bearing damaged.
  • Wheel speed signals swapped.
  • Right rear WSS.
  • Antilock Brake System (ABS) Module.


Step by step diagnose C1049 Right 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 right 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. Right rear wheel speed sensor

Replace the right 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 C1047 Right Rear Wheel Pressure Phase Monitoring reset?

YES, replace the Antilock Brake System (ABS) Module. Perform the ABS Verification Test.

NO, test complete for C1049 Right Rear Wheel Pressure Phase Monitoring.

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