C1049-RIGHT REAR WHEEL PRESSURE PHASE MONITORING
For a complete wiring diagram, refer to the Wiring Information.
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When Monitored:
During active ABS control.
-
Set Condition:
When the Anti-Lock Brakes Module detects a pressure reduction phase and the following pressure hold phase is too long.
Possible Causes |
|---|
| RIGHT REAR TONE WHEEL DAMAGED |
| WHEEL SPEED SIGNALS SWAPPED |
| RIGHT REAR WSS |
| ANTI-LOCK BRAKES MODULE |
1. COMPARE WHEEL SPEED SENSOR SIGNALS
Make sure brake capability is available
before road testing.
WARNING:
| 1. | With the scan tool, monitor ALL the WSS speeds while an assistant drives the vehicle. |
| 2. | 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 3
No
- Go To 2
2. CHECKING INSIDE WHEEL SPEED
| 1. | 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
- Perform ABS INTERMITTENT CONDITION diagnostic procedure, (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No
- Go To 3
| 1. | Turn the ignition off. |
| 2. | Visually inspect the tone wheel and bearing for damage. |
Were any problems found?
Yes
- Repair as necessary.
- Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No
- Go To 4
4. CHECK WHEEL SPEED SENSOR WIRING
| 1. | 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 the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No
- Go To 5
5. RIGHT REAR WHEEL SPEED SENSOR
| 1. | Replace the Right Rear Wheel Speed Sensor in accordance with the Service Information. |
| 2. | Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure). |
Make sure braking capability is
available before road testing.
CAUTION:
| 3. | 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. |
| 4. | 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 C1049-RIGHT REAR WHEEL PRESSURE PHASE MONITORING reset?
Yes
- Replace the Anti-Lock Brakes Module in accordance with the Service Information.
- Perform the ABS VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Antilock Brake (ABS) - Standard Procedure).
No