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Home >> Jeep >> 2021 >> Compass Trailhawk >> Repair and Diagnosis (Single Page) >> Brakes >> Traction Control >> Antilock Brake System (Abs) - Verification Test, Intermittent Condition And EPB Verification Test >> Standard Procedure >> Abs Verification Test >> Diagnostic Test

Diagnostic Test

ABS VERIFICATION TEST 

WARNING:

To avoid possible serious or fatal injury, check brake capability is available before road testing.

  1. Turn the ignition off.
  2. Connect all previously disconnected components and connectors.
  3. Verify all accessories are turned off and the battery is fully charged.
    NOTE:

    If the BCM PROXI is not performed, the ABS indicator will illuminate continuously.

  4. The Body Control Module (BCM) PROXI Configuration Alignment routine must be performed first if any of the following components were replaced:For the Body Control Module (BCM) PROXI Configuration Alignment procedure. Refer to STANDARD PROCEDURE .
  5. Perform the correct routines using the scan tool under "Miscellaneous Functions" with the wheels pointing straight ahead on level ground:
    NOTE:

    Make sure the rear Electric Park Brake (EPB) Actuators are disengaged.

    Component Routines
    Anti-lock Brake System (ABS) Module Longitudinal G-Sensor Calibration/ABS Valve Calibration/Steering Angle Sensor Calibration/Service Procedures-Exit In Plant Mode
    Hydraulic Control Unit (HCU) Bleed Brake Procedure/ABS Valve Calibration/Pressure Sensor Calibration
    Integrated Control Unit (ICU) Longitudinal G-Sensor Calibration/ABS Valve Calibration/Pressure Sensor Calibration/Steering Angle Sensor Calibration/Service Procedures-Assembly Check/Service Procedures-Exit In Plant Mode
    Dynamics Sensor/Occupant Restraints Controller (ORC) Initialize ORC in the ORC/Longitudinal G-Sensor in the ABS Module
    Electric Power Steering (EPS) Module/Steering Gear Steering Angle Sensor Calibration
    Wheel Speed Sensor (WSS) Test drive the vehicle at a speed above 40 km/h (25 mph) for several minutes
  6. Verify that the ignition is on, with the scan tool, erase all Diagnostic Trouble Codes (DTCs) from All modules. Start the engine and allow it to run for two minutes and fully operate the system that was indicating the failure.
  7. Turn the ignition off and wait five seconds. Turn the ignition on and using the scan tool, read DTCs from all modules.
  8. If any Diagnostic Trouble Codes are present, and perform the diagnostic procedure. Refer to DTC TROUBLESHOOTING .
  9. NOTE: For Sensor Signal Plausibility and Pump Motor faults, the ABS Module must verify that the failure conditions are no longer present in the current ignition cycle before it can turn off the failure lamp(s). This may require the vehicle to be driven for several minutes above 40 km/h (25 mph). Once it has been determined that the failure condition is no longer present the lamp(s) will be turned off. 
  10. If there are no DTCs present after turning ignition on, road test the vehicle for at least five minutes.
    • Slowly turn the steering wheel from stop to stop.
    • Test drive the vehicle by turning the vehicle left or right in a curving manner at a speeds between 10 and 25 km/h (6 and 15 mph).
  11. Again, with the scan tool read DTCs. If any DTCs are present, for the diagnostic procedure and troubleshoot the new or recurring DTC. Refer to DTC TROUBLESHOOTING .
  12. If there are no Diagnostic Trouble Codes (DTCs) present, and the customer's concern can no longer be duplicated, the repair is complete.

    Are any DTCs present or is the original concern still present?

    Yes 

    • Repair is not complete, perform the appropriate diagnostic procedure. Refer to DTC TROUBLESHOOTING .

    No 

    • Repair is complete.
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