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HOMESERVICE MANUALSJEEP2008PATRIOT LIMITED, FWD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM - ELECTRICAL DIAGNOSTICSABS ELECTRICAL DIAGNOSTICSDTC TROUBLESHOOTINGC1048-LEFT REAR WHEEL PRESSURE PHASE MONITORINGDIAGNOSTIC TEST
2008 Jeep Patriot Limited, FWD, Standard

Diagnostic Test

2008 Jeep Patriot Limited, FWD, StandardSECTION Diagnostic Test
  1. COMPARE WHEEL SPEED SENSOR SIGNALS 
    WARNING: Ensure 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 

    1. Go To  3.

    No 

    1. Go To  2.
  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 than outside.

    Was the inside wheel slower than outside? 

    Yes 

    1. Refer to the ABS-INTERMITTENT CONDITION  test.

    No 

    1. Go To  3.
  3. INSPECT TONE WHEEL/BEARING 

    Turn the ignition off.

    Visually inspect the tone wheel and bearing for damage.

    1. 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 worn/looseness.

    Were any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform ABS VERIFICATION TEST .

    No 

    1. Go To  4.
  4. CHECK WHEEL SPEED SENSOR WIRING 

    Check the Anti-Lock Brakes Module and Wheel Speed Sensors harness connectors for incorrectly wired connectors.

    Were any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform ABS VERIFICATION TEST .

    No 

    1. Go To  5.
  5. LEFT REAR WHEEL SPEED SENSOR 

    Replace the Left Rear Wheel Speed Sensor in accordance with the Service Information.

    Perform ABS VERIFICATION TEST .

    CAUTION: Ensure brake capability is available before road testing.

    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 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 C1048-LEFT REAR WHEEL PRESSURE PHASE MONITORING reset? 

    Yes 

    1. Replace the Anti-Lock Brakes Module in accordance with the Service Information.
    2. Perform ABS VERIFICATION TEST .

    No 

    1. Test Complete.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.