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Home >> Jeep >> 2007 >> Liberty Limited, RWD >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Instrument Cluster - Electrical Diagnostics >> Instrument Cluster >> DTC Troubleshooting >> Oil Pressure Sensor Faulted Low (BCM) >> Diagnostic Test

Diagnostic Test

  1. 1) OIL SENSOR VOLTAGE BELOW 0.08 OF A VOLT 

    Ignition on, engine not running.

    With a scan tool, read the MAP Sensor voltage.

    Is the voltage below 0.08 of a volt? 

    Yes 

    1. Go To step  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2) (K301) 5-VOLT SUPPLY CIRCUIT 
    Fig 1: Measuring Voltage On 5-Volt Supply Circuit
    GC0046874Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Oil Pressure Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (K301) 5-volt Supply circuit in the Oil Pressure Sensor harness connector.

    Is the voltage between 4.5 to 5.2 volts? 

    Yes 

    1. Go To step  3).

    No 

    1. Go To step  6).
  3. 3) OIL PRESSURE SENSOR 

    With a scan tool, monitor the Oil Pressure Sensor voltage with the Sensor harness connector disconnected.

    Is the voltage above 4.5 volts? 

    Yes 

    1. Replace the Oil Pressure Sensor.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go To step  4).
  4. 4) (K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground And Oil Pressure Sensor Signal Circuit
    GC0046875Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the BCM C2 harness connector.

    Measure the resistance between ground and the (K302) Oil Pressure Sensor Signal circuit in the Oil Pressure Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K302) Oil Pressure Sensor Signal circuit.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go To step  5).
  5. 5) (K302) OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K300) SENSOR GROUND CIRCUIT 
    Fig 3: Measuring Resistance Between Oil Pressure Sensor Signal Circuit And Sensor Ground Circuit
    GC0046876Courtesy of CHRYSLER LLC

    Measure the resistance between the (K302) Oil Pressure Sensor Signal circuit and the (K300) Sensor ground circuit in the Oil Pressure Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short between the (K302) Oil Pressure Sensor Signal circuit and the (K300) Sensor ground circuit.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go To step  6).
  6. 6) (K301) 5-VOLT SUPPLY CIRCUIT OPEN 
    Fig 4: Measuring Resistance Of 5-Volt Supply Circuit
    GC0046877Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the BCM C2 harness connector.

    Measure the resistance of the (K301) 5-volt Supply circuit.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  7).

    No 

    1. Repair the open in the (K301) 5-volt Supply circuit.
    2. Perform BODY VERIFICATION TEST .
  7. 7) (K301) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 5: Measuring Resistance Between Ground And 5-Volt Supply Circuit
    GC0046878Courtesy of CHRYSLER LLC

    Measure the resistance between ground and the (K301) 5-volt Supply circuit in the Oil Pressure Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K301) 5-volt Supply circuit.
    2. Perform BODY VERIFICATION TEST .

    No 

    1. Go To step  8).
  8. 8) BCM 
    NOTE: Before continuing, check the BCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    Were there any problems found? 

    Yes 

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

    No 

    1. Replace and program the BODY Control Module per Service Information.
    2. Perform BODY VERIFICATION TEST .