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Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  ACTIVE DTC 
    NOTE: Make sure that the engine oil is at the proper level. Also, check the customers oil change history to ensure that the oil is being changed at the correct intervals and that the proper oil viscosity is being used.

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go To step  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2)  ENGINE OIL/ENGINE MECHANICAL 
    NOTE: The following items must be considered before determining the cause of this DTC. Failure to do so may lead to misdiagnosis.
    1. ENGINE MECHANICAL TOLERANCES OUT OF SPECIFICATION
    2. ENGINE OIL PRESSURE OUT OF SPECIFICATION
    3. LOW ENGINE OIL
    4. OIL DIRTY OR DETERIORATED (Lack of scheduled oil changes)
    5. ENGINE OIL CONTAMINATED (i.e, coolant and/or fuel)

    If any of the above conditions are found, repair as necessary.

    Were any of the above conditions present? 

    Yes 

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

    No 

    1. Go To step  3).
  3. 3)  (G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 1: Checking Engine Oil Pressure Sensor Signal Circuit
    GC0015019Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C1 PCM harness connector.

    Disconnect the Engine Oil Pressure Sensor harness connector.

    Ignition on, engine not running.

    Measure the voltage on the (G6) Engine Oil Pressure Signal circuit in the Engine Oil Pressure Sensor harness connector.

    Is the voltage above 0 volts? 

    Yes 

    1. Repair the short to battery voltage in the (G6) Engine Oil Pressure Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  4).
  4. 4)  ENGINE OIL PRESSURE SENSOR 
    Fig 2: Checking Engine Oil Pressure Sensor Signal Circuit & Ground Circuit
    GC0015020Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Connect the PCM harness connector.

    Ignition on, engine not running.

    With a scan tool, monitor the Engine Oil Pressure Sensor voltage.

    Connect a jumper wire between the (K900) Sensor Ground circuit and the (G6) Engine Oil Pressure Signal circuit.

    NOTE: Engine Oil Pressure voltage should change from approximately 4.5 volts to less than 0.5 of a volt.

    Is the voltage reading within the listed specification when the jumper wire is installed? 

    Yes 

    1. Remove the Engine Oil Pressure sensor and ensure the oil passage/port is free from any blockage. If OK, replace the Engine Oil Pressure Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  5).
    NOTE: Remove the jumper wire before continuing.
  5. 5)  EXCESSIVE RESISTANCE IN THE (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT 
    Fig 3: Checking Engine Oil Pressure Sensor Signal Circuit
    GC0015021Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C1 and C2 PCM harness connectors.

    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (G6) Engine Oil Pressure Signal circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  6).

    No 

    1. Repair the excessive resistance in the (G6) Engine Oil Pressure Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6)  (G6) ENGINE OIL PRESSURE SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 4: Checking Engine Oil Pressure Sensor Signal Circuit
    GC0015022Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (G6) Engine Oil Pressure Signal circuit Engine Oil Pressure Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (G6) Engine Oil Pressure Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  7).
  7. 7)  EXCESSIVE RESISTANCE IN THE (F855) 5-VOLT SUPPLY CIRCUIT 
    Fig 5: Checking Engine Oil Pressure Sensor 5-Volt Supply Circuit
    GC0015023Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (F855) 5-volt Supply circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  8).

    No 

    1. Repair the excessive resistance in the (F855) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  8. 8)  (F855) 5-VOLT SUPPLY SHORTED TO GROUND 
    Fig 6: Checking Engine Oil Pressure Sensor 5-Volt Supply Circuit
    GC0015024Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (F855) 5-volt Supply circuit in the Engine Oil Pressure Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (F855) 5-volt Supply circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  9).
  9. 9)  EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT 
    Fig 7: Checking Engine Oil Pressure Sensor Ground Circuit
    GC0015025Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (K900) Sensor Ground circuit from the Engine Oil Pressure Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  10).

    No 

    1. Repair the excessive resistance in the (K900) Sensor Ground circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  10. 10)  PCM 
    NOTE: Before continuing, check the PCM 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 POWERTRAIN VERIFICATION TEST .

    No 

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