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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 

    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 TEMP SENSOR 
    Fig 1: Checking Engine Oil Temperature Sensor
    GC0027096Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the Engine Oil Temp Sensor harness connector.

    Connect a jumper wire between the (G224) Engine Oil Temp Signal circuit and the (K900) Sensor ground circuit in the Engine Oil Temp Sensor harness connector.

    Ignition on, engine not running.

    With a scan tool, read Engine Oil Temp voltage.

    Is the voltage below 1.0 volt with the jumper wire installed? 

    Yes 

    1. Replace the Engine Oil Temp Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  3).
      NOTE: Remove the jumper wire before continuing.
  3. 3)  (G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE 
    Fig 2: Checking Engine Oil Temperature Sensor Signal Circuit
    GC0027102Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C2 and C3 PCM harness connectors.

    Ignition on, engine not running.

    Measure the voltage on the (G224) Engine Oil Temp Signal circuit in the Engine Oil Temp Sensor harness connector.

    Is the voltage above 5.2 volts? 

    Yes 

    1. Repair the short to battery voltage in the (G224) Engine Oil Temp Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  4).
  4. 4)  (G224) ENGINE OIL TEMP SIGNAL CIRCUIT OPEN 
    Fig 3: Checking Engine Oil Temperature Sensor Signal Circuit
    GC0027097Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    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 (G224) Engine Oil Temp Signal circuit from the Engine Oil Temp Sensor harness connector to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the open in the (G224) Engine Oil Temp Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5)  (K900) SENSOR GROUND CIRCUIT OPEN  
    Fig 4: Checking Engine Oil Temperature Sensor Ground Circuit
    GC0027098Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance of the (K900) Sensor ground circuit from the Engine Oil Temp 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 open in the (K900) Sensor ground circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6)  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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