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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 TEMPERATURE SENSOR 

    Turn the ignition off.

    Disconnect the Engine Oil Temp Sensor harness connector.

    Ignition on, engine not running.

    With a scan tool, read Engine Oil Temp voltage.

    Is the voltage above 1.0 volt? 

    Yes 

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

    No 

    1. Go To step  3).
  3. 3)  (G224) ENGINE OIL TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 1: Checking Engine Oil Temperature Sensor Signal Circuit & Ground Circuit
    GC0027100Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C2 and C3 PCM harness connectors.

    Measure the resistance between the (K900) Sensor ground circuit and the (G224) Engine Oil Temp Signal circuit in the Engine Oil Temp Sensor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short to between the (K900) Sensor ground circuit and 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 SHORTED GROUND 
    Fig 2: Checking Engine Oil Temperature Sensor Signal Circuit
    GC0027099Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (G224) Engine Oil Temp Signal circuit in the Engine Oil Temp Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

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

    No 

    1. Go To step  5).
  5. 5)  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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