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Home >> Jeep >> 2007 >> Grand Cherokee Laredo, 3.0 M >> Repair and Diagnosis >> Engine Performance >> System >> Diesel - DTCS P0100 To P0197 >> P0183-Fuel Temperature Sensor Circuit High >> Diagnostic Test

Diagnostic Test

  1. 1) DTC IS ACTIVE 

    Ignition on, engine not running.

    With the scan tool, Clear DTCs in the Engine Control Module (ECM).

    Monitor the scan tool for at least two minutes.

    Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.

    Start the engine.

    Allow the engine to reach normal operating temperature.

    With the scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go to step  2).

    No 

    1. Refer to *CHECKING FOR AN INTERMITTENT CONDITION .
  2. 2) (K156) FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Checking Fuel Temperature Sensor Signal Circuit
    GC0040004Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Fuel Temperature Sensor harness connector.

    Disconnect the Engine Control Module (ECM) harness connector.

    Remove the ASD Relay from the PDC.

    Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.

    Turn the ignition on.

    Measure the voltage of the (K156) Fuel Temperature Sensor Signal circuit in the Fuel Temperature Sensor harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the (K156) Fuel Temperature Sensor Signal circuit for a short to voltage.
    2. Perform ECM VERIFICATION TEST .

    No 

    1. Go to step  3).
  3. 3) (K914) FUEL TEMPERATURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Checking Fuel Temperature Sensor Ground Circuit
    GC0040005Courtesy of CHRYSLER LLC
    NOTE: The jumper wire should still be in place.

    Measure the voltage of the (K914) Fuel Temperature Sensor Ground circuit in the Fuel Temperature Sensor harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the (K914) Fuel Temperature Sensor Ground circuit for a short to voltage.
    2. Perform ECM VERIFICATION TEST .

    No 

    1. Go to step  4).
  4. 4) FUEL TEMPERATURE SENSOR 

    Turn the ignition off.

    Remove the jumper wire and install the ASD relay.

    Connect the Engine Control Module (ECM) harness connector.

    Connect a jumper wire between the (K914) Fuel Temperature Sensor Ground circuit and the (K156) Fuel Temperature Sensor Signal circuit in the Fuel Temperature Sensor harness connector.

    Turn the ignition on.

    With the scan tool, Clear DTCs.

    With the scan tool, select View DTCs.

    NOTE: The scan tool should display a Fuel Temperature Sensor low voltage or short to ground DTC with the jumper wire in place.

    Does the scan tool display the DTC(s) as described above? 

    Yes 

    1. Replace the Fuel Temperature Sensor in accordance with the Service Information.
    2. Perform ECM VERIFICATION TEST .

    No 

    1. Go to step  5).
  5. 5) (K156) FUEL TEMPERATURE SENSOR SIGNAL OPEN OR HIGH RESISTANCE 
    Fig 3: Checking Fuel Temperature Sensor Signal Circuit Open Circuit Or High Resistance
    GC0040003Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the Engine Control Module (ECM) harness connector.

    Measure the resistance of the (K156) Fuel Temperature Sensor Signal circuit between the Fuel Temperature Sensor harness connector and the Engine Control Module (ECM) harness connector.

    Is the resistance below 10.0 ohms? 

    Yes 

    1. Go to step  6).

    No 

    1. Repair the (K156) Fuel Temperature Sensor Signal circuit for an open circuit or high resistance.
    2. Perform ECM VERIFICATION TEST .
  6. 6) (K914) FUEL TEMPERATURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking Fuel Temperature Sensor Ground Circuit
    GC0040006Courtesy of CHRYSLER LLC

    Measure the resistance of the (K914) Fuel Temperature Sensor Ground circuit between the Fuel Temperature Sensor harness connector and the Engine Control Module (ECM) harness connector.

    Is the resistance below 10.0 ohms? 

    Yes 

    1. Go to step  7).

    No 

    1. Repair the (K914) Fuel Temperature Sensor Ground circuit for an open circuit or high resistance.
    2. Perform ECM VERIFICATION TEST .
  7. 7) ENGINE CONTROL MODULE (ECM) 

    Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Temperature Sensor and the Engine Control Module (ECM).

    Look for any chafed, pierced, pinched, or partially broken wires.

    Look for broken, bent, pushed out or corroded terminals.

    Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.

    Look for the data to change or for the DTC to reset during the wiggle test.

    Refer to any Technical Service Bulletins that may apply.

    Were any problems found? 

    Yes 

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

    No 

    1. Replace the Engine Control Module (ECM) in accordance with the Service Information.
    2. Perform ECM VERIFICATION TEST .
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