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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 543 (Engine Controls - DTCS P0016 To P0118, Diagnostic Code Index, Pre-Diagnostic Troubleshooting, Intermittent Condition) >> Diagnosis And Testing >> P0117-Engine Coolant Temperature Sensor Circuit Low >> Diagnostic Test

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)  ECT SENSOR VOLTAGE BELOW 0.078 OF A VOLT 

    Ignition on, engine not running.

    With a scan tool, read the ECT voltage.

    Is the voltage below 0.078 of a volt? 

    Yes 

    1. Go To step  2).

    No 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .
  2. 2)  ECT SENSOR 

    Turn the ignition off.

    Disconnect the ECT harness connector.

    Ignition on, engine not running.

    With a scan tool, read ECT voltage.

    Is the voltage above 1.0 volt? 

    Yes 

    1. Replace the ECT Sensor.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  3).
  3. 3)  (K2) ECT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 1: Checking ECT Sensor Signal Circuit For Short To Ground Circuit
    GC0002668Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the C2 PCM harness connector.

    Measure the resistance between the (K900) Sensor ground circuit and the (K2) ECT Signal circuit in the ECT Sensor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short to between the (K900) Sensor ground circuit and the (K2) ECT Signal circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  4).
  4. 4)  (K2) ECT SIGNAL CIRCUIT SHORTED GROUND 
    Fig 2: Checking ECT Sensor Signal Circuit For Short To Ground
    GC0002667Courtesy of DAIMLERCHRYSLER CORP.

    Measure the resistance between ground and the (K2) ECT Signal circuit in the ECT Sensor harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K2) ECT 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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