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Home >> Chrysler >> 2009 >> 300 Signature Series >> Repair and Diagnosis >> External Pages >> Different car >> Section 200 (DTCS P0016 To P0128, Intermittent Condition, Checking Exhaust System, Temperature Sensors, Power & Ground Circuits) >> P0117-Engine Coolant Temperature Sensor Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. 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  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  3).
  3. 3) (K2) ECT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT 
    Fig 1: Measuring Resistance Between Sensor Ground Circuit & ECT Signal Circuit
    GC0041574Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    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  4).
  4. 4) (K2) ECT SIGNAL CIRCUIT SHORTED GROUND 
    Fig 2: Measuring Resistance Between Ground & ECT Signal Circuit
    GC0041573Courtesy of CHRYSLER LLC

    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  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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