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  • P0117 Engine Coolant Temperature (ECT) Sensor Voltage Too Low

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    Mopar1973Man

    P0117 ENGINE COOLANT TEMPERATURE (ECT) SENSOR VOLTAGE TOO LOW

    When Monitored and Set Condition:

    When Monitored: With ignition on and battery voltage greater than 10.4 volts.
    Set Condition: The circuit voltage to the ECM falls below a calibrated threshold for a certain period of time.

    POSSIBLE CAUSES

    • COOLANT TEMPERATURE SENSOR
    • INTERMITTENT CONDITION
    • (K2) SENSOR SIGNAL CIRCUIT SHORTED TO GROUND OR (K104) RETURN CIRCUIT
    • WIRING HARNESS SHORTED
    • ECM

    DIAGNOSTIC PROCEDURE

    NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.

    1. Turn the ignition off. Disconnect the Coolant Temp sensor harness connector. Check connectors - Clean/repair as necessary. Measure the resistance of the Temp sensor. Is the resistance between 300 and 90k ohms?
      Yes --> Go To 2
      No --> Replace the Coolant Temperature sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    2. Reconnect the coolant temp sensor connected. Turn the ignition on. With the DRBIII®, erase DTCs. With the DRBIII®, read DTCs. Did the DTC reset?
      Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Go To 3
    3. Turn the ignition off. Disconnect the ECM harness connector. Check connectors - Clean/repair as necessary. Measure the resistance between the engine ground and the (K2) temperature sensor signal circuit at the sensor harness connector. Is the resistance more than 100 k ohms?
      Yes --> Go To 4
      No --> Repair or replace the short harness. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    4. Measure the resistance between the (K2) signal circuit and all other circuits at the ECM harness connector. Is the resistance more than 100k ohms?
      Yes --> Go To 5
      No --> Repair or replace shorted wiring harness Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    5. Reconnect the ECM harness connectors. Turn the ignition on. With the DRBIII®, erase DTCs. While monitoring the DRBIII®, Disconnect the temperature sensor harness connector. Did the DTC P0118 set?
      Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL)


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