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P0117 Engine Coolant Temperature (ECT) Sensor Voltage Too Low

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https://mopar1973man.com/cummins/articles.html/3rd-generation/engine/obdii-error-codes/p0117-engine-coolant-temperature-ect-sensor-voltage-too-low-r172/

By Mopar1973Man

· 2,597 views

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)
    • https://mopar1973man.com/cummins/articles.html/3rd-generation/engine/obdii-error-codes/p0117-engine-coolant-temperature-ect-sensor-voltage-too-low-r172/

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