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P0116 Engine Coolant Temperature (ECT) Sensor Rationality

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Mopar1973Man

By Mopar1973Man

P0116 ENGINE COOLANT TEMPERATURE (ECT) SENSOR RATIONALITY

When Monitored and Set Condition:

When Monitored: While the engine is running.
Set Condition: The ECM does not read a change in value from the sensor over time.

POSSIBLE CAUSES

  • LOW COOLANT LEVEL
  • COOLANT TEMPERATURE SENSOR
  • THERMOSTAT
  • INTERMITTENT CONDITION

DIAGNOSTIC PROCEDURE

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

  1. With the engine cold, verify the level of coolant in the radiator. Is the radiator full of coolant?
    Yes --> Go To 2
    No --> Fill the radiator with coolant- refer to the owners manual for assistance. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
  2. Remove the temperature sensor and reconnect the wiring to the sensor. Turn the ignition on. Monitor DRBIII®, while heating the sensor with an external heat source (DO NOT USE OPEN FLAME). Does the reading from the sensor increase at least 5 degrees F. on the DRBIII®?
    Yes --> Go To 3
    No --> Replace the coolant temp sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). NOTE: Refer to the Symptom: *FUEL HEATER THERMOSTAT TEST to ensure the thermostat is operating properly.
  3. Is the thermostat operating properly?
    Yes --> Refer to the SYMPTOM: INTERMITTENT CONDITION Symptom (Diagnostic Procedure). Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    No --> Replace the Thermostat. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

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