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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Powertrain DTC Charts & Descriptions (Except Diesel & Hybrid) >> DTC Diagnosis >> DTC P0117: - Engine Coolant Temperature (ECT) Sensor 1 Circuit Low

DTC P0117: - Engine Coolant Temperature (ECT) Sensor 1 Circuit Low

DTC P0117: - ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1 CIRCUIT LOW

Description:  Indicates the sensor signal is less than the self-test minimum. The ECT sensor minimum is 0.2 volt or 121°C (250°F).
Possible Causes: 
  • Grounded circuit in the harness
  • Damaged sensor
  • Incorrect harness connection
Diagnostic Aids:  A concern is present if an ECT PID reading less than 0.2 volt with the ignition ON engine OFF or during any engine operating mode.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to Pinpoint Test DX .