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Home >> Infiniti >> 2017 >> QX80 Base, RWD >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (DTCS) (1 Of 4) >> DTC/Circuit Diagnosis >> DTC P0116: Engine Coolant Temperature Sensor 1 >> DTC Logic >> DTC Detection Logic
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DTC Detection Logic

DTC No. Trouble diagnosis
(Trouble diagnosis content)		 DTC detecting condition Possible cause
P0116 ECT SEN/CIRC
[Engine coolant temperature (ECT) sensor 1 circuit range/performance]
  • The comparison result of signals transmitted to ECM from each temperature sensor (IAT sensor, ECT sensor 1, FTT sensor, and EOT sensor) shows that the voltage signal of the ECT sensor 1 is higher/lower than that of other temperature sensors when the engine is started with its cold state.
  • Engine coolant temperature signal from engine coolant temperature sensor does not fluctuate, even when some time has passed after starting the engine with pre-warming up condition.
  • Harness or connectors

    (High or low resistance in the ECT sensor 1 circuit)

  • ECT sensor 1
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