LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS U0101 To P0153 >> DTC P0117, P0118: ECT Sensor >> DTC Logic >> DTC Detection Logic
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC Detection Logic

DTC No. Trouble diagnosis name (Trouble diagnosis content) DTC detecting condition Possible cause
P0117 ECT SEN/CIRC
(Engine coolant temperature sensor circuit low input)
An excessively low voltage from the sensor is sent to ECM.
  • Harness or connectors

    (The engine coolant temperature sensor circuit is open or shorted.)

  • Engine coolant temperature sensor
P0118 ECT SEN/CIRC
(Engine coolant temperature sensor circuit high input)
An excessively high voltage from the sensor is sent to ECM.