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Home >> Infiniti >> 2008 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - DTCS U1000 To P0308 >> DTC P0117, P0118: ECT Sensor >> On Board Diagnosis Logic >> Fail-Safe Mode

Fail-Safe Mode

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

FAIL-SAFE MODE CHART

Detected items Engine operating condition in fail-safe mode
Engine coolant temperature sensor circuit Engine coolant temperature will be determined by ECM based on the following condition. CONSULT-III displays the engine coolant temperature decided by ECM.
Condition Engine coolant temperature decided (CONSULT-III display)
Just as ignition switch is turned ON or START 40°C (104°F)
Approx 4 minutes or more after engine starting 80°C (176°F)
Except as shown above 40 - 80°C (104 - 176°F) (Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates while engine is running.
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