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Home >> Toyota >> 2009 >> Prius Base >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem >> Typical Enabling Conditions
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Typical Enabling Conditions

ECT sensor cold start monitor: 

TYPICAL ENABLING CONDITIONS

Monitor will not run if the following DTCs are present None
Battery voltage 10.5 V or more
Time after engine start 1 second or more
ECT at engine start Less than 60°C (140=F)
IAT sensor circuit OK
Soak time 0 seconds or more
Accumulated MAF 1367 g or more
Engine Not running
Fuel cut OFF
Difference between ECT at engine start and IAT Less than 40°C (72°F)

ECT sensor soak monitor: 

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not present None
Battery voltage 10.5 V or more
Engine Running
Soak time 5 hours or more
Either conditions (a) or (b) is met: -
(a) ECT 60°C (140°F) or more
(b) Accumulated MAF 2966 g or more