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Typical Enabling Conditions

WARNING: This page is about a different car, the 2006 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL ENABLING CONDITIONS

Monitor will run whenever these DTCs are not present P0100 - P0103 (MAF sensor)

ECT sensor stuck (low ECT): 

ECT SENSOR RESISTANCE CHART

Cumulative idle off period 250 seconds or more
Vehicle speed increase of 30 km/h (19 mph) or more 10 times or more
ECT 35 to 60°C (95 to 140°F)
IAT -6.7°C (20°F) or more

ECT sensor stuck (high ECT): 

ECT SENSOR RESISTANCE CHART

ECT 60°C (220°F) or more
IAT -6.7°C (20°F) or more
"Stop and go" *1 One or more times
"Steady driving and stop" *2 One or more times
Engine running time after engine start 0.3 seconds or more

HINT:

*1: Vehicle is stopped for 20 seconds or more and accelerated to more than 70 km/h (44 mph) within 40 seconds.

*2: Follow these steps: 1) vehicle is driven at 65 km/h (40 mph) or more for 30 seconds or more and the vehicle speed reaches 70 km/h (44 mph); 2) vehicle is decelerated from 65 km/h (40 mph) to 3 km/h (2 mph) or less within 35 seconds; and 3) vehicle is stopped for 10 seconds.