Engine cold check

This test is performed:

• if cold start conditions are verified and
• if the intake air temperature is stable during a pre-defined period of time after start (to insure that the vehicle has not been driven from a warm location to a cold location - and vice versa - which would lead to false detection).

The cold start conditions check verifies both TAM close to Coolant temperature (TCO) or TIA close to TCO. The engine cold check criteria used is different if cold conditions is detected from TAM close to TCO or from TIA close to TCO as we have not the same confidence in those two cases.

The implausibility is detected if the difference between the ambient temperature and the air intake temperature is not within its thresholds.

However several scenarios (ex: vehicle standing in the sun/strong wind/use of an engine block heater ...) could lead to a false detection. Therefore a second check (see: "ENGINE HOT CHECK " below) may be needed.