Engine hot check

This test is performed:

• if engine warm conditions are verified (nominal values for engine coolant temperature) and
• if the vehicle is run under defined conditions (load, engine speed, vehicle speed) for a sufficient time

Under these conditions the ambient air temperature is modeled.

TAM or TIA are defined as not plausible if:

• the difference between the ambient temperature and the modeled ambient air temperature is too large.
• or TIA has not moved since engine start (TIA stuck detected)

The ambient temperature value is defined as plausible if modeled TAM and TAM values are similar.