Enable Criteria

General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperatures must exceed -7°C.

• Test 1: Engine running. A counter accumulates the time during which the mass air flow has exceeded 10 grams/second. Counter has reached 400 seconds.
• Test 2: Engine running. A substitute value is calculated for the engine coolant temperature: The starting intake air temperature is incremented with 1°C per 60g air mass/s. A counter accumulates the time during which the air mass flow has exceeded 10 milligrams/seconds. A maximum is set for the substitute value after 350s that is dependent on the intake air temperature (normally 65-80°C). The maximum value is set as soon as the air mass/combustion is not too high and the air mass/s is not too low, so that the intake air temperature will be as close as possible to the outdoor temperature. After 400s, the sensor value will be compared with the substitute value.