Diagnosis of Intake Air Temperature Sensor

Comprehensive Component Monitoring

Diagnosis of Intake Air Temperature Sensor
A maximum plausible signal check is continuously performed.

The intake air temperature signal may become faulty, due to a wiring interruption, or a short to ground.

If the sensor signal exceeds a threshold a "sensor signal max." fault is detected.

In order to detect a faulty temperature sensor signal below the plausible operation limit, additional conditions (e.g. time delay after end-of-start has elapsed, minimum idling time without fuel cut off, permanent low temperature and ambient temperature above threshold) have to be met in order to determine that a working sensor would have to output a higher value, as a result of heat soak from the engine. Otherwise, when below this threshold, a sensor signal fault is detected.

The function consists of two parts (2 different error flags):
1) detection of electronic connection fault
2) rationality check and stuck check

Diagnose Of Intake Air Temperature Sensor (electronic Connection Fault):

Diagnose Of Intake Air Temperature Sensor (rationality Check, Low Side Check):

Diagnose Of Intake Air Temperature Sensor (rationality Check, High Side Check):

Diagnose Of Intake Air Temperature Sensor (rationality Check, Stuck Check):