Circuit Description
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM) uses the following information in order to calculate an expected airflow rate:
- The throttle position (TP)
- The barometric pressure (BARO)
- The intake air temperature (IAT)
- The engine RPM
If the ECM detects the airflow rate is more than expected, DTC P0068 will set.