Circuit Description
WARNING: This page is about a different car, the 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
The powertrain control module (PCM) uses the following information to calculate an expected airflow rate:
- The throttle position (TP)
- The barometric pressure (BARO)
- The super charger inlet pressure (SCIP)
- The intake air temperature (IAT)
- The mass air flow (MAF)
- The engine RPM
If the PCM detects the airflow rate is more than expected, DTC P0068 sets.