Checking Mass Air Flow When Under Partial Load

Checking mass air flow when under partial load









- Turn the ignition switch to the OFF position.

Plug in the connector:
EVAP canister purge valve





- Drive the car in top gear with a steady high engine load.
- Driving uphill is recommended.
- Read value: Airmass Deviation from Calculated (Trionic).
- State what the diagnostic tool shows:

15% to 25% - Checking Air Leakage Before Flap

Other Value - Checking the Fuel Supply