Checking Mass Air Flow When Under Partial Lead

Checking Mass Air Flow When Under Partial Lead













- 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