Checking Mass Air Flow When Idling

Checking Mass Air Flow When Idling







Unplug the connector:
- EVAP canister purge valve (321)
- Connect a test lamp to the female connector.







- Start the engine and run it at idling speed.
- Turn off the A/C.
- Read value: Airmass Deviation from Calculated (Trionic).







- State what the diagnostic tool shows:

-15% to -25% - Checking Air Leakage After Flap

Other value - Checking Mass Air Flow When Under Partial Load