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