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 Miss Air Flow When Under Partial Load