Checking Mass Air Flow When Idling

Checking Mass Air Flow When Idling









- Note the value on Manifold Absolute Pressure, it will be used later as a comparison during fault diagnosis.





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 - I
Other Value - Checking Mass Air Flow When Under Partial Load