P0401 Air quantity control

			Test results
1	COMPONENT CONCERNED	CHECK FOR LEAKS DOWNSTREAM OF THE FLOW METER	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Intake duct	Check for leaks in the intake duct downstream of the flow meter	Go to Step 2	Leaks	Restore the correct operation of the intake duct
2	COMPONENT CONCERNED	FLOW METER OPERATION CHECK	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	Airflow meter	Check that the airflow meter is working properly	Go to Step 3	Airflow meter not working properly	Replace the airflow meter Op. 1060G10 AIR FLOW METER - R.R.
3	COMPONENT CONCERNED	CHECK USING DIAGNOSIS EQUIPMENT	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	High pressure EGR valve	Connect the diagnostic tool to the powertrain control module, go to the “ACTUATORS” menu and launch procedure “EGR DC Motor test”. Check the outcome of the test	Go to Step 4	The test did NOT have a positive outcome	Replace the high pressure EGR valve Op. 1080C24 E.G.R. SYSTEM SOLENOID - R + R
4	COMPONENT CONCERNED	CHECK USING DIAGNOSIS EQUIPMENT	OK (NO FAULTS DETECTED)	FAULT DETECTED	OPERATION
	High pressure EGR valve	Check for other error codes stored in the powertrain control module	End of diagnosis	Additional errors stored in the Powertrain Control Module	Follow the instructions provided by the diagnostic tool to resolve the errors