Evaluation: Actual mass of inducted air, display

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, 1997 Volkswagen Passat, 1997 Volkswagen Jetta, and 1996 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.

EVALUATION: ACTUAL MASS OF INDUCTED AIR, DISPLAY

Scan tool display	Possible cause	Corrective action
Below 230 mg/H	Excessive exhaust gas recirculation	Check EGR, see EXHAUST SYSTEM, EMISSION CONTROLS
Below 230 mg/H	Unmeasured air	Check intake air system for leaks
Above 390 mg/H	Engine too cold	Run engine at increased speed to warm up, then repeat check
	Insufficient exhaust gas recirculation	Let engine run at idle for 3 minutes, then give burst of throttle
	Mass Air Flow (MAF) sensor -G70- faulty	Check EGR and check MAF sensor See EXHAUST GAS RECIRCULATION (EGR) AND MASS AIR FLOW (MAF) SENSOR FUNCTIONS, CHECKING If there is a malfunction, the measuring value block indicates a constant air mass value of approx. 550 mg/H over the complete RPM and load range