Exhaust Gas Recirculation (EGR) and Mass Air Flow (MAF) sensor functions, checking: Notes
WARNING: This page is about a different car, the 1999 Volkswagen Jetta, 1998 Volkswagen Jetta, and 1997 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.
Exhaust Gas Recirculation and Mass Air Flow sensor function can be checked via Output Diagnostic Test Mode (Function 03) and by also calling-up measuring value block 03 (Function 08). To do this, activate the Output DTM component: EGR Vacuum Regulator Solenoid valve N18 and then after exiting the Output Diagnostic Test Mode, check N18 via the -C- button.
By using this sequence, the EGR valve continues to be pulsed so that with the help of measuring value block 03 (display field 3) the extreme values for the EGR valve/Mass Air Flow sensor can be displayed.