Function test
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2006 Volkswagen Golf, 2005 Volkswagen Jetta, 2005 Volkswagen Golf, 2004 Volkswagen Jetta, and 2004 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.
- Connect diagnostic tester. Refer to Diagnostic tester, connecting .
- Start engine and let run at idle.
- Under address word 33, select "Diagnostic mode 1: Checking measured values."
- Select the measuring value "PID 16: Air flow quantity at Mass Air Flow (MAF) sensor".
- Check specified value of air flow quantity at Mass Air Flow (MAF) Sensor at idle:
Vehicles with engine code ALH:
Specified value: 2.80 to 5.30 g/sec
Vehicles with engine code BEW:
Specified value: 1.80 to 4.30 g/sec
- End diagnosis and switch ignition off.
If specified value is obtained, but DTC memory has a DTC concerning Mass Air Flow (MAF) sensor:
- Check voltage supply of Mass Air Flow (MAF) sensor. Refer to Voltage supply for Mass Air Flow (MAF) sensor, checking .
If specified value is not obtained:
- Check signal and Ground (GND) wires of Mass Air Flow (MAF) sensor. Refer to Checking signal and Ground wires of Mass Air Flow (MAF) Sensor .