With Generic Scan Tool

Charge Air Pressure Sensor -G31-, Checking







Recommended special tools and equipment
- V.A.G1526A hand multimeter
- V.A.G1594A connector test kit
- V.A.G1598/31 test box

Procedure







- Disconnect connector (arrow) at charge air pressure sensor.

Checking voltage supply







- Connect multimeter between terminal 1 and 3 of harness connector for voltage measurement.
- Switch ignition on.

Specified value: about 5 V

- Switch ignition off.

If specified value is not obtained:
- Connect test box to wiring harness of Engine Control Module (ECM). ECM is not connected. Test Box, Connecting For Wiring and Component Test







- Check the following wire connections for open circuit and short circuit to Ground (GND) and B+:

Harness connector Terminal Test box Socket
1 108
3 98

- Repair open circuit in wiring or short circuit if necessary.

If specified value is obtained:

Checking signal wire
- Connect harness connector at charge air pressure sensor.
- Connect multimeter to socket 101 and socket 108 of test box for voltage measurement.
- Start engine and let run at idle.

Specified value: about 1.90 V

- Bring engine to RPM by depressing pedal suddenly.

Specified value: 2.00 to 3.00 V

If specified values are not obtained:







- Check the following wire connection for open circuit and short circuit to Ground (GND) and B+:

Harness connector Terminal Test box Socket
4 101

Specified value: Wire resistance max 1.5 Ohms

- Check the wire for short circuit to B+ and Ground (GND).

Specified value: Infinite Ohms (no continuity)

- If necessary, repair wire connection.

If no malfunctions are found in wire:
- Replace the Charge Air Pressure Sensor -G31-.

Final procedures
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check DTC memory. Mode 3: Check DTC Memory
2. If necessary, erase DTC memory. Mode 4: Reset/Erase Diagnostic Data
3. Generate readiness code. Readiness Code, Generating

- End diagnosis and switch ignition off.