Charge Air Pressure Sensor -G31-, Checking

Charge Air Pressure Sensor -G31-, Checking







Special tools, testers and other equipment required

- V.A.G 1526 A Multimeter
- V.A.G 1594 A Connector test kit
- V.A.G 1598/31 Test box
- VAS 5051 Vehicle diagnosis, testing and information system with VAS 5051/1 Adapter
or
- V.A.G 1551 Scan Tool with V.A.G 1551/3 A Adapt

NOTE: Charge air pressure sensor -G31- and its wiring are monitored by the engine control module.

- Connect vehicle diagnosis, testing and information system VAS 5051 (or scan tool V.A.G 1551) and select "Engine Electronics" control module by entering address word 01. Engine must be running at idling speed.
- Check DTC memory of engine control module.

If the display shows a malfunction relating to charge air pressure control valve -G31-:
- Check voltage supply.

Checking voltage supply
- Disconnect connector on charge air pressure sensor.







- Connect multimeter (voltage measurement range) between terminals 1 and 3 on connector.
- Switch ignition on.

Specification: approx. 5 V

If the specification is not obtained:







- Connect test box V.A.G 1598/31 to wiring harness for engine control module and also to engine control module itself (-1-).







- Check for open circuit and short to positive or ground (GND) in following wiring connections:

Connector terminal Test box V.A.G 1598/31 terminal
1 108
3 98

- Repair short circuit or open circuit if necessary.

If the specification is obtained:
- Check signal wire.

Checking signal wire

- Plug in connector on charge air pressure sensor.
- Connect multimeter (voltage measurement range) between sockets 101 and 108 on test box.
- Start engine and run at idling speed.

Specification: approx. 1.90 V

- Increase engine speed by operating throttle quickly.

Specification: 2.00-3.00 V

If the specifications are not obtained:







- Check for open circuit and short to positive or ground (GND) in following wiring connections:

Connector terminal Test box V.A.G 1598/31 terminal
4 101

- Repair short circuit or open circuit if necessary.

If the wiring is OK:
- Replace Charge air pressure sensor -G31-.