Charge Air Pressure Sensor -G31-, Testing

Charge Air Pressure Sensor -G31-, Testing







Special tools, testers and other equipment required
- V.A.G 1526 A
- V.A.G 1594 A
- V.A.G 1598/31
- VAS 5051 with VAS 5051/1
or
- V.A.G 1551 with V.A.G 1551/3 A

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

- Connect vehicle diagnostic, testing and information system VAS 5051 (or DTC reader V.A.G 1551) and select engine electronics control module by entering "Address word" 01. When doing this the engine must be running at idling speed.

- Interrogate DTC memory of engine control module.

If the display shows a DTC relating to charge air pressure sensor -G31-:

Testing voltage supply
- Disconnect electrical connector on charge air pressure sensor.







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

- Specification: approx. 5 V

If the specification is not attained:







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







- Test for open circuit and short to positive or Ground in the following wiring connections:

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

- Rectify short circuit or open circuit if necessary.

If the specification is attained:

Testing 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:







- Test for open circuit and short to positive or Ground in the following wiring connections:

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

- Rectify short circuit or open circuit if necessary.

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