With Manufacturer's Scan Tool

Charge Air Pressure Sensor -G31-, Checking

Special tools and equipment
- VAG 1526 A Multimeter or equivalent
- VAG 1594 A Connector test set
- VAG 1598/31 Adapter
- VAS 5051 Vehicle Diagnostic, Testing and Information System VAS 5051 with VAS 5051/1
or
- VAG 1551 Scan Tool with VAG 1551/3 A

Requirement
- Vehicle Diagnostic, Testing and Information System VAS 5051 or VAG 1551 Scan Tool must be connected.

Work sequence

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

- Read DTC memory of engine control module.

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

Checking power supply
- Disconnect connector (arrow) on charge air pressure sensor.
- Connect multimeter and measure voltage between contacts 1 and 3 of connector.
- Switch on ignition.

Specification: approx. 5 V

If reading does not match specification:
- Connect test box VAG 1598/31 to engine control module wiring harness. Engine control module must also be connected.
- Check for open circuit and short to Ground/positive in following wiring:

Connector Test box VAG 1598/31 socket
contact
1 108
3 98

- If necessary, eliminate open circuit/short circuit.

If measured value matches specification:

Checking signal wiring
- Connect connector for charge air pressure sensor.
- Connect multimeter and measure voltage at sockets 101 and 108 of test box.
- Start engine and let it idle.

Specification: approx. 1.90 V

- Increase engine speed by quickly depressing accelerator pedal.

Specification: 2.00 to 3.00 V

If readings do not match specifications:
- Check for open circuit and short to Ground/positive in following wiring connection:

Connector Test box VAG 1598/31
contact socket
4 101

- If necessary, eliminate open circuit/short circuit.

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