Turbo Boost Sensor: Testing and Inspection

Charge air pressure sensor -G31, checking





Special tools and equipment
^ VAG1526A
^ VAG1594A
^ VAG1598/31
^ VAS5051 with VAG5051 /1
or
^ VAG1551 with VAG1551/3A

Note: The charge air pressure sensor-G31-and wire connections are monitored by the Engine Control Module (ECM).

- Connect VAS5051 tester or VAG1551 scan tool and select control module for engine electronics using "address word" 01. Engine must run at idle for this.
- Check DTC memory of Engine Control Module (ECM).
If a malfunction relating to the charge air pressure sensor-G31. is indicated:

Checking voltage supply
- Switch ignition off.





- Remove engine cover (arrows).
- Disconnect connector at charge air pressure sensor.





- Connect multimeter between terminal 1 and 3 of harness connector for voltage measurement.
- Switch ignition on.
^ Specification: about 5 V
If specified value is not obtained:
- Connect VAG1598/31 test box to wiring harness for Engine Control Module (ECM), also connect ECM -1-.








- Check following wire connections for open circuit and short circuit to Ground (GND) and B+:
- Repair open circuit or short circuit if necessary.
- If the specified value is met:

Checking signal wire
- Disconnect harness connector at charge air pressure sensor.
- Connect multimeter to socket 101 and socket 108 of test box for voltage measurement.
- Start engine and run at idle.
^ Specification: about 1.90 V
- Bring engine to RPM by depressing pedal suddenly.
^ Specification: approximately 2.00 ... 3.00 V
- If specified values are not obtained:








- Check following wire connection for open circuit and short circuit to Ground (GND) and B+:
- Repair open circuit or short circuit if necessary.
If wire connection is OK:
- Replace charge air pressure sensor -G31-.