Turbo Boost Sensor: Testing and Inspection

Charge Air Pressure Sensor -G31-, checking
Special tools and equipment





^ 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

Test requirements:
^ Vehicle diagnostic, testing and information system VAS 5051 or V.A.G 1551 Scan Tool connected.

Test sequence

Note: The Charge Air Pressure sensor -G31- and the wiring connections are monitored by the engine control module.

^ Read Diagnostic Trouble Code (DTC) memory of engine control module.

If a DTC relating to the Charge Air Pressure sensor -G31- is displayed:





Checking power supply
^ Disconnect connector -arrow- on charge pressure sender.





^ Connect multimeter between contacts 1 and 3 of connector to measure voltage.
^ Switch ignition on.
- Specified value: approximately 5 Volts

If specified value is not attained:





^ Connect VAG 1598/31 test box to wiring harness leading to engine control module; engine control module must also be connected.





^ Check for open circuit and short to positive or Ground in the wiring connections:





^ Repair any open/short circuit as necessary.

If specified value is attained:

Checking signal wire
^ Attach connector from charge air pressure sensor.
^ Attach multimeter for voltage test to socket 101 and socket 108 of test box.
^ Start engine and run at idling speed.
- Specified value: approximately 1.90 Volts

^ Bring engine to speed by spontaneous acceleration.
- Specified value: 2.00 ... 3.00 Volts

If specified values are not attained:





^ Check for open circuit and short to positive or Ground in the wiring connection:





^ Repair any open/short circuit as necessary.

If the wiring is OK:
^ Replace Charge Air Pressure sensor -G31-