Turbo Boost Sensor: Testing and Inspection

Charge Air Pressure Sensor -G31-, testing





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

Test sequence

Note: Charge Air Pressure Sensor -G31- and its wiring are monitored by engine control unit.

- Connect vehicle diagnostic, test and information system VAS 5051 and select vehicle system "01 - Engine electronics". When doing this ignition must be on.

- check fault memory of engine control module.

If display shows a malfunction relating to Charge Air Pressure Sensor -G31-





- Open quick-release fasteners -1- and -2- and lift off engine cover panel (arrows).





- Unplug connector (arrow) on Charge Air Pressure Sensor -G31-.

Testing voltage supply





- Connect multimeter (voltage measurement range) between contacts 1 and 3 on connector.
- Switch on ignition.
^ Specification: approximately 5 Volts

If specification is not attained





- Connect test box V.A.G 1598/31 to wiring harness connectors; do not connect engine control unit. Attach ground clip of test box to chassis (not shown in illustration).

WARNING: To prevent damage to electronic components, switch to respective measuring range before connecting measuring cable and observe test prerequisites.

Part 1:

Part 2:

- Test for open circuit and short to positive or ground in following wiring connections:
- Eliminate open circuit or short circuit using wiring diagram.

If specification is obtained:

Testing signal wire
- Plug in connector on charge pressure sender.
- Connect multimeter (voltage measurement range) between sockets 10 1 and 108 on test box.
- Start engine and run at idling speed.
^ Specification: approximately 1.90 Volts

- Increase engine speed by operating throttle quickly.
^ Specification: 2.00 to 3.00 Volts

If specifications are not obtained:

Part 1:

Part 2:

- Test for open circuit and short to positive or ground in following wiring connections:
- Eliminate open circuit or short circuit using wiring diagram.

If wiring is OK:
- Replace Charge Air Pressure Sensor -G31-.