Turbo Boost Sensor: Testing and Inspection

Charge air pressure sensor, checking
Checking conditions
^ A code has been recognized by the On Board Diagnostic and stored in the Diagnostic Trouble Code (DTC) memory





Special tools and equipment

^ V.A.G 1526 or Fluke 83 multimeter
^ V.A.G 1594 A Adapter set
^ V.A.G 1598/31 Test box
^ Wiring diagram

Checking voltage supply and wiring to control module
- Switch ignition off.





- Pull 4-pin connector -2- off charge air pressure sensor -G31-, -1-.





- Connect multimeter to measure voltage using auxiliary cables from V.A.G 1594 to connector contacts 1 + 3.
- Switch ignition on.
^ Specification: min. 4.5 V
- Switch ignition off.
If the specification is not obtained:





- Connect test box V.A.G 1598/31 to control unit wiring harness (The engine control module remains disconnected).





- Check wiring between test box and connector for open circuit according to wiring diagram.
Contact 1 + socket 108
Contact 2 + socket 98
Contact 3 + socket 101
^ Wire resistance: Max. 1.5 Ohms
- Additionally check wires for short to one another.
If no faulty wiring is detected and voltage was present between contacts 1 + 3:

If no faulty wiring is detected and no voltage was present between contacts 1 + 3:
- Replace engine control module, Refer to Powertrain Mangement.

Checking function
- Connect the test box V.A.G 1598/31 to engine control module wiring harness and to engine control module.
- Reconnect connector to charge air pressure sensor -G31-.
- Connect multimeter to sockets 101 and 108.
- Start engine and measure basic voltage.
^ Specification: 1.80 to 2.00 V





- Raise engine revs by pressing accelerator to:
^ Specification: 2.00 to 3.00 V
If the specifications are not attained:
- Replace Charge air pressure sensor -G31-.