Turbo Boost Sensor: Testing and Inspection

Only for engine code ATW

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
- V.A.G 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 front 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 contains 1 + 3:
See Checking function, below.

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

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-.