Checking signal wiring

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Connect connector for charge air pressure sensor.
Connect multimeter and measure voltage at sockets 101 and 108 of test box.
Start engine and let it idle.

Specification: approx. 1.90 V

Increase engine speed by quickly depressing accelerator pedal.

Specification: 2.00 to 3.00 V

If readings do not match specifications:

Fig 1: Identifying Connector Terminals 1 And 4

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Check for open circuit and short to Ground/positive in following wiring connection:

Connector contact	Test box VAG1598/31 socket
4	101

If necessary, eliminate open circuit/short circuit.

If wiring is OK:

Replace Charge air pressure sensor G31.