Audi Workshop Service and Repair Manuals

Special tools,
testers and equipment required

• ◆ V.A.G 1526 A
• ◆ V.A.G 1527 B
• ◆ V.A.G 1594 A
• ◆ V.A.G 1598 A
• ◆ V.A.G 1598/11

Fitting location => Fitting locations overview, Page 24-6

Notes:

• ◆ The throttle valve potentiometer (G69) informs the engine control unit of the position of the throttle valve.
• ◆ Checking operation=> Reading measured value block display group 002, Page 01-104.

Checking internal resistance

• ‒ Pull connector off throttle valve potentiometer.

• ‒ → Connect multimeter between contacts 1 and 2 to measure resistance.
• ‒ Specification: 1,5 ... 2.6 kω
• ‒ Connect multimeter between contacts 2 and 3 to measure resistance.
• ‒ Specification: 0,75 ... 1.3 kω
• ‒ Slowly move the throttle valve lever to full throttle position.
• ‒ Specification: Increasing resistance up to max. 3.6 kω

If a specification is not met:

• ‒ Renew throttle valve potentiometer.

Checking power supply

• ‒ Pull connector off throttle valve potentiometer.
• ‒ Switch the ignition on.
• ‒ → Connect multimeter between contacts 1 (positive) and 2 (earth) to measure voltage.
• ‒ Specification: 4,5 ... 5.5 V
• ‒ Connect multimeter between contacts 1 (positive) and 3 (signal) to measure voltage.

• ‒ Specification: 4,5 ... 5.5 V

If a specification is not met:

• ‒ → With the ignition switched off, use adapter V.A.G 1598/11 to connect test box V.A.G 1598 A to connector A only of engine control unit (control unit remains disconnected) .

• ‒ → Check for open circuit and short to earth/positive or earth in the following wiring connections:

• ‒ Rectify short circuit or open circuit if necessary.

=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder

Note:

Use only gold-plated contacts when repairing the contacts in the plug connectors for the knock sensors.

If no fault is detected in the wiring:

• ‒ → Connect voltage tester V.A.G 1527 B as follows:

• ‒ The LED should light up.

If the LED does not light up:

• ‒ Check wiring between contact 2 of connector and earth connection in wiring harness on right of engine compartment for open circuit and repair if necessary.

=> "Current Flow Diagrams, Electrical Fault Finding and Fitting Locations" binder

Note:

Use only gold-plated contacts when repairing the contacts in the plug connectors for the knock sensors.

• ‒ If the wiring is OK, fit a new engine control unit => Page 24-20.