Audi Workshop Service and Repair Manuals

The throttle valve potentiometer (G69) informs the engine control unit of the position of the throttle valve.

Test conditions

• ● Check the throttle cable setting

=> 4-cylinder engine, mechanical components; Repair Group 20

• ‒ Switch on the ignition.
• ‒ Select the function "Reading measured value block" (function 08) and Display Group 01
  

• ‒ Check display in display zone 3.

• ‒ Slowly depress accelerator pedal.

If either the initial or the final specification is not achieved:

• ‒ Check the power supply.

If the display does not change or only changes irregularly:

• ‒ Check the wiring
  .

Check the power supply to the throttle valve control unit

• ‒ Unplug the connector from the throttle valve control unit.
• ‒ → Connect the V.A.G 1526 hand held multimeter for voltage measurement to contact 4 of the connector and the earth.
• ‒ Switch on the ignition.

• Specified value: approx 5 V

Check wiring

• ‒ Switch the ignition off.
• ‒ Connect the V.A.G 1598/22 test box to the wiring harness for the engine control unit
  .

The following wiring should be checked for a short to positive or negative and an open circuit:

• ‒ If necessary, rectify open circuit or short circuit.

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

If no wiring fault is detected:

• ‒ Test sensor for throttle valve positioner
  => Page 24-74.