Audi Workshop Service and Repair Manuals

The adaption teaches the engine control unit the various positions of the throttle unit when the ignition is switched on and the engine is not running. These positions are stored in the control unit. The feedback of the throttle valve position is via both angle senders for throttle valve drive.

Adapting sequence must be performed if:

• ◆ The voltage supply is interrupted
• ◆ The throttle valve control unit is removed and installed
• ◆ The throttle valve control unit is renewed
• ◆ If when installing another engine another throttle valve control unit is installed

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3

Test conditions

• ● No faults must be stored in fault memory
  , interrogating fault memory
• ● The battery voltage must be at least 11.5 V.
• ● Engine not running; ignition switched on.
• ● The accelerator pedal must not be depressed.
• ● The throttle valve must be at idling speed position.
• ● Coolant temperature must be 5...95 °C =>display group 04, display zone 3.
• ● The cruise control system must be functioning correctly if installed.

Work sequence

• ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.
  (Connecting fault reader and selecting engine control unit
  => Page 01-13.)

• ‒ Press keys 0 and 4 for the function "Introduction of basic setting" and confirm entry with Q key.

• ‒ Press keys 0, 6 and 0 for the "Display group number 60" and confirm entry with Q key.

After pressing the Q key the throttle valve positioner is switched so that it is not supplied with voltage at start of test.

In this condition the throttle valve is pulled into an emergency running position by a mechanical spring in the throttle valve control part. The values that both angle senders provide in the emergency running position are stored by the engine control unit.

Thereafter the throttle valve is opened a predetermined value. If this value is achieved, the throttle valve is again switched so that it is not supplied with voltage. Now the mechanical spring must pull the throttle valve to the previously learnt emergency running position within a predetermined period (spring test).

Then the throttle valve is closed by the throttle valve positioner and the values which are supplied by the angle senders in the throttle valve control part are stored by the engine control unit.

If the engine control unit switches the throttle valve positioner so that it is without voltage during normal operation, this is indicated by the increased and hunting idling speed. The engine reacts slowly to accelerator changes.

Adapting has been performed successfully.

To store the values:

• ‒ Switch ignition off for at least 30 seconds.

Note:

If the basic setting of the control unit is interrupted, the cause could be one of the following:

• ◆ Throttle valve cannot reach the mechanical idling stop because of obstructions such as oil deposits.
• ◆ Battery voltage too low.
• ◆ Throttle valve control unit or wiring is defective. Check => Page 24-49.

A fault will be stored in the fault memory if the adaption procedure is interrupted. However, you should still check whether the basic setting or adaption of the throttle valve control part has been performed successfully. The basic setting will be performed again automatically the next time the ignition is switched on.

• ‒ End the engine basic setting by pressing the⇒ key.
• ‒ Press keys 0 and 6 for the function "End output" and confirm entry with the Q key.