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Testing throttle valve potentiometer > < Performing adaption of throttle valve control part

A4 Mk1

Motronic injection and ignition system (6-cylinder)
Testing throttle valve control part
Testing idling speed switch

Special tools, testers and auxiliary items

  • ◆ Fault reader V.A.G 1551 (or vehicle system tester V.A.G 1552) with cable V.A.G 1551/3
  • ◆ Adapter set V.A.G 1594
  • ◆ Test box V.A.G 1598/22
  • ‒ Connect fault reader V.A.G 1551
    .
  • ‒ Switch on ignition.
  • ‒ Select "Read measured value block", Display Group 098, engine not running.
 
→ Indicated on display:
Read measured value block 98    ⇒
    4.420 V    3.880 V    Idling    ADP.O.K.
  • ‒ Check display in display zone 3.
 
→ Specification: Idling
Read measured value block 98    ⇒
    4.420 V    3.880 V    Idling    ADP.O.K.
  • ‒ Operate accelerator pedal.
 
→ Specification: Part throttle
Read measured value block 98    ⇒
    4.420 V    3.880 V    Part throt    ADP.O.K.

If the specification is not attained:

  • ‒ Switch off ignition.
  • ‒ Unplug connector from throttle valve control part.
  • ‒ Connect test box V.A.G 1598/22 to wiring harness for engine control unit
    => Page 24-24.
 
A23-0006
  • ‒ → Test for open circuit and short to positive or earth in the following wiring connections:

Contact on 8-pin connector on wiring harness

Socket on test box V.A.G 1598/22

3

69

7

67
  • ‒ Rectify any open/short circuit as necessary.

If no wiring fault is detected:

  • ‒ Fit a new throttle valve control part (J338).

Testing throttle valve potentiometer > < Performing adaption of throttle valve control part