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Testing throttle valve potentiometer > < Adaptation of the throttle valve control unit to the engine control unit

A4 Mk1

Motronic fuel injection and ignition system (4-cyl.turbo) > 07.96
Testing throttle valve control unit
Testing idling switch
  • ‒ Read measured value block, Display Group 98, engine stopped =>Page 01-49
 
→ Indicated on display:
Read measured value block 98    ⇒
    4.420 V    3.880 V    Idle    ADP. OK
  • ‒ Check readout in display zone 3.
 
→ Specified result: Idling speed.
Read measured value block 98    ⇒
    4.420 V    3.880 V    Idle     ADP. OK.
  • ‒ Operate accelerator.
 
→ Specified result: Part load.
Read measured value block 98    ⇒
    4.420 V    3.880 V    Part load     ADP. OK.

If specified result is not attained:

  • ‒ Switch off ignition.
 
A23-0006
  • ‒ → Disconnect the connector from the throttle valve control unit.
  • ‒ Connect the V.A.G 1598/22 test box to the wiring harness for the engine control unit.
    =>Page 24-6.
 
A23-0006

The following wiring connections should be checked for open circuits and/or short to positive or negative:

8-pin connector on the wiring harness, contact.

Test box V.A.G 1598/22, socket.

3

69

7

67
  • ‒ Rectify short circuit or open circuit if necessary.

If no fault is detected in the wiring:

  • ‒ Renew the throttle valve control unit (J338).

Testing throttle valve potentiometer > < Adaptation of the throttle valve control unit to the engine control unit