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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.) 07.96ä
Checking throttle valve control unit
Testing idling switch
  • ‒ Read measured value block, Display Group 98, engine stopped
 
→ Indicated on display:
Read measurement block 98    ⇒
    4.420 V    3.880 V    Idle     ADP. OK.
  • ‒ Check display in display zone 3.
 
→ Specification: Idling
Read measurement block 98    ⇒
    4.420 V    3.880 V    Idle     ADP. OK.
  • ‒ Press accelerator pedal.
 
→ Specification: Part load
Read measurement block 98    ⇒
    4.420 V    3.880 V    Part load     ADP. OK.

If the specification is not obtained:

  • ‒ Switch off ignition.
 
A23-0006
  • ‒ → Disconnect the connector from the throttle valve control unit.
  • ‒ Connect test box V.A.G 1598/22 to wiring harness for engine control unit
    .
 
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 any open/short circuit as necessary.

If no wiring fault is detected:

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

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