audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

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Checking vehicle speed signal > < Checking signals from / to air conditioner

A3 Mk1

Diesel Direct Injection and Glow Plug System (TDI 4 cyl.) >07.99
Checking auxiliary signals
Testing clutch pedal switch

This signal is designed to prevent speed overshoots and jerkiness on switching from throttle open to throttle closed and vice versa when disengaging clutch. It is needed for the cruise control system.

  • ‒ Read measured value block, display group 06, engine not running .
 
→ Indicated on display:
Read measured value block 6    ⇒
    0 km/h    255    0    0    000000    0
  • ‒ Check display in display zone 2.
 
→ Specification: 0 X X
Read measured value block 6    ⇒
    0 km/h    255    0    0    000000    0
  • ‒ Depress clutch pedal.
 
→ Specification: 1 X X
Read measured value block 6    ⇒
    0 km/h    1    255    0    000000    0

If specified value is not attained:

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

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

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

Clutch pedal switch, contact

46

=> Current Flow Diagrams, Electrical Fault-finding and Fitting Locations
  • ‒ Rectify any open/short circuit as necessary.

Checking vehicle speed signal > < Checking signals from / to air conditioner