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Testing engine speed signal > < Testing signals from and to automatic gearbox

A4 Mk1

TDI Injection and Glow Plug System (4-cyl.) 07.97 > 07.99
Testing signals from and to automatic gearbox
Testing gearshift signal

This signal causes the injection quantity to be briefly reduced (torque reduction) during gearshifts in order to smooth out the jolts experienced when changing gear.

  • ‒ Connect fault reader V.A.G 1551 (V.A.G 1552) and select the engine electronics control unit using "Address word" 01. When doing this the engine must be running at idling speed.
    (Connecting fault reader and selecting engine electronics control unit .)
 
→ Indicated on display:
Rapid data transfer     HELP
Select function XX
  • ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.
 
→ Indicated on display:
Read measured value block HELP
Enter display group number XXX
  • ‒ Press keys 0, 0 and 9 for "display group number 9" and confirm entry with Q key.
 
→ Indicated on display:
Read measured value block 9        ⇒
    1    2    3    4
  • ‒ Check display in display zone 3.
  • Specified value: 51 mg/stroke
  • ‒ Perform a road test.
Important:
Secure fault reader to the rear seat and operate from this location. When doing this, always observe the relevant safety precautions Page 23-1.
  • ‒ Accelerate the vehicle from a stationary position with full throttle, but without using kick down.
 
→ Observe display zone 3 when vehicle changes into 2nd gear.
Read measured value block 9        ⇒
    1    2    3    4
  • Specified value: display should drop briefly below 51 mg/stroke

Note:

Because of the lag in data transfer, there might be a delay before the display reaches the specified value.

If specified value is not attained:
 
N24-0567
  • ‒ → 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

Automatic gearbox control unit, contact

36

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

Testing engine speed signal > < Testing signals from and to automatic gearbox