Testing signals from/to automatic gearbox — AUDI
Testing signals from/to automatic gearbox on Audi: factory workshop procedure for engines 1Z, ADR, AEB, AFF. Full factory text, tools and checks.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 36 workshop diagrams for 1Z
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
A - Gear change signal
This signal causes the ignition timing to be briefly retarded (torque reduction) during gearshifts in order to smooth out the jolts experienced when changing gear.
Read measured value block, Display Group 19, engine at idling speed=>Page
01-49
Read measured value block 19
⇒
860 rpm
2.20 ms
1 1
1
8.5 5before TDC
Indicated on display:
Observe readout in display zone 3.
Specified result: X 1 X
Caution
The V.A.G 1551 must be operated by a second person.
Take the vehicle for a test drive.
Read measured value block 19
⇒
860 rpm
2.20 ms
1 0
1
4.5 5before TDC
Observe display zone 3 during a gear change.
Specified result: X 0 X
If specified result is not attained:
Connect the V.A.G 1598/22 test box to the wiring harness for the engine control unit.
=>Page
24-6
.
The following wiring connections should 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
23 · => Circuit diagrams, Electrical Fault Finding and Installation Location binder
Rectify short circuit or open circuit if necessary.
B - Accelerator position signal
This signal is required for load-dependent calculation of the gearshift times.
The signal is monitored by the self-diagnosis function (fault memory, read measured value block) of the automatic gearbox control unit.
Checking signal
=> Automatic gearbox; Repair Group 01
Automatic gearbox
C - engine speed signal
This signal is required for calculating how to smooth out the gearshifts.
Checking signal
=> Checking engine speed signal, Page
24-84
D - Selector lever position signal
This signal is required for idling speed stabilization.
When a gear is selected, the idling speed is reduced in order to alleviate vehicle "creeping".
Read measured value block, Display Group 20, engine at idling speed=> Page
01-49
Read measured value block 19
⇒
860 rpm
Neutral
A/C-Low
Compr. OFF
Indicated on display:
Observe readout in display zone 2.
Specified result: Neutral
Operate the foot brake and engage a gear.
Read measured value block 19
⇒
860 rpm
Gear selected
A/C-Low
Compr. OFF
Specified result: Gear selected.
If specified result is not attained:
Connect the V.A.G 1598/22 test box to the wiring harness for the engine control unit.
=>Page
24-6
.
The following wiring connections should 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
22 · => Circuit diagrams, Electrical Fault Finding and Installation Location binder
Rectify short circuit or open circuit if necessary.
E - Signal for changing up or down
In conjunction with the signal for gear change, this signal tells the engine control unit whether the gearbox has changed up or down. This influences the ignition timing retardation.
The signal is monitored by the self-diagnosis function (fault memory, read measured value block) of the automatic gearbox control unit.
Checking signal
=> Automatic gearbox; Repair Group 01
Automatic gearbox
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.