Testing throttle valve positioner sender and throttle valve potentiometer — AUDI
Testing throttle valve positioner sender and throttle valve potentiometer on Audi: factory workshop procedure for engines ADP, ADR, AEB, AEH.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
📐 18 workshop diagrams for ADP
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
AKL
Testing sender voltage readings
Disconnect the 8-pin plug on the throttle valve control unit.
Switch the ignition on.
Measure voltage between contacts 4 and 7 on the 8-pin plug using hand held multimeter V.A.G 1526.
Specification: at least. 4.8 V.
If the value is as specified, reconnect the 8-pin plug.
Start the engine.
Select Read measured value block (function 08) and Display Group 98 =>Page
01-101
).
Read measured value block 98
⇒
1
2
3
4
Display readout:
The values in display zone 1 (throttle valve potentiometer voltages) should be between 3.70 and 4.75 volts.
The values in display zone 2 (throttle valve positioner potentiometer voltages) should be between 2.28 and 4.75 volts.
If the values are not as specified, switch off the ignition.
Connect test box V.A.G 1598/22 to wiring harness for engine control unit
=>Page
24-8
.
Disconnect the 8-pin connector on the throttle valve control unit.
Test for continuity between the test box and the 8-pin connector using multimeter V.A.G 1526.
Use the multimeter to test the wires for short circuits with each other.
Contact on 8-pin connector · Contact on test box
1 · 66
2 · 59
3 · 69
4 · 62
5 · 75
7 · 67
8 · 74
Rectify any open circuits and remove any dirt that may be on the contacts. Erase fault memory and perform adaptation of throttle valve control unit => Page
24-69
.
If the value is still not as specified, check the throttle valve for dirt or stiffness and clean if necessary.
Repeat adaptation of throttle valve control unit =>Page
24-69
.
If it is not possible to start the adaptation or if the adaptation cannot be completed, fit a new throttle valve control unit.
Perform adaptation of throttle valve control unit =>Page
24-69
.
If it is not possible to start the adaptation or if the adaptation cannot be completed, fit a new engine control unit => Page
24-10
.
If it is not possible to complete the adaptation with the new engine control unit, try performing the adaptation again with the old throttle valve control unit that was removed => Page
24-69
.
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.