Testing engine speed sender -G28 — AUDI
Testing engine speed sender -G28 on Audi: factory workshop procedure for engines 1Z, ADR, AHU, AJM. Full factory text, tools and checks.
Workshop procedure for AUDI — the factory write-up, straight from real workshop data.
🔧 Engine codes this applies to
📋 Procedure
ARG AVV
Notes:
The engine speed sender is a combined speed sender and reference mark sender.
Without a signal from engine speed sender -G28 the engine cannot be started.
If the signal from engine speed sender -G28 fails while the engine is running, the engine will cut out immediately.
Testing engine speed sender
Fitting location of sender and connector
=> Page
24-5
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Before carrying out the test, make sure that the sender is correctly installed and firmly seated.
Check for damage or metal particles on sender and sender wheel.
Unplug connector for engine speed sender (grey connector).
Connect hand-held multimeter V.A.G 1526 A (resistance test range) to contacts 1 and 2 on connector in connector support bracket using test lead from V.A.G 1594.
Specification: approx. 450...1000 ω
Notes:
The resistance value for the engine speed sender is based on a temperature of 20 °C.
The resistance increases as the temperature rises.
If the specification is not attained:
Fit a new engine speed sender.
If the specification is attained:
Connect hand-held multimeter V.A.G 1526 (resistance test range) between contacts 2 and 3 (earth) and between contacts 1 and 3 (earth).
Specification: ∞ω (infinity / open circuit) in each test
If the specification is not attained:
Fit a new engine speed sender.
If the specification is attained:
Test the wiring between the sender connector and the engine control unit as follows:
Connect test box V.A.G 1598/31 to wiring harness for engine control unit. Do not connect to the engine control unit itself.
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Test wiring connection from 3-pin connector (sender connector) ...
... to engine control unit for open circuit and/or short circuit to positive or earth.
3-pin connector on wiring harness, socket · Test box V.A.G 1598/31, socket
1 (signal wire) · 82
2 (earth wire) · 90
3 (screening) · 108
Resistance in wiring: max. 1.5 ω
=> Current flow diagrams, Electrical fault finding and Fitting locations binder
Rectify any open/short circuit as necessary.
If no fault is found in the wiring:
Slowly rotate the engine and check that sender wheel has no run-out and is securely mounted.
If no faults have been found in any of the tests so far, fit a new engine control unit =>Page
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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.