Checking engine speed sender G28: Audi A8 D2 (ACV, AFB, AHY, AJK, …)

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Special tools named: V.A.G 1594/1, V.A.G 1598/30
• Renewed: engine speed sender

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• There must not be any swarf or damage at engine speed sender/sender wheel.
• Thickness of spacer between sender and gearbox must be 4.5 mm.
• The resistance value for the engine speed sender is based on a temperature of 20 °C.As the temperature increases, so does the resistance.

🔧 Engine codes this applies to

📐 20 workshop diagrams for ACV

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Check proper installation and attachment of sender before performing test.
2. There must not be any swarf or damage at engine speed sender/sender wheel.
3. Thickness of spacer between sender and gearbox must be 4.5 mm.
4. Unplug connector of engine speed sender (identification: grey connector).
5. Connect V.A.G 1526B;Handmultimeter (resistance measuring range) with test lead from V.A.G 1594/1;Messleitungen to contacts 2 and 3 of engine speed sender connector. [Note: The resistance value for the engine speed sender is based on a temperature of 20 °C.As the temperature increases, so does the resistance.]

6. Replace engine speed sender.
7. Connect V.A.G 1526B;Handmultimeter (resistance measuring range) between contacts 2 and 1 (earth) as well as to contacts 3 and 1 (earth).
8. Replace engine speed sender.
9. Check wiring between sender connector and diesel direct injection system control unit J248 as follows:
10. Connect test box V.A.G 1598/30 to wiring harness to diesel direct injection system control unit J248.
11. Check for open circuit and short to earth or positive in the following wiring:
12. Eliminate open circuit in wiring or short circuit if necessary.
13. Slowly crank engine and check concentricity/firm attachment of sender wheel.
14. If none of the preceding checks has revealed any faults, replace diesel direct injection system control unit J248.

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