Checking injection timing control range: Audi A4 B5 2.5 TDI (ACV, AFB, AHY, AJT, …)

🧭 Before you start

Fits: Audi A4 B5 (8D)

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• Coolant temperature must be at least 85°C.

🔧 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. Start engine.
2. Coolant temperature must be at least 85°C.
3. Start basic setting function, Display group 04, engine running at idling speed.
4. Check readouts in display zones 2 and 3.
5. Check tank for petrol or biodiesel; if this is the case: drain tank and fill with diesel, erase fault memory and perform road test, then interrogate fault memory again

6. Check and adjust commencement of injection
7. Drain fuel filter
8. Check fuel system for leaks .
9. Eliminate air in fuel system
10. Interrogate and, if necessary, erase fault memory. Perform road test and repeat test.

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