Checking terminal 30 voltage supply relay (diesel direct injection system control unit 2J494) — AUDI

🧭 Before you start

Fits: Audi A8 D2 (4D)

• Special tools named: V.A.G 1598/30

🔧 Engine codes this applies to

📋 Procedure

1. Connect test box V.A.G 1598/30 to wiring harness to engine control unit 2 J494.
2. Connect portable multimeter (voltage measuring range) to socket 4/26 of test box and earth.
3. Switch on ignition.
4. Check wiring.
5. Connect portable multimeter (voltage measuring range) to socket 1/07 of test box and earth.

6. Switch on ignition.
7. Check wiring.
8. Switch on ignition.
9. Connect portable multimeter (voltage measuring range) to the following contacts of test box V.A.G 1598/30.
10. Check wiring (see the separate procedure).
11. Replace terminal 30 voltage supply relay J317 (micro-central electrics in electronics box in passenger's footwell, relay position 4).

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