Checking voltage supply for diesel direct injection system — AUDI

🧭 Before you start

Fits: Audi A4 B5 (8D)

• Special tools named: V.A.G 1598/30, V.A.G 1598/31

Don't miss

• Connect test adapter V.A.G 1598/30 or V.A.G 1598/31 to wiring harness for engine control unit. Do not connect engine control unit .
• The clicking of the relay is difficult to hear and is therefore best checked by touching the relay.

🔧 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. Connect test adapter V.A.G 1598/30 or V.A.G 1598/31 to wiring harness for engine control unit. Do not connect engine control unit .
2. Switch on ignition.
3. Connect multimeter (voltage test range) between the following contacts on the test adapter:
4. Check the wiring .
5. Switch on ignition. Specification: diesel direct injection system relay J322 should pick up. (Relay is located in relay and fuse holder in electronics box in plenum chamber, relay position 3). [Note: The clicking of the relay is difficult to hear and is therefore best checked by touching the relay.]

6. Switch off ignition.
7. Connect test adapter V.A.G 1598/30 or V.A.G 1598/31 to wiring harness for engine control unit. Do not connect engine control unit .
8. Using a test lead from auxiliary measuring setV.A.G 1594C, connect together the following sockets on the test adapter.
9. Renew diesel direct injection system control unit.
10. Switch off ignition.
11. Unplug diesel direct injection system relay J322 from relay socket (relay position 3 on relay and fuse holder in electronics box).
12. Rectify open circuit or short circuit in wiring as necessary .
13. Switch off ignition.
14. Unplug diesel direct injection system relay J322 from relay socket (relay position 3 on relay and fuse holder in electronics box in plenum chamber).
15. Connect hand-held multimeter (voltage test range) between the following contacts on the relay socket:
16. Check the wiring .
17. Refit relay in relay socket (relay position 3 on relay and fuse carrier in electronics box in plenum chamber).
18. Unplug connector from injection pump.
19. Connect test adapter V.A.G 1598/30 or V.A.G 1598/31 to wiring harness for engine control unit. Do not connect engine control unit .
20. Using a test lead from auxiliary measuring setV.A.G 1594C, connect together the following sockets on the test adapter.
21. Connect multimeter (voltage test range) between the following contacts on the test adapter:
22. Connect hand-held multimeter (voltage test range) between the following contacts on the wiring harness connector:
23. Check the wiring .

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