Checking ignition coils and output stages on vehicles with engine code "“AJK”", "“ARE”" and "“AZA”" — AUDI

🧭 Before you start

Fits: Audi A6 C5 (4B)

• Special tools named: V.A.G 1598/31
• Renewed: spark plug connector, spark plug, ignition coil, output stage

Don't miss

• The spark plug connector can be detached from the ignition coil.
• Disregard (item 1).
• Output stage N122 (black connector) activates the ignition coils for cylinder bank 1 (cylinders 1 to 3).Output stage N192 (brown connector) activates the ignition coils for cylinder bank 2 (cylinders 4 to 6).
• Disconnect electrical connectors on all six injectors to ensure no fuel is injected during the test, as this could damage the catalytic converter.
• Connect adapter cable, 121-pin V.A.G 1598/31 (test box) to wiring harness to engine control unit, but do not connect actual engine control unit .

🔧 Engine codes this applies to

📋 Procedure

1. Check misfiring detection on vehicles with engine code "“ARE”" and "“AZA”".
2. Continue with testing at cylinder indicated ⇒ "“When defective cylinder has been identified”".
3. With engine running, unplug connectors at injectors one after the other and observe how the engine runs.
4. Or compare the spark plugs of all cylinders, and look for soot deposits on electrodes.
5. Connect multimeter to spark plug connector to measure resistance. [Note: The spark plug connector can be detached from the ignition coil.]

6. Renew spark plug connector.
7. Exchange spark plug of defective cylinder with that of another cylinder. Before exchanging spark plug, perform visual check of spark plug for damage (ceramic section of spark plug may have cracked).
8. Renew the spark plug.
9. Exchange ignition coil of defective cylinder with that of another cylinder. Before fitting the ignition coil, check it for damage (the ignition coil may be cracked or ruptured).
10. Renew ignition coil.
11. Check earth connections.
12. Unplug 3-pin electrical connector on ignition coil.
13. Use current flow diagram to check earth connection between contact (4a) of connector and earth for open circuit and short to positive.
14. Repair wiring connection if necessary.
15. Connect multimeter (voltage measuring range) between contact (15) of connector and earth.
16. Unplug electrical connector at injector of cylinder to be checked.
17. Operate starter.
18. Use current flow diagram to check wiring for open circuit and short to positive.
19. Unplug 3-pin electrical connectors (2) on output stages for ignition coils. [Note: Disregard (item 1).]
20. Consecutively connect voltage testerV.A.G 1527 B between contacts (1), (2) and (3) on 3-pin connectors of both output stages and earth. Then operate starter for a few seconds.
21. Switch off ignition.
22. Check for open circuit and short to positive or earth in the following wiring:
23. Repair wiring connection if necessary. [Note: Output stage N122 (black connector) activates the ignition coils for cylinder bank 1 (cylinders 1 to 3).Output stage N192 (brown connector) activates the ignition coils for cylinder bank 2 (cylinders 4 to 6).]
24. Disconnect electrical connectors on all six injectors to ensure no fuel is injected during the test, as this could damage the catalytic converter.
25. Unplug 4-pin electrical connectors (2) on output stages for ignition coils. [Note: Disregard (item 1).]
26. Consecutively connect voltage testerV.A.G 1527 B between contacts (1), (3) and (4) on 4-pin connectors of both output stages and earth. Then operate starter for a few seconds.
27. Switch off ignition.
28. Connect adapter cable, 121-pin V.A.G 1598/31 (test box) to wiring harness to engine control unit, but do not connect actual engine control unit .
29. Check for open circuit and short to positive or earth in the following wiring:
30. Repair wiring connection if necessary.
31. Connect 4-pin connectors (2) to both output stages. [Note: Disregard (item 1).]
32. Disconnect 3-pin connectors from output stages.
33. Consecutively connect voltage testerV.A.G 1527 B between contacts (1), (2) and (3) on 3-pin connectors of both output stages and battery plus (+). Then operate starter for a few seconds.
34. Disconnect 4-pin connectors from output stages; fitting locations .
35. Consecutively connect voltage testerV.A.G 1527 B between contact (2) on 4-pin connectors of both output stages and battery plus (+).
36. Use current flow diagram to check wiring for open circuit.
37. Renew output stage. [Note: Before installing, apply a coat of heat conductor pasteG 052 170 A1 to the metallic side of the new output stage. The function of the paste is to prevent corrosion between the output stage and the threaded mounting and to conduct away the heat generated by the output stage.]

Other AUDI procedures

• Removing and installing cylinder head cover (left-side) – Audi · 1 torque figures
• Removing cylinder head (right-side) – Audi A8 D2
• Checking air mass meter G70 – Audi A6 C5
• Checking Lambda probes and Lambda control before catalytic converter
• Checking camshaft control valves (solenoid valves) – Audi
• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures