Checking activation of secondary air pump relay J299: VW Golf IV / Bora 1.6 (AEH, AKL, APF)

🧭 Before you start

Fits: VW Golf IV / Bora (1J)

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• Pull 2-pin connector (arrow) off secondary air pump motor V101 and connect diode test lampV.A.G 1527B using adapter cables from adapter setV.A.G 1594A to disconnected connector. The LED must flash.
• If tools are necessary to pull relays or control units out of the relay plate, first disconnect battery earth strap.Before disconnecting battery earth strap obtain code for radios with anti-theft coding.
• Connect voltage testerV.A.G 1527B to contacts 3 and 4 of relay plate using adapter cables from adapter setV.A.G 1594A: LED must flash.
• Connect voltage testerV.A.G 1527B to contact 3 of relay plate and body earth using adapter cables from adapter setV.A.G 1594A: LED must flash.

🔧 Engine codes this applies to

📐 20 workshop diagrams for AEH

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

📋 Procedure

1. Connect 121-pin adapter cableV.A.G 1598/31 to control unit wiring harness. The engine control unit is also connected.
2. Bridge test box sockets 72 and 2 using adapter cables from adapter setV.A.G 1594A.
3. Then switch ignition on and select engine control unit with "“Address word”" 01.
4. Operate fault reader taking into account the information on the display:
5. Press keys 0 and 3 for function "“Final control diagnosis”".

6. Activate fuel pump relay J17.
7. Confirm entry with Q key. [Note: Bridging test box sockets 72 and 2 when activating the fuel pump relay J17 also activates the secondary air pump relay J299 (in protective housing for relays). It must click and the secondary air pump motor V101 must run at intervals.]
8. Pull 2-pin connector (arrow) off secondary air pump motor V101 and connect diode test lampV.A.G 1527B using adapter cables from adapter setV.A.G 1594A to disconnected connector. The LED must flash.
9. Renew secondary air pump motor V101:
10. Check wire between 2-pin connector contact 1 and body earth for open circuit.
11. Pull secondary air pump relay J299(arrow) off relay plate in protective housing for relays. [Note: If tools are necessary to pull relays or control units out of the relay plate, first disconnect battery earth strap.Before disconnecting battery earth strap obtain code for radios with anti-theft coding.]
12. Check wire for open circuit between secondary air pump motor V101 contact 2 and contact 2 of relay plate referring to current flow diagram.
13. Check voltage supply (terminal 30) for secondary air pump relay J299 referring to current flow diagram.
14. Renew secondary air pump relay J299.
15. Pull secondary air pump relay J299(arrow) off relay plate. [Note: If tools are necessary to pull relays or control units out of the relay plate, first disconnect battery earth strap.Before disconnecting battery earth strap obtain code for radios with anti-theft coding.]
16. Connect voltage testerV.A.G 1527B to contacts 3 and 4 of relay plate using adapter cables from adapter setV.A.G 1594A: LED must flash.
17. Renew secondary air pump relay J299.
18. Connect voltage testerV.A.G 1527B to contact 3 of relay plate and body earth using adapter cables from adapter setV.A.G 1594A: LED must flash.
19. Check wire between contact 3 of relay plate and fuse 43 for open circuit referring to current flow diagram.
20. Disconnect 121-pin adapter cableV.A.G 1598/31 from engine control unit. The wiring harness remains connected.
21. Remove bridge between test box sockets 72 and 2.
22. Check wire for open circuit between test box socket 72 and contact 4 of relay plate referring to current flow diagram. Wire resistance: max. 1.5 Ω.
23. Check wiring additionally for short circuit to battery positive or earth..
24. Renew engine control unit 24.

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