Checking ignition transformer output stage — VW

🧭 Before you start

• Renewed: ignition transformer

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• Operate starter and check ignition signal from Motronic control unit. LED must flicker.

📋 Procedure

1. Pull 3 pin connector off ignition transformer.
2. Connect multimeter to measure voltage with aux cables from adapter setV.A.G 1594 to the contact 1 + 3 of the disconnected plug.
3. Switch on ignition. Specification: min. 11 V
4. Switch off ignition.
5. Check wiring between 3 pin connector contact 1 and earth for open circuit according to current flow diagram. Wire resistance: max. 1.5 Ω

6. Check wire between 3 pin connector contact 3 and relay plate for open circuit according to current flow diagram. Wire resistance: max. 1.5 Ω
7. Connect diode lampV.A.G 1527 with aux. cables from adapter setV.A.G 1594 and adapterV.A.G 1594/15 to contact 2 + 3 of the plug.
8. Operate starter and check ignition signal from Motronic control unit. LED must flicker.
9. Switch of ignition.
10. Connect test boxV.A.G 1598/18 to control unit wiring loom.
11. Check wire between test box socket 24 + 3 pin connector contact 2 for open circuit according to current flow diagram. Wire resistance: max. 1.5 Ω.
12. Additionally check wires for short to one another. Specification: ∞ Ω.
13. Replace Motronic control unit J220.
14. Replace ignition transformer.

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