Service & Repair Manual

24-74
Checking activation
If LED does not blink or if it remains constantly lit:
- Connect VAG1527B voltage tester between terminals 1 and 2
- Initiate output Diagnostic Test Mode Page 01-56 and activate the
intake manifold change-over valve.
LED must blink.
- Connect VAG1598/31 test box at wiring harness to ECM, do not
connect ECM Page 24-17 .
- Check the following wire connection for open circuit and short circuit to
Ground (GND) and B+:
Harness connector
Terminal
VAG1598/31 test box
Socket
2 104
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