Passat L4-1.8L Turbo (AWM) (2004)
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Check for open circuits in wires between test box and connector according to wiring diagram:
Terminal 1 + socket 92
Terminal 2 + socket 83
Terminal 3 + socket 117
Terminal 4 + socket 84
Terminal 5 + socket 118
Terminal 6 + socket 91
Wire resistance: max: 1.5 Ohms
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Also check wires for short circuit to each other.
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Also check wires for short circuits to B+ or Ground (GND).
If no malfunctions are found in wires:
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Check voltage supply of Engine Control Module (ECM).