TT L4-1.8L Turbo (BEA) (2004)
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Using adapter cables from the VAG1594 connector test kit, connect VAG1527 voltage tester to terminals 2 + 3 of disconnected connector.
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Operate starter and test ignition signal from Engine Control Module (ECM).
LED should flicker.
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Switch ignition off.
If LED flickers and voltage supply is OK:
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Replace ignition coils with power output stage
If LED does not flicker:
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Check wires
Checking wiring
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Connect test box to control module wiring harness, connect test box for wiring test. See: Computers and Control Systems/Testing and
Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool Connecting/With Generic Scan Tool/Test Box, Connecting For Wiring
Test
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Check wires between test box and 4-pin connector for open circuit according to wiring diagram.
Cylinder 1 terminal 3 + socket 102
Cylinder 2 terminal 3 + socket 95
Cylinder 3 terminal 3 + socket 103
Cylinder 4 terminal 3 + socket 94
Wire resistance: max: 1.5 Ohm
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Check wires for short circuit to each other.
If there is no malfunction in wire connections:
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Replace Engine Control Module (ECM).