Jetta L4-1.8L Turbo (AWP) (2004)
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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:
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Vehicles with engine code AWD, item 3,
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Vehicles with engine code AWP, AWW, item 2.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data. See: Computers and Control
Systems/Testing and Inspection/Scan Tool Testing and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
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
Vehicles with engine code AWD
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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 Ohms
Vehicles with engine code AWP, AWW
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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 Ohms
Continuation for all vehicles
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Check wires for short circuit to each other.