S6 V8-4.2L (BBD) (2004)
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Harness connectors at ignition coils disconnected
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Disconnect all harness connectors from all fuel injectors.
NOTE: Fuel must not be injected during the test to avoid damaging catalytic converter.Connectors must therefore be disconnected from fuel injectors.
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Connect e.g. V.A.G 1527 B voltage tester to connector terminals 2 and 3.
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Operate starter briefly.
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LED must blink (brief blink signal).
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Switch ignition off.
If LED does not blink:
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Connect test box to wiring harness of Engine Control Module (ECM); ECM is not connected. 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 the following wire connections for open circuit according to wiring diagram:
Harness connector
Test box
Terminal 3
Socket
Cyl. 1
102
Cyl. 2
7
Cyl. 3
111
Cyl. 4
94
Cyl. 5
103
Cyl. 6
110
Cyl. 7
8
Cyl. 8
95
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Specified value: Wire resistance max 1.5 Ohm
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Also check wires for short circuit to each other as well as to B+ and Ground (GND).
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Specified value: infinity Ohm (no continuity)
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If necessary, repair wire connection.
If no malfunctions are found in wires:
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Replace the combined component, ignition coil with power output stage.
Final procedures
After repair work, the following work steps must be performed in the mentioned sequence: