S6 V8-4.2L (BBD) (2004)
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Test wiring from socket 2 on connector via fuse to fuel pump relay for open circuit or short to Ground. Correct, if necessary.
If the specified value is achieved:
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Check Ground supply to engine control module.
Checking Ground connection
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Connect hand-held multimeter for voltage measuring to sockets 2 and 3 of connector.
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Operate starter briefly.
Specified value: approx. battery voltage
NOTE: Engine control module Ground is present at socket 3 of the connector.
If specified value is not attained:
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Check wiring connections.
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Connect hand-held multimeter for voltage measuring to sockets 3 and 4 of connector.
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Switch ignition on.
Specified value: approx. 5 V.
If specified value is not attained:
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Check wiring connections.
Checking wiring to MAF sensor
NOTE: The signal wire is also checked during the wiring check.
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Connect test box VAG 1598/31 to wiring harness for engine control module; engine control module must not be connected. See: Computers and
Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Manufacturer's Scan Tool/Scan Tool
Connecting and Initial Checks/Connecting VAG 1598/31 Test Box