A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
2
Engine ground
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Operate starter briefly.
Specified value: approx. battery voltage (B+)
If specified value is not obtained:
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Check wiring from terminal 2 on connector via fuse to fuel pump relay for open circuit or short to ground:
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Repair any open/short circuit as necessary.
If specified value is obtained:
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Connect hand-held multimeter to terminals 2 and 3 of connector to measure voltage.
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Operate starter briefly (engine may start).
Specified value: approx. battery voltage (B+)
NOTE: Engine control module ground (GND) is present at terminal 3 of the connector.
If specified value is not obtained:
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Check wiring
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Connect hand-held multimeter to terminals 3 and 4 of connector to measure voltage.
Specified value: approx. 5 V
If specified value is not obtained:
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Check wiring
Wiring to Mass Air Flow (MAF) sensor -G70-, checking
NOTE: The signal wire is also checked during the wiring check.
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Connect test box V.A.G 1598/31 to wiring harness for Engine Control Module (ECM); do not connect Engine Control Module (ECM). See:
Computers and Control Systems/Testing and Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/With Generic Scan Tool/Scan Tool
Connecting/Test Box, Connecting For Wiring and Component Test