A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
If specified values are obtained.
Checking activation of Fuel Pump (FP) relay
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Remove cable bridge.
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Remove Fuel Pump (FP) relay.
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Connect test box to wiring harness of 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
ECM is not connected.
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Check the following wire connection for open circuit according to wiring diagram.
9-pin relay carrier in driver's
Test box Socket
footwell, left side,
position 1 Terminal
5
65
Specified value: Wire resistance max 1.5 Ohms
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Check the wire for short circuit to B+ and Ground (GND).
Specified value: Infinite Ohms(no continuity)
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If necessary, repair wire connection.
If no malfunctions are detected:
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Replace Fuel Pump (FP) Relay -J17-.
or
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Replace Engine Control Module (ECM).
Check voltage supply for Fuel Pump (FP) and components
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Remove fuses S228, S232, and S234 (positions 28, 32, and 34) from fuse holder.
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Connect multimeter for voltage measurement to Ground (GND) and to one terminal of the following fuses in the fuse holder.
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Operate starter briefly.
Fuse
Specified value at one of the terminals