A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
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Connect multimeter for voltage measurement as follows.
Relay carrier in E-box,
Measure to
plenum chamber, position
3 Terminal
4
B+
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Switch ignition on.
Specified value: approx. battery voltage
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Switch ignition off.
If specified value is not obtained:
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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.
Relay carrier in E-box,
Test box Socket
plenum chamber, position
3 Terminal
4
23
Specified value: Wire resistance max 1.5 Ohms
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Also 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 Motronic Engine Control Module (ECM) voltage supply relay -J271-.