A4 Cabriolet L4-1.8L Turbo (AMB) (2005)
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Disconnect voltage supply relay -3-.
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Check the following wire connection for open circuit according to wiring diagram:
Relay carrier in E-box,
Harness connector at ignition
plenum chamber, position
coils Terminal
3 Terminal
8
1
Specified value: Wire resistance max 1.5 Ohms
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If necessary, repair wire connection.
If no malfunctions are found in wires:
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Check voltage supply of Motronic Engine Control Module (ECM) voltage supply relay -J271-
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Check activation of Motronic Engine Control Module (ECM) voltage supply relay -J271-
Checking voltage supply
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Connect multimeter for voltage measurement as follows.
Relay carrier in E-box,
Measure to
plenum chamber, position
3 Terminal
1
Engine Ground (GND)
2
Engine Ground (GND)
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Specified value: approx. battery voltage
If specified value is not obtained:
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Check wire connections for open circuit according to wiring diagram.
Specified value: Wire resistance max 1.5 Ohms
Checking activation