S4 V8-4.2L (BHF) (2004)
Main Relay (Computer/Fuel System): Testing and Inspection
Motronic Engine Control Module (ECM) Voltage Supply Relay -J271-, Checking
Special Tools and Equipment
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V.A.G 1526A multimeter
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V.A.G 1594A connector test kit
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V.A.G 1598/31 test box
NOTE: The Motronic Engine Control Module (ECM) voltage supply relay -J271- supplies voltage to the ignition coils with power output stages
as well as the Engine Control Module (ECM) at pin 3 and a few additional components. With the ignition switched on, 12 Volts must be present at
the respective ignition coil connector, terminal 1.
Test requirement:
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Ignition switched off.
Test sequence