A8L V8-4.2L (BFM) (2004)
Main Relay (Computer/Fuel System): Testing and Inspection
Motronic Engine Control Module (ECM) Power Supply Relay -J271- (Main Relay), Checking
Motronic Engine Control Module (ECM) Power Supply Relay -J271- is located in electronics box in plenum chamber, relay position 2.
NOTE:
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This test is only for vehicles up to m.y. 2004.
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Vehicles as of m.y. 2005, check Motronic Engine Control Module (ECM) Power Supply Relay -J271- according to wiring diagram.
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Disconnect voltage supply relay -2-.
Checking voltage supply
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Connect multimeter for voltage measurement as follows.
Relay carrier in E-box, plenum
Measure to
chamber, position 2 Terminal
1
Engine Ground (GND)
2
Engine Ground (GND)
Specified value: approx. battery voltage
If specified value is not obtained:
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Repair open circuit in wiring or short circuit if necessary.
Checking activation