R32 4Motion V6-3.2L (CBRA) (2008)
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Main Relay (Computer/Fuel System): Testing and Inspection
Motronic Engine Control Module Power Supply Relay J271, Checking
Motronic Engine Control Module Power Supply Relay J271, Checking
Special tools, testers and auxiliary items required
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Multimeter.
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wiring diagrams.
Test requirements
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The Motronic Engine Control Module (ECM) J623 fuses OK.
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Fuse SA1 OK.
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Fuse SA5 OK.
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The Ground (GND) connections at the engine and transmission OK.
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The battery voltage at least 12.5 V.
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The generator OK.
Test procedure
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Perform a preliminary check to verify the customers complaint. See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check
Start diagnosis
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Using a Multimeter, check the following wiring connection for voltage.
Motronic Engine Control
Measure to
Module (ECM) Power Supply
Relay J271 socket
1/30
Engine Ground (GND)
Specified value: 12.5 V
If the specified value was not obtained:
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Check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 1/30 to the Battery A positive for an open circuit or short to
Ground (GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
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Using a Multimeter, check the following wiring connection for voltage.
Specified value: 12.5 V
If the specified value was not obtained:
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Check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 3/86 to Battery A positive for an open circuit or short to
Ground (GND).
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Check the electrical harness connectors for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
If no malfunctions are found in the wiring:
Checking Ground (GND)
If the manufacturers test box is being used. Perform the following step.
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Install the test box.
If the manufacturers test box is not being used. Perform the following step.
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Remove the Engine Control Module (ECM) J623.
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Using a Multimeter, check the following wiring connection for resistance.
Motronic Engine Control
Motronic Engine Control Module
Module (ECM) Power Supply
(ECM) J623 electrical harness
Relay J271 socket
connector T121 or test box socket
