R32 4Motion V6-3.2L (CBRA) (2008)
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Main Relay (Computer/Fuel System): Testing and Inspection
Power Supply Relay, Terminal 30, B+, J317, Checking
Power Supply Relay, Terminal 30, B-, J317, 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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Fuse SA1 OK.
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Fuse SB23 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.
Power Supply Relay
Measure to
(terminal 30, B+) J317 socket
30
Engine Ground (GND)
Specified value: 12.5 V
If the specified value was not obtained:
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Check the Power Supply Relay (terminal 30, B+) J317 socket 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 Power Supply Relay (terminal 30, B+) J317 socket 85 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.
Power Supply Relay
Motronic Engine Control Module
(terminal 30, B+) J317 socket
(ECM) J623 electrical harness connector T121 or test box socket
86
23
Specified value: 1.5 ohms.
If the specified value was not obtained:
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Check the Power Supply Relay (terminal 30, B+) J317 socket 86 to the Motronic Engine Control Module (ECM) J623 electrical harness connector
T121 terminal 23 for an open circuit or a short to Battery (+).
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Check the electrical harness connector for damage, corrosion, loose or broken terminals.
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If necessary, repair the wiring connection.
