Passat Sedan V6-3.6L (BLV) (2008)
Engine Control Module: Testing and Inspection
Voltage Supply, Checking
Voltage Supply, Checking
Special tools, testers and auxiliary items required
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Multimeter.
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Wiring diagram.
Test requirements
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The Motronic Engine Control Module (ECM) J623 fuses OK.
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Battery voltage at least 12.5 volts.
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All electrical consumers such as, lights and rear window defroster, switched off.
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Vehicles with automatic transmission, selector lever in position "P" or "N".
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A/C switched off.
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Ground (GND) connections between engine/transmission/chassis OK.
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Ignition switched off.
Test procedure
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Perform a preliminary check to verify the customers complaint. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Scan Tool Testing and Procedures/Preliminary Check
Start diagnosis
Test sequence
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Remove the Motronic Engine Control Module (ECM) Power Supply Relay J271.
Checking voltage
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 30 to Ground (GND).
Specified value: battery voltage.
If the specified value was not obtained:
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Check the wiring connections from the Battery to the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 30 for an open
circuit or a short circuit.
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Check the wiring connections for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If the specified value was obtained:
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Switch the ignition on.
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Using a Multimeter, check the Motronic Engine Control Module (ECM) Power Supply Relay J271 socket 87 to Ground (GND).
Specified value: battery voltage.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
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Install the test box.