Passat Sedan V6-3.6L (BLV) (2008)
Information Bus: Component Tests and General Diagnostics
CAN Bus Terminal Resistance, Checking
Diagnostic Procedures
CAN Bus Terminal Resistance, Checking
Special tools, testers and auxiliary items required
‹› multimeter
‹› Wiring diagram.
Test requirements
‹› A CAN Bus malfunction was recognized.
‹› The Motronic Engine Control Module (ECM) (J623) fuses OK.
‹› Battery voltage at least 12.5 volts.
‹› All electrical consumers such as, lights and rear window defroster, switched off.
‹› Vehicles with automatic transmission, shift selector lever into position " P" or "N".
‹› A/C switched off.
‹› Ground connections between engine/transmission/chassis OK.
‹› Ignition switched off.
Test procedure
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Observe safety precautions. Refer to => [ Safety Precautions ] See: Service Precautions/Safety Precautions
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Observe Clean Working Conditions. Refer to => [ Clean Working Conditions ] See: Service Precautions/Clean Working Conditions
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Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Preliminary Check.
Function
The Motronic Engine Control Module (ECM) (J623) communicates with other CAN Bus capable control modules.
The control modules are connected by two data bus wires which are twisted together (CAN High and CAN Low), and exchange information