Volkswagen Workshop Manuals
Passat Sedan V6-3.6L (BLV) (2008)
Powertrain Management > Computers and Control Systems > Information Bus > Component Information > Testing and Inspection > Initial Inspection and Diagnostic Overview > Page 3081
After repair work, the following work steps must be performed in the mentioned sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] See: Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] See: Testing and Inspection/Scan Tool Testing
and Procedures/Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] See: Testing and Inspection/Monitors, Trips, Drive
Cycles and Readiness Codes.
CAN-Bus Terminal Resistance, Direct Shift Gearbox Mechatronic to Direct Shift Gearbox
CAN-Bus Terminal Resistance, Direct Shift Gearbox Mechatronic to Direct Shift Gearbox Mechatronic, Checking
Special tools, testers and auxiliary items required
‹› Wiring diagram.
‹› A CAN Bus malfunction was recognized.
‹› The Motronic Engine Control Module (ECM) (J623) and Direct Shift Gearbox (DSG) Mechatronic (J743) 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.
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
Trouble-free operation of the CAN Bus requires that it have a terminal resistance. This central terminal resistance is located in the Motronic Engine
Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] See: Testing and Inspection/Scan Tool Testing
Disconnect the Direct Shift Gearbox (DSG) Mechatronic (J743) electrical harness connector.
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