Jetta Sedan L5-2.5L (CBTA) (2009)
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Replace the Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
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.
If the manufacturers test box is not being used, perform the following step.
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Remove the Engine Control Module (ECM) (J623). Refer to --> [ Motronic Engine Control Module, Replacing ] .
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Using a multimeter, check the Data Bus On Board Diagnostic Interface (J533) electrical harness connector to the Engine Control Module (ECM)
(J623) electrical harness connector T121 for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
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Check the wiring connection for an open circuit.
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Check the wiring connection for damage, corrosion, loose or broken terminals.
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If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring:
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Replace the Data Bus On Board Diagnostic Interface (J533).
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to --> [ Diagnostic Mode 03 - Read DTC Memory ] See: Testing and Inspection/Scan Tool Testing and
Procedures/Diagnostic Mode 03 - Read DTC Memory.
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 Mode 04 - Erase DTC Memory.
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 Motronic Engine Control
Module, Checking
CAN-Bus Terminal Resistance, Direct Shift Gearbox Mechatronic to Motronic Engine Control Module, Checking
Special tools, testers and auxiliary items required
‹› multimeter.
‹› Wiring diagram.
Test requirement
‹› A CAN-Bus malfunction was recognized.