Checking Wiring
-- Remove the Engine Control Module (ECM) -J623-. Refer to the Repair Information.
-- 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 T94 for short to ground, high resistance or an open circuit. Refer to Wiring Diagrams for terminal locations.
For 2009-2010 Jetta, Golf, Sportwagen and 2012 Passat NMS (Consult Wiring Diagrams for specific model)
| Data Bus On Board Diagnostic Interface -J533- electrical harness connector terminals: | Engine Control Module (ECM) -J623- electrical connector T94 terminals: |
|---|---|
| 6 (Can Bus Low) | 67 |
| 16 (Can Bus High) | 68 |
For 2011> Models: Except 2012 Passat NMS (Consult Wiring Diagrams for specific model)
| Data Bus On Board Diagnostic Interface -J533- electrical harness connector terminals: | Engine Control Module (ECM) -J623- electrical connector T94 terminals: |
|---|---|
| 18 (Can Bus Low) | 67 |
| 19 (Can Bus High) | 68 |
Specified value: 1.5 Ω Max.
If the specified value was Not obtained:
-- Check the wiring connection for short to ground, high resistance or an open circuit.
-- Check the wiring connection for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is found in the wiring and the Terminal Resistance was Not OK:
-- Replace the Engine Control Module (ECM) -J623-. Refer to the Repair Information.
If no malfunction is found in the wiring and the Terminal Resistance was OK:
-- Replace the Data Bus On Board Diagnostic Interface -J533-.