Immobilizer, Procedure For Malfunctions
Immobilizer, procedure for malfunctions
Requirements
- Voltage supply OK.
- Diagnostic cable between instrument cluster and VAG 1551 OK.
- Valid wiring diagram and repair manual available.
Malfunction
- Engine does not start
When started, engine starts and then switches off after approx. 1 second.
- Connect VAG 1551 Scan Tool (ST) and initiate On Board Diagnostic (OBD).
- Select Engine Control Module (ECM) using address word 01.
- Check DTC memory (function 02).
Possible cause:
- DTC 17978 "Engine Control Module (ECM) locked" is stored in DTC memory, i.e.:
NOTE:
The immobilizer circuitry did not re-activate the Engine Control Module (ECM)!
- Erase DTC memory (function 05) and end output.
- Select On Board Diagnostic (OBD) for the instrument cluster using address word 17.
- Check DTC memory (function 02) and evaluate using DTC table, repair malfunctions if necessary. Displaying and Reading Trouble Codes
- After completing repair work and adaptation of components of immobilizer, always conclude by checking DTC memory of Engine Control Module (ECM) and erasing DTC memory if necessary.
- DTC 17978 "Engine Control Module (ECM) locked" is not stored in DTC memory, i.e.:
NOTE: There is no malfunction in the electronic immobilizer!
- Troubleshoot according to instructions in engine repair manual.
Malfunction
- Key adaptation faulty or incorrect
DTC 01179 "Key programming incorrect" is stored in DTC memory of control module for anti-theft immobilizer.
- Select On Board Diagnostic (OBD) for the instrument cluster using address word 17.
- Press -> button.
Indicated on display:
WVWZZZ70Z1H000054 VWZ1Z0X0264600 ->
- Compare 14-digit identification number indicated in display with identification number on key chain.
NOTE: If the two identification numbers do not match, use the identification number indicated in the display to acquire the relevant secret number from the responsible distributor or importer.
- Adapt all keys according to repair manual, using the correct secret number.