Component Tests and General Diagnostics

Anti-theft Immobilizer, Troubleshooting

Requirements
- Voltage supply OK.
- Diagnostic wire between instrument cluster and VAG-1551 OK.
- Valid wiring diagram and Repair Manual available.

Malfunction
- Engine does not start (when starting, engine runs and stalls after approx. 1 second)

- Connect VAG 1551 and initiate On Board Diagnostic (OBD).
- Select engine control module with address word 01.
- Check DTC memory (function 02).

Possible cause
- DTC 17978 -"Engine control module blocked" is stored in DTC memory

The immobilizer control module electronics have not released the engine control module!

- Erase DTC memory (function 05) and end output (function 06).
- Select instrument cluster OBD with address word 17.
- Check DTC memory (function 02), evaluate and correct malfunctions using DTC table. With Manufacturer Scan Tool


NOTE: After completing the repairs and adapting the immobilizer components it is absolutely necessary that the engine control module DTC memory is checked and erased.


- DTC 17978 "Engine control module blocked" is not stored in DTC memory, this means:

There is no malfunction of the electronic immobilizer!

- Perform troubleshooting according to instructions.

Malfunction
- Key adaptation faulty
- DTC 01179 "Key programming faulty" is stored in DTC memory of immobilizer control module

- Select instrument cluster OBD with address word 17.
- Press -> button.

Indicated on display (example)


IMMO-IDENT No.: VWZ7ZOV0066808 ->


- Compare 14-digit identification number shown in display with identification number on key fob.
- If identification numbers are different, determine secret number corresponding to immobilizer identification number in display. The correct secret number must be requested from the corporate radio/immobilizer code retrieval system by supplying the 14-character immobilizer identification number.
- Adapt all keys with correct secret number.

Malfunction
- "Fail" appears in odometer display in instrument cluster and engine does not start
- An incorrect secret number has been entered 3 times

Corrective measure
- Perform "Login procedure" function 11.