Diagnostic Strategies

DIAGNOSIS OF IMMOBILIZER FAULTS

- Communication between the ECM and the SMARTRA/ICM.
- Function of the SMARTRA/ICM and the transponder.
- Data (stored in the ECM/ICM related to the immobilizer function.




THE ABOVE TABLE SHOWS THE ASSIGNMENT OF IMMOBILIZER RELATED FAULTS TO EACH TYPE :




PROBLEMS AND REPLACEMENT PARTS :

REPLACEMENT OF ECM/ICM AND SMARTRA

In case of a defective ECM/ICM, the unit has to be replaced with a "virgin" or "neutral" ECM/ICM. All keys have to be taught to the new ECM/ICM. Keys, which are not taught to the ECM/ICM, are invalid for the new ECM/ICM (Refer to key teaching procedure). The vehicle specific data have to be left unchanged due to the unique programming of transponder.

In case of a defective SMARTRA, there is no special procedure required. A new SMARTRA device simply replaces the old one. There are no transponder-related data stored in this device.

NEUTRALISING OF ECM/ICM

The ECM/ICM can be set to the "neutral" status by a tester.

A valid ignition key is inserted and after ignition on is recorded, the ECM/ICM requests the vehicle specific data from the tester. The communication messages are described at "Neutral Mode". After successfully receiving the data, the ECM/ICM is neutralized.

The ECM/ICM remains locked. Neither the limp home mode nor the "twice ignition on" function, is accepted by the ECM/ICM.

The teaching of keys follows the procedure described for the virgin ECM/ICM. The vehicle specific data have to be unchanged due to the unique programming of the transponder. If data should be changed, new keys with a virgin transponder are requested.