The ECM and the SMARTRA communicate by dedicated line. During this communication of ECM and SMARTRA the K line of ECM cannot be used for communication. The ECM controls the communication either to SMARTRA or to other devices(e.g. scanner) on K line by switching of a multiplexer and specific communication procedures. The multiplexer is a part of ECM H/W.
This DTC is defined as that ECM, indicator or scantool have some problem.
Item
Detecting Condition
Possible cause
Enable Condition
? IG ON
? Scantool Error
? Faulty Transponder
? Faulty Smartra
? Faulty ECM
Immobilizer indicator or ECM Faults
? Not plausible VSS data stored at ECM.
? Virgin key at Learnt ECM.
? No valid data from SMARTRA after 3 attempts by ECM
? Invalid tester message or unexpected requests by tester(e.g. exceeding the maximum limit of twice IGN ON or teaching trials)
ECM :
Virgin(This is status at the end of ECM production line before delivery to customer)
Neutral (This is a status that is erased all data regarding immobilizer by special command from scanner)
Not Check (The status is stored in permanent memory (EEPROM or Flash etc.).
In case of not plausible data from this circuit the ECM cannot check the status.
Locked by timer (After a certain number of incorrect user Password(4) or PIN Code(6) the EMS is locked for one hour and no inputs are accepted during this time)
KEY :
Virgin (It means the key in the key cylinder has not matched with ECM yet)
Invalid (mismatched)
- Key with NO Transponder
- More than 1(One) Transponder in the magnetic field
- No Transponder in the magnetic field.
- TP data blocked
- TP data does not exist
- TP data changed
- TP Teaching error
- Multiple TP data input
Current Data from Immobilizer will show the numbers of Key learnt, ECM status, and Key status as Fig 1. Thanks to this current data, the symptom of unable starting is probably assumed what problem it is.
Fig. 2 shows possibility of Engine start, Teaching or changing of user password according to ECM status.