Signal Waveform

Fig 1: Scan Tool Display - ECU Status Learnt

G04863817

Courtesy of KIA MOTORS AMERICA, INC.

EMS STATUS REFERENCE

EMS Status	Engine start with valid key	Engine start by limp home	Teaching of key	Teaching or changing of user password	Twice ignition of function
Not yet checked	No	No	No	No	No
Virgin	No	No	Yes	No	Yes, with virgin key
Learnt	Yes	Yes, with learnt user password	Yes	Yes	No
Neutral	No	No	Yes	No	No
Locked by timer	No	No	No	No	No

ECM:
1. Virgin (This is status at the end of ECM production line before delivery to customer)
2. Neutral (This is a status that is erased all data regarding immobilizer by special command from scanner)
3. 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.
4. Locked by timer (After a certain number of incorrect user Password (4) or PIN Code (6) the ECM is locked for one hour and no inputs are accepted during this time)
KEY:
1. Virgin (It means the key in the key cylinder has not matched with ECM yet)
2. Invalid (It means that data is mismatched between ECM and transponder)
3. Not Checked (It means that ECM cannot check the transponder data in the key cylinder)
  - ECM cannot check the transponder data because of SMARTRA error or antenna coil error.
  - ECM cannot check the transponder data because of communication circuit problem between ECM and SMARTRA.
  - 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. The current data provides an indication of the probable cause.

Fig 2. shows possibility of Engine start, Teaching or changing of user password according to ECM status.