Limp Home Function
- Limp Home By Tester
If the PCM (ECM) detects the fault of the SMARTRA or transponder, the PCM (ECM) will allow limp home function of the immobilizer. Limp home is only possible if the user password (4 digits) has been given to the PCM (ECM) before. This password can be selected by the vehicle owner and is programmed at the service station.
The user password can be sent to the PCM (ECM) via the special tester menu.
Only when the PCM (ECM) is in "learnt" status, the user password status is "learnt" and the user password is correct, the PCM (ECM) will be unlocked for a period of time (30 sec.). The engine can only be started during this time. Engine cannot be started after this time has elapsed.
If the wrong user password is sent, the PCM (ECM) will reject the request of limp home for one hour. Disconnecting the battery or any other action cannot shorten this duration. After connecting the battery to the PCM (ECM), the delay timer will reset to one hour.
- Limp Home By Ignition Key
The limp home can be activated also by the ignition key. The user password can be input to the PCM (ECM) by a special sequence of ignition on/off.
Only when the PCM (ECM) is in "learnt" status, the user password status is "learnt" and the user password is correct, the PCM (ECM) will be unlocked for a period of time (30 sec.).
The engine can be started during this time. Engine cannot be started after this time has elapsed. After a new password is entered, the timer (30 sec.) will reset.
After ignition off, the PCM (ECM) is locked if the timer has elapsed 8 seconds. For the next start, the input of the user password is requested again.