Limp Home Function

Limp Home by Tester. If the PCM (ECM) detects a SMARTRA or transponder malfunction, the PCM (ECM) will allow the immobilizer to operate in emergency mode. Limp Home is possible only if the user password (4 digits) has been previously provided to the PCM (ECM). This password can be selected by the vehicle owner and is programmed at a service station. The user password can be sent to the PCM (ECM) through the special tester menu. Only if the PCM (ECM) is in the "learned" state, the user password status is "learned", and the user password is correct, will the PCM (ECM) be unlocked for a period of time (30 sec.). The engine can be started only during this time. After the time has expired, engine start is not possible. If an incorrect user password is sent, the PCM (ECM) will reject the Limp Home request for one hour. Disconnecting the battery or any other action cannot shorten this time. After the battery is reconnected to the PCM (ECM), the timer starts again for one hour.

Limp Home by Ignition Key. Limp Home can also be activated with the ignition key. The user password can be entered into the PCM (ECM) by a special ignition ON-OFF sequence. Only if the PCM (ECM) is in the "learned" state, the user password status is "learned", and the user password is correct, will the PCM (ECM) be unlocked for a period of time (30 sec.). During this time, the engine can be started. After the time has expired, engine start is not possible. After a new password has been entered, the timer (30 sec.) starts again. After the ignition is turned off, the PCM (ECM) is locked if the timer has expired. 8 seconds. For the next start, the user password must be entered again.