Immobilizer System: General Description: Notes
The immobilizer system consists of the four major components which are Powertrain Control Module (PCM), Immobilizer Control Unit (ICU), transponder, and scan tool (Tech-2).
This system can be activated by a correctly programmed transponder and starter switch is set to OFF.
This system can be deactivated by a correctly programmed transponder key connected with a correctly programmed PCM and a correctly programmed ICU.
While the system is on:
The starter cut off relay deactivates function of starter, and the fuel injector power source is deactivated also.
What happens without proper transponder operation?
One of the function of transponder is to deactivate or activate starter function. If the proper transponder is not used, starter cannot be operated. Because starter relay stays off, cranking engine is not possible.
After the starter relay is activated, transponder signal triggers to let ICU calculate by transponder address signal and immobilizer algorithm.
When the result matches with necessary condition, it makes injector power source be activated.
If transponder does not send correct signal, ICU and PCM do not activate injector system on.
Therefore the vehicle cannot be operated.
No proper transponder is available, what should be done for the system?
When any proper transponder is not available, a new transponder should be programmed. Up to 5 transponders can be provided with a scan tool (Tech-2) and by proper procedure.
In addition to the absence of proper transponder, it may happen particular secret code to the particular vehicle is missing. In this case, the secret code must be provided by your organization.
Otherwise transponder cannot be programmed in any way.
If the essential for a scan tool (Tech-2) for programming and proper software for Tech-2 are not available, there is no permanent way to fix system. Temporary replace with new PCM, new ICU and new transponder without any secret code can make the system be deactivated, but it does not last long. Such a replacement does not solve any condition. Even after replacement, the system is activated automatically in short time and then no operation of the vehicle can be made in any way.
Tech-2 should be provided in your organization.