tron
Active Member
It is possible to buy a widget called an ESL emulator. I am guessing that the EIS sees this as a good unit and allows the engine to start, all other things being equal if the ESL fails. (It gets an ESL good signal which allows it to proceed.) That proves the key is awake and that the EIS is good should the ESL fail. Fine. Monitoring the output and input of a good key at the point where the serial data goes into the EIS would give a picture of a good signal. Monitoring that which comes OUT of the EIS would give a signal that , were it replicated, would be able to start the engine, lift the ELS and generally make it go.
If I were writing the security, there would possibly be a code hop that would modify the EEPROM memory in the EIS. and the key. I suppose that there would have to be a standard code for the emulator to report back and I would expect something similar from the engine ECU "Hi, I'm John and my VIN isxxx".
Now the ECU doesn't go wrong in the non start problem scenario but the EIS and the key both do.
Back in 1988, there were a limited number of times that you could reliably read and write a memory chip.
So, Would a car with 150 000 miles doing n average 200 mile motorway journey every day be less likely to fail than one used for local commuting but with a similar mileage? That would confirm my theory.
If I were to read the current working memory chip, dump that data into a new one and then physically replace the chip, (or replace it with something electrically compatible that replicates the function of the memory chip,) could I future proof an EIS?
If I were writing the security, there would possibly be a code hop that would modify the EEPROM memory in the EIS. and the key. I suppose that there would have to be a standard code for the emulator to report back and I would expect something similar from the engine ECU "Hi, I'm John and my VIN isxxx".
Now the ECU doesn't go wrong in the non start problem scenario but the EIS and the key both do.
Back in 1988, there were a limited number of times that you could reliably read and write a memory chip.
So, Would a car with 150 000 miles doing n average 200 mile motorway journey every day be less likely to fail than one used for local commuting but with a similar mileage? That would confirm my theory.
If I were to read the current working memory chip, dump that data into a new one and then physically replace the chip, (or replace it with something electrically compatible that replicates the function of the memory chip,) could I future proof an EIS?
