Hi.There.
First, I go home response of the engine just gets worse from time to time you are traveling.
However, suddenly, the engine has stopped while the vehicle is moving.
There is the initial explosion.
I became unable to start the engine at last.
It was "Electric Key not Received" trouble code that is read by the FES (MES).
It is painful and very unplug the connector of the air flow sensor, but start-up is possible.
However! There is no change to the same symptoms again.
ECU of HITACHI can not read the LiveData of start-up.
You do not know the meaning at all.
I want to help.:worship:｡・ ﾟ・｡* ｡ +ﾟ｡・｡* ﾟ + ｡・ﾟ・（ﾉД`）

Thanks.
Best Regards.

Sorry.
Diagnostic Trouble Code is
A8-Electric Key Code not Received. [Ground Short]

Regards.

There is a lot of expertise on this forum and I'm sure someone will be able to point you in the right direction to rectify your problem. I'm not one of those people, but if the fault reads "Ground Short" have you checked the earth cable from the battery to the chassis?
Good luck.

Thanks reply.
Yes.It is not necessarily connected to the ground completely, you may want to display the "Open" sometimes.
I do not know the meaning of "key code received ground" of.
I was changing the Immo Box. But it is the same.
So I did a test of one.
I tried to attach the program chip that killed immobilizer in Engine ECU.
Turn the ignition and remove the key from the cylinder Transponder Coil.
Engine is Running.
I attached to the key cylinder Coil.
Engine is Not Run.
However, I would stop driving the boundary certain period of time.
There is the initial explosion. Which means that there is no relationship immobilizer.
Behavior of the above ambiguous all, I like being in the thick fog.
When the engine stops, the tachometer needle of the instrument panel, power fall as if it were cut off though.
Perhaps, I have suspects or not a problem with the Engine ECU.
After all, I was no abnormality in the sensors and actuators of all.
You want to let me come How can I feel.

Thanks.
Kinds