Mazda 3 synchro ECU

**tom3212** · 6th February, 2018, 07:48 PM

Hello
Maybe someone knows how to fix the Mazda 3 ecu eeprom

I have loaded another eprom, managed to finish and the car has ignited but it has versions of the version

and I would have to repair the original file

**kiszka** · 6th February, 2018, 08:01 PM

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**Tismot** · 6th February, 2018, 08:25 PM

I have a similar issue with a Mazda 3, I have replaced the engine ECU with a secondhand one
I have coded it to the vehicle and it runs. But I have a DTC of P1603.
If I post both ecu and dash dumps here could someone have a look for me?

Thanks in advance
Mark

**kiszka** · 6th February, 2018, 09:10 PM

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**tom3212** · 7th February, 2018, 08:44 AM

Hello
I send you 2 sets of files

1 mazda 3 error is the original
2 mazda 3 ok - this only ignites the error of the version

See if this is up to grab?

**kiszka** · 7th February, 2018, 11:03 AM

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**tom3212** · 7th February, 2018, 03:42 PM

Thanks
only the key worked again and I added ok

**mavrVV** · 7th February, 2018, 08:56 PM

Hi.Here's another option.
Password write in PM

**Tismot** · 8th February, 2018, 11:04 AM

Thanks for your offer to help, The vehicle came to me as a non start, ECU dead (no comms) supplied a second ECU and aligned the PATS system.

Vehicle starts but has the MIL on and is in limp home mode. P1603-68 present.

I can not read the 95160 eprom in the old ECU (I think that is half the problem with the old unit), I can get a read from the replacement unit.

I have opened up the dash panel looking for the 9s12 MCU that everybody speaks of but my dash is different, could you have a look at the photos below and give me a pointer as to what chip you need a read of.

**kiszka** · 8th February, 2018, 11:10 AM

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**Tismot** · 8th February, 2018, 12:42 PM

Thanks,

I don't understand your reply.

>>> search for the eeprom, the sea next to the display
first give eeprom dump ecu, here <<<

I will grab a dump of the engine ECU and upload it here.

I have looked on Engima and it says my dash will have a 93C56 eprom which it does have, is that the correct one you need a dump of ?

Regards

Mark