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Post Info TOPIC: Hack denso ECU on old mazda 626


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Hack denso ECU on old mazda 626

Hi All,
This looks like a great forum, hopefully someone can help me to hack my ecu as i have hit a bit of a road block.

My car is a mazda 626 91 year, it has a denso ECU which has the number F2H2 among others on it. I am trying to modify the tuning however i opened up the ECU and there is no apparent eeprom and the part numbers of the controller look like they are renumbered so i cant look up the datasheet.
I have attached a picture of the opened ECU and it is only single sided.

there are 2 ICs on the board of interest, the TC5564 which from datasheets appears to be statis ram so it cant hold the non volatile values that an eeprom normally would.
The other IC is the D 151802-7220, this looks like the controlling chip however it looks like its been renumbered so the IC number on top doesn't give me any leads on a datasheet.
i saw in another thread someone else knew what a very similar part to the D151802 was.

Can anyone help me identify what the actual part number for this IC is  D151802-7220
Does anyone know how to connect reprogram such an old style ECU


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The D151802 appears to be a Denso software specification number, it doesn't, unfortunately, tell you which processor you have. As far as I have been able to assertain the processors were manufactured by Toshiba. I have only looked at a couple of early models with a 42-pin processor but with those I wasn't able to change the processor mode to be able to extract the contents of ROM.
Can you email me a better picture of the processor? it looks a bit different. Also it looks like you have a space for an external EPROM.



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Holy old thread dig up Batman! I know may be an old thread and that you probably don't have the car anymore, but I thought I'd offer some info.

The D151802 64 dip chip that as Rhinoman has rightly mention is a Toshiba chip of 8X origin. The cpu is a D151802 with the code being image 7720. It has the same architecture as the D151801 commonly found in many Toyota's of the same era. To chip this ecu you will need to bridge the jumper link J01, J111 and J112. This will force the D151802 cpu to access external ROM. You will need to get hold of the eprom from an 88-89 F220 ecu, which are common across most regions with the 2.2ltr 12valve. You may even be able to find a bin file online for it.

From here it is just a matter of imaging the bin and using something like winOLS to locate ignition and fuel maps.

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