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Hacking up Honda's ECU
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 Post subject: Swapping IC1
PostPosted: Sat Feb 11, 2023 4:33 pm 
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Can IC1 be swapped with other processors? For example replace a 301 processor (P06) with 274 processor (P75)?


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 Post subject: Re: Swapping IC1
PostPosted: Sun Feb 12, 2023 1:44 pm 
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Processor named M66207, digits after is built-in software version.

So you can swap IC1 to any M66207, but need to install extended ROM chip with software fits to PCB with proper options (VTEC, atmo pressure sensor, injector test circuit...)


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 Post subject: Re: Swapping IC1
PostPosted: Sun Feb 12, 2023 5:15 pm 
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Thanks for the reply!

So the extended ROM chip is IC2 right?


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 Post subject: Re: Swapping IC1
PostPosted: Mon Feb 13, 2023 5:29 am 
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If you talking about P06 ECU - extended ROM is IC3. You have to make "chiptuning" as it described anywhere so CPU can use proper software stored in IC3.


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 Post subject: Re: Swapping IC1
PostPosted: Mon Feb 13, 2023 9:12 am 
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Thanks for that as I thought IC2 was the backup ROM for LIMP mode and contained the information relative to the engine the ECU was made to operate. Is IC2 the backup processor and IC3 the code for IC1?

Also...

>>> You have to make "chiptuning" as it described anywhere

I don't quite understand what you mean here.


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 Post subject: Re: Swapping IC1
PostPosted: Tue Feb 14, 2023 8:21 am 
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Sorry, typing "chiptuning" I ment "chipping" OBD1 ECU - you can read about it at https://mycomputerninja.com/~jon/www.pg ... bHome.html - "Beginners Section" - "Introduction To ECUChipping"

Any CPU M66207 installed in ECU has factory built-in software marked with "-XXX" code on top. If you replacing CPU (and you cannot change factory software) you must make "chipping" ECU to make CPU use software stored in IC3.

And this new software stored in IC3 must correspond your engine and ECU hardware (VTEC switches, atmo pressure sensor, injector test circuit...).


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 Post subject: Re: Swapping IC1
PostPosted: Mon Mar 27, 2023 8:23 pm 
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7rrivera7 wrote:
Thanks for that as I thought IC2 was the backup ROM for LIMP mode and contained the information relative to the engine the ECU was made to operate. Is IC2 the backup processor and IC3 the code for IC1?

Also...

>>> You have to make "chiptuning" as it described anywhere

I don't quite understand what you mean here.


Yes for large case ecu, IC2 is for Check light. IC3 is for external rom for IC1


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 Post subject: Re: Swapping IC1
PostPosted: Mon May 22, 2023 2:32 pm 
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So did anyone sucesfully swap the IC1? I think my IC1 is bad and want to replace it, I have a P30-G01 and it has a M66207-318 inside. Can't find an exact same one so I was gona put in an M66207-301. Just wondering if that will work? The chip is NEW so will that work or do I need to program it and if I need to program it is that even possible?


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 Post subject: Re: Swapping IC1
PostPosted: Tue May 23, 2023 11:15 pm 
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blaz265 wrote:
So did anyone sucesfully swap the IC1? I think my IC1 is bad and want to replace it, I have a P30-G01 and it has a M66207-318 inside. Can't find an exact same one so I was gona put in an M66207-301. Just wondering if that will work? The chip is NEW so will that work or do I need to program it and if I need to program it is that even possible?


Can use difference processor number as long it come from same board design. 11F0, 1720 or 1980. cannot use processor from 11f0 into 1720 board


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 Post subject: Re: Swapping IC1
PostPosted: Wed May 24, 2023 9:39 am 
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majdi wrote:
Can use difference processor number as long it come from same board design. 11F0, 1720 or 1980. cannot use processor from 11f0 into 1720 board


It has a 02D011F0-1500 board and a M66207-318, looked at some pictures of other ECUs with the same board and some of them have the M66207-301. So I can just put a NEW one in and everything will work if I use an eeprom? The chip is NEW and i'm worried that I would have to program it or something, has it been programmed already in the factory or does it just not need to be programed if I use an eeprom?

This is the chip I want to order: https://www.jotrin.com/product/parts/M66207_301

Also if anyone is wondering why I want to replace it, it's because it looks like the RxD pin on the chip has been burned, can't connect to the ECU via the datalogging port (CN2) and the CEL is always on.
Made a post on that subject here: http://forum.pgmfi.org/viewtopic.php?f=8&t=25034

UPDATE: Swapped the IC1 and now it's working.


Last edited by blaz265 on Tue Jul 11, 2023 7:30 am, edited 1 time in total.

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 Post subject: Re: Swapping IC1
PostPosted: Mon Jun 19, 2023 9:20 pm 
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blaz265 wrote:
So did anyone sucesfully swap the IC1? I think my IC1 is bad and want to replace it, I have a P30-G01 and it has a M66207-318 inside. Can't find an exact same one so I was gona put in an M66207-301. Just wondering if that will work? The chip is NEW so will that work or do I need to program it and if I need to program it is that even possible?



it can work as long the board have same design.. i have swap so many. only get problem when i used any from p28 swap to p27


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 Post subject: Re: Swapping IC1
PostPosted: Fri Sep 01, 2023 5:23 am 
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blaz265 wrote:
So did anyone sucesfully swap the IC1? I think my IC1 is bad and want to replace it, I have a P30-G01 and it has a M66207-318 inside. Can't find an exact same one so I was gona put in an M66207-301. Just wondering if that will work? The chip is NEW so will that work or do I need to program it and if I need to program it is that even possible?


I have the same problem. It's a P29 (1720 borad) with a bad M66207-224. I can't access any new M66207s or even any ECU with this MCU. But I have many M66911 MCUs that are pulled out from Accord ECUs like PT3, PT5, PT6, P3D (which uses the same board as P0A) and P14. All these ECUs have external ROM and I guess that M66911 always looks for an external ROM and has no internal ROM memory. Accord ROMs are more complicated and have more tables. So I guess that M66911 has more RAM memory rather than M66207. Assuming that pinouts are similar in M66207 and M66911, a M66207 can be replaced with a M66911 on a chipped ECU. I searched many hours to find M66911 datasheet but could'nt find it.

Another interesting fact that I realized is that some (or maybe all) Accord TCUs have M66201 which is similar to M66207 but with less internal ROM and RAM. Less RAM means M66207 can't be replaced with a M66201.
Internal ROM : MSM66201 16K bytes, MSM66207 32K bytes
Internal RAM : MSM66201 512 bytes, MSM66207 1024 bytes

Also i checked knock board MCUs and realized that they have different pinouts.

Now I need M66911 datasheet or anyone to confirm that M66911 has the same pinout as M66207 or not. Who can help me in this?


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