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Post Info TOPIC: 76C55 (MH6311) information


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76C55 (MH6311) information
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I've produced an op code map in a format that makes it easier to understand how the instruction decoder works, available here:

www.rhinopower.org/76xxx/docs/76xxx_opcode_map.pdf

 

Opcodes shaded in gray are changes from the standard 6301 opcodes, there are also seven opcodes that I don't have listed that are in the 6301 and therefore probably exist and need to be tested.



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I have confirmed that CF = BRCLR INDX, I put that into the 56B code which is duplicated, and now commented, below:


; decrement counters

D6F4 CE0122    LDX #$0122              ;start address of counters
D6F7 C618       LDAB #$18                ; no. of counters
D6F9 8D6E       BSR LD769
D6FB 8A01       ORAA #$01                ; flag that this is done
;
; - code removed
;
D769 CF00FF02 BRCLR X, #$FF, LD76F ; bra if all bits are clear
D76D 6A00       DEC IND,X                   ; decrement counter
D76F 08            INX                            ; go to next counter
D770 5A            DECB                         ; decrement no of counters
D771 26F6        BNE LD769                  ; loop if not done
D773 39            LD773: RTS 

 

blocks of counters are: 

X: 122 B: 18
     13A     14
     14E     03
     151     04

X: D9        01                       ; D9 is Time From Start

 

 

So that block of code decrements a bunch of registers that are used as counters, D9 is known because that is read by the diagnostic interface. I will have a look in the E931 code to see if it is similar.

Edit: It is the same in the E931 code, it has the function name decTable.

 



-- Edited by TechSupport on Tuesday 28th of September 2021 11:01:54 PM

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
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Here is a binary and partial symbols and listing: https://janehacker.ca/wiki/images/7/78/Eb23c.zip

Not all of them are in there, still searching for the others



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Hello Jane

Can you point me to the disassembly that you found those op-codes in? it might help to see what else is going on.



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What I've come across:

MH6311

  1. 0x12 possibly ???, 3, EXTENDED
  2. 0x41
  3. 0x6B
  4. 0xCD 0xFF possibly "stx", 4, EXTENDED

MH6211

  1. 0x13 possibly "brclr2", 4, DIRECT3
  2. 0xC7 possibly "brset", 4, INDEXED
  3. 0xCD 0xA3 possibly "cpd", 2, INDEXEDY
  4. 0xCD 0xAC possibly "cpx", 2, INDEXEDY
  5. 0xCD 0xDE possibly "ldy", 3, DIRECT
  6. 0xCD 0xEF possibly "stx", 2, INDEXEDY
  7. 0xCD 0xFE possibly "ldy", 4, EXTENDED

I'd have to go back and look through my disassembly files if more context is needed.



-- Edited by Jane on Tuesday 28th of September 2021 04:35:23 PM



-- Edited by Jane on Tuesday 28th of September 2021 04:39:09 PM

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I'm going to have a look at the unknown op-codes, what instructions do we need to look into? I had a laptop failure recently and a lot of the information is somewhat dispersed around various folders, drives and machines. At the moment I am missing the op-code map that I created.

I have a CF, 00? instructions in the 56B code which may be followed by some instructions using the X index register. I have a very old note that states
                            "CF - BRCLR INDX 6 BRA IF CLEAR INDEX REGISTER X *how is this six?"

I also have a CD, FE with a note that says:

                           "CD FE             4???? UNKNOWN? *Could be LDY,Y* "

 



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
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Bob


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Jane wrote:
Bob wrote:
Have to say I’m impressed with your work , what’s the Goal of your project Have you a project car that you want to add features too?

Thank you. I have a 92 Eclipse, I'm interested in pulling a masked ROM off of an MH6111, and making a couple of small changes too. That got me started on them, but at this point I'm mostly just interested in how these microprocessors work and building up the knowledge base on them. Project goal: figure stuff out, share knowledge.


Ah cool you must be in the USA if you are lucky enough to have an Eclipse ,we never got them hereno.

Im waiting on a couple of China MH6111 chips so that I can have a go at decapping them just for a look, I think Techsupport is interested in having a look at them too.



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Bob wrote:
Have to say I’m impressed with your work , what’s the Goal of your project Have you a project car that you want to add features too?

Thank you. I have a 92 Eclipse, I'm interested in pulling a masked ROM off of an MH6111, and making a couple of small changes too. That got me started on them, but at this point I'm mostly just interested in how these microprocessors work and building up the knowledge base on them. Project goal: figure stuff out, share knowledge.



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Jane wrote:
Bob wrote:

 Yes, I wrote that disassembler. I have a branch for the MH6311 that I am currently trying to run different binaries through to find undocumented instructions. Most recently I've been looking at the 95 Eclipse EPROM ECU MD312464 ROM which is MH6311 (PLCC) based, and a handful of new instructions showed up in it right away. It would be great hardware to learn about interfacing with the EPROM, if it weren't so pricy and hard to find. I do however have a 95 Eclipse EPROM TCU MD760927 which has the MH6311F (TQFP) on hand to learn from. For what I am doing right now, ECU or TCU doesn't make much of a difference, besides the actual ROM layout. I'm just looking for instructions, and lucky having a dissasembler makes building symbol files for unknown layouts fast and easy. 


 Have to say I’m impressed with your work , what’s the Goal of your project Have you a project car that you want to add features too?



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Bob wrote:
Hi Jane,

Is that your dissembly on GitHub that Techsupport posted a link to ?


 Yes, I wrote that disassembler. I have a branch for the MH6311 that I am currently trying to run different binaries through to find undocumented instructions. Most recently I've been looking at the 95 Eclipse EPROM ECU MD312464 ROM which is MH6311 (PLCC) based, and a handful of new instructions showed up in it right away. It would be great hardware to learn about interfacing with the EPROM, if it weren't so pricy and hard to find. I do however have a 95 Eclipse EPROM TCU MD760927 which has the MH6311F (TQFP) on hand to learn from. For what I am doing right now, ECU or TCU doesn't make much of a difference, besides the actual ROM layout. I'm just looking for instructions, and lucky having a dissasembler makes building symbol files for unknown layouts fast and easy. 



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Bob wrote:
steve wrote:
Jane wrote:

I found a binary for an MH6311 (1996 Hyundai Accent ECU https://tech.mirage-performance.com/ECU/MB14B.html) just to put through the disassembler for fun.


 

FYI, Based on the size of the connector and the resistors on the side that's a TCU not an ECU.


 


 I’d say that you are correct that it’s a tcu as Techsupport has pulled an eprom from a Mitsubishi fto tcu and the board looks very similar and had the MH6311 main processor.

 



-- Edited by Bob on Monday 28th of June 2021 06:26:17 PM

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Jane wrote:

I found a binary for an MH6311 (1996 Hyundai Accent ECU https://tech.mirage-performance.com/ECU/MB14B.html) just to put through the disassembler for fun. For one thing, the binary is 64k so it takes up the whole address space, with padding at the beginning like MH6111 images (~20480bytes of 0xFF). However unlike MH6111 ROM images which start at 0xD000 it starts at 0x0000. Second thing, it has a big vector table, 42 long. I'm used to MH6111 vector tables that are only 16 long. Otherwise, everything seems to decode no problem, doesn't seem to have any extra op codes (in this image at least.)


 Hi Jane,

Is that your dissembly on GitHub that Techsupport posted a link to ?



-- Edited by Bob on Monday 28th of June 2021 06:24:56 PM

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steve wrote:
Jane wrote:

I found a binary for an MH6311 (1996 Hyundai Accent ECU https://tech.mirage-performance.com/ECU/MB14B.html) just to put through the disassembler for fun.


 

FYI, Based on the size of the connector and the resistors on the side that's a TCU not an ECU.


 I thought that might be the case, thanks for pointing it out. I guess I'm ahead on my TCU research then.



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Jane wrote:

I found a binary for an MH6311 (1996 Hyundai Accent ECU https://tech.mirage-performance.com/ECU/MB14B.html) just to put through the disassembler for fun.


 

FYI, Based on the size of the connector and the resistors on the side that's a TCU not an ECU.



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I found a binary for an MH6311 (1996 Hyundai Accent ECU https://tech.mirage-performance.com/ECU/MB14B.html) just to put through the disassembler for fun. For one thing, the binary is 64k so it takes up the whole address space, with padding at the beginning like MH6111 images (~20480bytes of 0xFF). However unlike MH6111 ROM images which start at 0xD000 it starts at 0x0000. Second thing, it has a big vector table, 42 long. I'm used to MH6111 vector tables that are only 16 long. Otherwise, everything seems to decode no problem, doesn't seem to have any extra op codes (in this image at least.)



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Wow that is an in dept understanding of how the binary is functioning, the dissembler should come in handy if the eeprom can be pulled from the evo chip.

The way the table’s are set out and there functions are remarkably similar to the newer ecus, Mitsubishi did not stray to far from the mould.  



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We aren't the only ones playing with these old chips, I was contacted by someone else who has written a disassembler:

janehacker1.gitbook.io/dsm-ecu/disassembly-from-scratch/things-you-need


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TechSupport wrote:

EF89 is the firmware version, that will be burnt in as Masked ROM, possibly a bootloader. Did this chip also have a different firmware version on it? I assume that this is a 76e56?


Yes it’s the 76e56.

Where is the firmware version printed?

That die is from an evo 4 or early evo 5 ecu.

The EF89 is interesting can it be used to calculate anything or is it only for reference?



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EF89 is the firmware version, that will be burnt in as Masked ROM, possibly a bootloader. Did this chip also have a different firmware version on it? I assume that this is a 76e56?



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

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TechSupport wrote:

That is cool, I'll have a proper look at that when I get the chance. It confirms what I've said for a long time and that is that these are Toshiba chips, the 1993 date is interesting, it means that they had EEPROM devices for quite a long time.


 Yeah it’s cool to get it confirmed, I might be able to get some high res pics if needed.

What do you think the “EF89” represents?



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That is cool, I'll have a proper look at that when I get the chance. It confirms what I've said for a long time and that is that these are Toshiba chips, the 1993 date is interesting, it means that they had EEPROM devices for quite a long time.

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

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Pictures are not great because I can’t download any thing from the work computers so I took a picture of the screen , but I believe its Confirmed to be ” EF89    M   1993  Toshiba .

Edit the ”M”. Could be a “H”



-- Edited by Bob on Thursday 20th of May 2021 07:45:38 PM

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76e56f

small pictures of the die and the ecu part number , I should have access to a good microscope over the weekend To get a close up.



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TechSupport wrote:

I haven't tried it again. I have cleared all my outstanding projects but I'm working away at present, I should be back in a week or two but I don't have a project timescale for the rest of that work. I am minded to have another look at this when I get back.


 Oh projects tell me about itno, im up to my eye ball’s in trying to figure out tunerpro xdfs and checksums ,coming from learning on flashable ecus has spoiled me.....

There is absolutely no panic on this the only reason I ask is that I never new it was possible to read information off the internal bus of a chip like you have done especially a chip that no one has ever been able to crack.

Cheers BOB.



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I haven't tried it again. I have cleared all my outstanding projects but I'm working away at present, I should be back in a week or two but I don't have a project timescale for the rest of that work. I am minded to have another look at this when I get back.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

Bob


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Hi James,I hope you are well.

I was going through my collection of ecus the other day and came across the evo 4 ecu and wondered if you got around to trying your second booster adapter on this ecu as you had got so far with all the ports.



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Bob wrote:

Hi James 

just wondering if you ever got around to having a last try at this?

 

Thanks

BOB


 Not yet but I will at some point.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

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Hi James 

just wondering if you ever got around to having a last try at this?

 

Thanks

BOB



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Bob wrote:
TechSupport wrote:
TechSupport wrote:

I couldn't find any reason why my code would not execute so I swapped the emulator for an EPROM, I can now see my code on the bus so I guess the emulator didn't have sufficient drive strength. The new problem is that the code is simply being stepped through without being executed, as if the bus isn't connected. I am in an area of memory that was reading blank, more investigation to do.

Edit: Emulator works if I use a booster socket, must have had that over 10 years - first time I've needed it! Code still doesn't execute.


 I'm working on another board at present and I ran into the same issue - it seems that the adapter that I was using for the logic analyser was adding too much capacitance to the bus. Once I've finished this job I will try mode 0 again.


That’s both good and bad news.

How do you go about solving that one? 


The adapter that's giving the issues is the one pictured above, I have another adapter which just has pins that you have to plug on individual wires from the logic analyser, that one is well proven but fiddly to set up. I shall get some proper adapter boards made, I did a design some time back.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

Bob


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TechSupport wrote:
TechSupport wrote:

I couldn't find any reason why my code would not execute so I swapped the emulator for an EPROM, I can now see my code on the bus so I guess the emulator didn't have sufficient drive strength. The new problem is that the code is simply being stepped through without being executed, as if the bus isn't connected. I am in an area of memory that was reading blank, more investigation to do.

Edit: Emulator works if I use a booster socket, must have had that over 10 years - first time I've needed it! Code still doesn't execute.


 I'm working on another board at present and I ran into the same issue - it seems that the adapter that I was using for the logic analyser was adding too much capacitance to the bus. Once I've finished this job I will try mode 0 again.


That’s both good and bad news.

How do you go about solving that one? 



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TechSupport wrote:

I couldn't find any reason why my code would not execute so I swapped the emulator for an EPROM, I can now see my code on the bus so I guess the emulator didn't have sufficient drive strength. The new problem is that the code is simply being stepped through without being executed, as if the bus isn't connected. I am in an area of memory that was reading blank, more investigation to do.

Edit: Emulator works if I use a booster socket, must have had that over 10 years - first time I've needed it! Code still doesn't execute.


 I'm working on another board at present and I ran into the same issue - it seems that the adapter that I was using for the logic analyser was adding too much capacitance to the bus. Once I've finished this job I will try mode 0 again.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
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and many more.



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I don't know anything about the JECs parts, I've never dealt with one. That other chip looks like it says NFC, that may have been a fab house, the D number could be a Denso part number.

I couldn't find any reason why my code would not execute so I swapped the emulator for an EPROM, I can now see my code on the bus so I guess the emulator didn't have sufficient drive strength. The new problem is that the code is simply being stepped through without being executed, as if the bus isn't connected. I am in an area of memory that was reading blank, more investigation to do.
I can see the internal memory contents on the bus when I execute a reset from my external memory so if all else fails that is a vulnerability that I can exploit that to read out the internal memory.

 

Edit: Emulator works if I use a booster socket, must have had that over 10 years - first time I've needed it! Code still doesn't execute.



-- Edited by TechSupport on Wednesday 3rd of June 2020 06:36:25 PM

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
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Main ic: A12-212-602  labeled as jecs but I believe it to be Mitsubishi or nec.

second io chip (smaller chip) : A12-281001 labeled as jecs but a quick google brought up someone who had de-capped one and found it labeled nec D29501



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Bob wrote:

 

Off topic a bit,
I have been having a play with a micra k11 board and have come to the conclusion that the chip may be OTP as well, however there is external headers which i believe nistune do a board for.
How does the odd and even boards work? Is there 2 separate busses, one for odd and the other for even addressing ?
 

I'm not familiar with the Nistune boards, from what I understood they just place the processor into an external memory mode. In some applications people have used two chips to get enough memory, they are usually split high memory and low memory by usng the MSBs as the chip selects but it could be done as odd/even by using the LSB as the chip selects. What processor is it? 



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

Bob


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If it we’re easy every man and his dog would be doing it 😂.
Great news that you’re still at it.
Off topic a bit,
I have been having a play with a micra k11 board and have come to the conclusion that the chip may be OTP as well, however there is external headers which i believe nistune do a board for.
How does the odd and even boards work? Is there 2 separate busses, one for odd and the other for even addressing ?

TechSupport wrote:

I suspect that the problem with Mode 0 is that it runs in extended multiplexed configuration and this board is configured for non-multiplexed extended operation. So I think that I've proved that Mode 0 works but I need a board like my old ROMReader board that I used on the smaller devices.

 

Edit: I'm beginning to think that Mode 0 is partially disabled - the reset vector is picked up correctly from the external memory but the code doesn't run, it looks like internal code is present on the bus and appears to run correctly. I will investigate some more tomorrow.



-- Edited by TechSupport on Tuesday 2nd of June 2020 08:04:25 PM



 



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I suspect that the problem with Mode 0 is that it runs in extended multiplexed configuration and this board is configured for non-multiplexed extended operation. So I think that I've proved that Mode 0 works but I need a board like my old ROMReader board that I used on the smaller devices.

 

Edit: I'm beginning to think that Mode 0 is partially disabled - the reset vector is picked up correctly from the external memory but the code doesn't run, it looks like internal code is present on the bus and appears to run correctly. I will investigate some more tomorrow.



-- Edited by TechSupport on Tuesday 2nd of June 2020 08:04:25 PM

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
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I gave Mode 0 a try a few weeks and had no success, I'm looking at it again now and I made a mistake with the configuration. I do now seem to have it running in Mode 0 but its not running correctly.
If there is already code in the area that I'm trying to run code in then it will all be corrupted.



-- Edited by TechSupport on Tuesday 2nd of June 2020 05:33:22 PM

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
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Bob


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TechSupport wrote:
Bob wrote:

 


 Does that mean that pin 79 is not capable of being used to put the chip into boot mode.?

Is there anything I can be testing?


 

That depends on how boot mode works, it could be a simple signal that when present causes the code to jump to a bootloader routine. This weekend I'm going to try and put the MH6311 into mode 0 and see if that works, that will be the real test to see if this is a feasible project.


Looking forward to the result regardless of the outcome as it will either put this ecu to bed or open up another one to play with. 



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Bob wrote:

 


 Does that mean that pin 79 is not capable of being used to put the chip into boot mode.?

Is there anything I can be testing?


 

That depends on how boot mode works, it could be a simple signal that when present causes the code to jump to a bootloader routine. This weekend I'm going to try and put the MH6311 into mode 0 and see if that works, that will be the real test to see if this is a feasible project.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

Bob


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TechSupport wrote:

Pin 79 is just a 12V digital input.
Pin 62 is bi-directional comms, which you would expect for K-Line, and goes to pin68 and 67 on the processor which is known to be the serial port on the MH6311, so that's good.
Pin 56 I have as a RX line which is also connected to pin 67 on the processor.

The two 165s are cascaded and work as a serial in (from the processor), parallel out shift register to drive a bunch of digital outputs.


 Does that mean that pin 79 is not capable of being used to put the chip into boot mode.?

Is there anything I can be testing?



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Pin 79 is just a 12V digital input.
Pin 62 is bi-directional comms, which you would expect for K-Line, and goes to pin68 and 67 on the processor which is known to be the serial port on the MH6311, so that's good.
Pin 56 I have as a RX line which is also connected to pin 67 on the processor.

The two 165s are cascaded and work as a serial in (from the processor), parallel out shift register to drive a bunch of digital outputs.

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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

Bob


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TechSupport wrote:
Bob wrote:

 


 i thought the cam and crank go through the e310a chip to be conditioned first? Or am I think of the h8 ecus?

Did you see them two 74hc165a they are used in Mitsubishis k line communication on 56 and 62 they might be of interest.

i can send commands through the k line to switch on and off various things like injectors /fuel pumps/egr and purge etc, the program is call evoscan 


The E310A is a level translator, it converts the signals from 12V to 5V and from 5V to 12V. One of the inputs has two outputs, one of which is inverted, and that input is usually used for cam or crank. I have the pinout mostly defined, I will try and find that, for the 12V inputs you can just put a low frequency square wave on the ECU input and check the pins to see where the 5V output is, fro memory the threshold voltage is around 7V. The other way you need to force the processor into reset and then inject a 5V signal through a resistor and then look for the 12V output.

I had a look at 62, which I think is the K-line, I have 51 as the immobiliser pin, 56 is shown as unused? I would think they are using the shift registers to implement the serial port, there is most likely only one in the processor. Its an old trick that seems to have made a bit of a come back on some modern processors.

Is the Mitsubishi protocol described anywhere? if you know that then that makes reverse engineering the software much easier.


A lot of good info here as I’m currently working on the cam and crank on the h8 and am confused at finding the crank signal invert on 2 pins.

 



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Something else to play with.

 

I've added the E310A pinout to this thread:

https://rhinopower.activeboard.com/t43171026/analysing-and-testing-the-8v-tracker-sidekick-and-vitara-ecu/

I have a scrap board that I will hack about to see if I can pair up the remaining five sets of pins.



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1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

Bob


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As you follow pin 79 take a look at my board for reference and you can see all the components are fitted.



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It’s definitely pins 56 which goes to obd2 pin 1

k line is pin 62 and goes to obd2 pin 7.

ill attach a picture below.

you will see pin 79 mentioned in the ecu pin out and that is used for putting the ecu into programming mode in evo 5/6/7 .

if you follow pin 79 circuit you will see it is missing all the components going back to both the mh63 and the e310a on the evo 4 ecu however if you take a close look at my Ralliart tuned ecu you will see all of the components are fitted to my board.



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Mut commands.

https://evoecu.logic.net/index.php?title=MUT_Commands&diff=839&oldid=838



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Mut protocol 

https://evoecu.logic.net/wiki/MUT_Protocol



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Bob wrote:

 


 i thought the cam and crank go through the e310a chip to be conditioned first? Or am I think of the h8 ecus?

Did you see them two 74hc165a they are used in Mitsubishis k line communication on 56 and 62 they might be of interest.

i can send commands through the k line to switch on and off various things like injectors /fuel pumps/egr and purge etc, the program is call evoscan 


The E310A is a level translator, it converts the signals from 12V to 5V and from 5V to 12V. One of the inputs has two outputs, one of which is inverted, and that input is usually used for cam or crank. I have the pinout mostly defined, I will try and find that, for the 12V inputs you can just put a low frequency square wave on the ECU input and check the pins to see where the 5V output is, fro memory the threshold voltage is around 7V. The other way you need to force the processor into reset and then inject a 5V signal through a resistor and then look for the 12V output.

I had a look at 62, which I think is the K-line, I have 51 as the immobiliser pin, 56 is shown as unused? I would think they are using the shift registers to implement the serial port, there is most likely only one in the processor. Its an old trick that seems to have made a bit of a come back on some modern processors.

Is the Mitsubishi protocol described anywhere? if you know that then that makes reverse engineering the software much easier.



__________________

1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

Bob


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Posts: 53
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TechSupport wrote:

I haven't had a lot of time to work on this over the last week. I did take a look at the EVO4 ECU (MH6371), the power pins map to the MH6311, the analogue pins look to be in the right place, the E clock is present and there is activity on the R/W pin so that all looks good. I traced out the circuitry for the crank and cam inputs and the ignition and injector drivers. I'm hoping they will map to the timer pins on the MH6311 but I haven't succeeded in getting the output compare channels to work yet, there must be enable bits somewhere but its not obvious from the code; I've been through setting registers to FFh, which normally works, but so far no success.


 i thought the cam and crank go through the e310a chip to be conditioned first? Or am I think of the h8 ecus?

Did you see them two 74hc165a they are used in Mitsubishis k line communication on 56 and 62 they might be of interest.

i can send commands through the k line to switch on and off various things like injectors /fuel pumps/egr and purge etc, the program is call evoscan 



__________________


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Status: Offline
Posts: 1308
Date:
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I haven't had a lot of time to work on this over the last week. I did take a look at the EVO4 ECU (MH6371), the power pins map to the MH6311, the analogue pins look to be in the right place, the E clock is present and there is activity on the R/W pin so that all looks good. I traced out the circuitry for the crank and cam inputs and the ignition and injector drivers. I'm hoping they will map to the timer pins on the MH6311 but I haven't succeeded in getting the output compare channels to work yet, there must be enable bits somewhere but its not obvious from the code; I've been through setting registers to FFh, which normally works, but so far no success.



__________________

1984 Suzuki SJ413K pick up, 1.6 16V Baleno engine
2000 Suzuki Vitara 1.6 8V, many mods
2004 Suzuki Ignis 1.5VVT 4Grip
2006 Suzuki Jimny 1.3VVT JLX+
and many more.

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