ECM FAILURE POLL AND DISCUSSION

ECM Failure poll

  • Year 2002 thru 2007 Failure - NON Police bike

    Votes: 34 45.3%

  • Year 2002 thru 2007 Failure - POLICE BIKE

    Votes: 0 0.0%

  • Year 2008 and newer Failure - NON Police bike

    Votes: 3 4.0%

  • Year 2008 and newer Failure - POLICE BIKE

    Votes: 1 1.3%

  • Your solution: Replaced ECU

    Votes: 15 20.0%

  • Your solution: Awaiting ECU

    Votes: 2 2.7%

  • Your solution: Live with it

    Votes: 8 10.7%

  • Just looking

    Votes: 38 50.7%
  • Total voters
    75
Has anyone tried to use 2008 or later ECM> I think it should work fine but would require the connectors to be re-pinned and upgraded to 33 pin style.
 
CruSTy said:
Has anyone tried to use 2008 or later ECM> I think it should work fine but would require the connectors to be re-pinned and upgraded to 33 pin style.
Click to expand...
IF the only difference is pin-out related. As a test, can an engine from an '07 or earlier be transplanted into an '08 or later bike with no other electrical modifications; i.e., keeping the '08+ ECM?
 
devro said:
2009 St1300a.
Where is the Diagnostic Connector?
And, how does one read the FI Codes?
Click to expand...
I replied to you in the other thread- See below;

Fuel Pump Problems, need advise | ST1300 Related

2009 ST 1300a I'm asking for help to make sure I'm going in the right direction before I pull/replace the fuel pump. The fuel pump is not working. Does not momentarily run when the ignition is turned on. I read and used an extensive write-up on how to check the relays, bank angle sensor, ect...
www.st-owners.com www.st-owners.com
 
reparada
 

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Mellow said:
This will be something that is more an more common, already is, as time goes on.

I'll use this thread to:
1 - track what category of bikes seem to have the issue - seems obvious the oldest bikes will have this first but maybe not.
2 - track the symptoms (FI codes) and trouble shooting steps before taking the big step towards a new ECM
3 - Discuss possible workarounds.

Also, no one here is an expert in spite of what they may think and a forum exists to discuss subjects and collaborate on those subjects. Anyone that does not adhere to that level of collaborative respect will be banned from this thread and possibly more.

I'll try to keep this thread updated as we move forward.

Symptoms:
- FI Code 26 - Right Knock Sensor - this is the code most will get and sometimes it is the sensor.
- Other FI codes have also appeared but 26 is the is the common one
- Reduced gas mileage, more heat.

Troubleshooting/Causes:
- HERE is a link for checking and resetting the code
- FI Code 26 - Right Knock Sensor - this is the code most will get and sometimes it is the sensor.
- The Honda 070MZ-MCA0100 ECM, Test Harness currently goes for over $2000 and there's probably other proprietary software you can't get unless you're a dealer
- Some have said the ECM fails due to age, heat, moisture, vibrations, etc... basically external environmental affects.

Solutions/Workarounds:
- Repair or Refurbish options - The ECM is sealed therefore not typically something serviceable.
- Replacement ECMs are currently anywhere from $600 to $1300 new, cheaper on ebay but you don't know the history and impossible to check if it has issues. Also, pre 2008 ECMs are tough to find.
- 2008 and newer ECM Part number - 38770-MCS-R12
- 2002 thru 2007 ECM Part number - 38770-MCS-L01 - Police version (38770-MCS-A31) will have a 120mph speed limiter
- A member noticed: "The only time it flags a light is when I push it over 4000 rpm in high gear. It kicks the timing back as soon as it flags the light, and that brings more heat and poorer mileage. Anything below that rpm in high gear and its fine. I can run it up red line through the rest of the gears, no problem."
- Manufacturers typically have to keep making replacement parts for 10 years after the last model - not sure how stringent that is but could be a big issue in a few more years as parts become more rare.
- It may be impossible for a company to create a replacement ECM or some type of bypass to fool the ECM into thinking all is ok as the market is a small one and the development effort will probably never be met.
- It's also possible the code 26... might be an electrical short and an accurate code, however that short may be what takes out the ECM. The knock sensors are close to the exhaust headers and the wire insulation doesn't last long in those areas, check yours as it may just crumble... perhaps some heat tape in that area will be a preventative maintenance issue?
- Also one possibility is some wire that has nothing to do with the knock sensor corrodes and grounds/shorts out and the knock sensor portion of the ECM is just the weakest path and that kills the ECM so the knock sensor could be a false indication of what is happening.
Click to expand...
have 2007 non abs. got code 25. have backup ecm... first changed knock sensor and sub harness.... did not see any visible damage to harness... took a few months to check due to weather..... went for 250 mile ride .....no fi lights.....still have backup ecm.......25000 miles on bike
 
Before spending money you have to make an accurate diagnosis.
I am going to explain step by step to make an accurate diagnosis and not waste money on unnecessary parts.
After suffering the breakdown and having the code 25 or 26, the first thing you have to do is exchange the 2 sensors, if the error code changes you have the broken sensor but if the code does not change you have to move on to the next test.
You have to exchange the cables of the side sensors, if the code changes you have a fault in the electrical installation but if the code remains the same the fault is in the electronic control unit of the motorcycle and then it must be repaired

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Last edited:
Andrew Shadow said:
Where did you have it repaired?
What exactly did they do?
i.e. Repair back to factory functionality or disable ability to register code 25/26.
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@MPR posted in this thread earlier last year. He fixes Gold Wings ECUs with the code, he said he managed to purchase the last few available Signal Processing chips for the Knock Sensing Circuit and can replace the failed one on the Wing ECU board.

However, he has no replacement chips for the ST...but claims he can still fix ST ECUs.....but doesn't want to go into what he actually does, unlike others who have tried (and failed) in their attempt to repair the ST ECU.

Not sure how he can revive the retarding on knock sensing when the chip is no longer talking to the CPU and cannot be replaced....and it is not easy to verify the functionality has really been reinstated.

His comment after asking for details....

MPR said:
I'm sorry but I'm not here to teach, I'm just trying to solve the problem.
Click to expand...
 
MPR said:
No cheating, no code overrides.
I repair it like when it leaves the factory
Click to expand...
You previously wrote that there are no parts available to repair this problem on the ST1300 ECM. This statement is what raised my curiosity as to how you fix it without the necessary parts.
If you are not willing to share your knowledge for the benefit of other ST1300 owners suffering from this problem that is your prerogative.

Are you willing to repair ST1300 ECM's for other ST1300 owners?
I do not need this repair but who knows about the future. I ask now on behalf of those who do need it as we are all just trying to find a solution to this problem for the benefit of everyone.
 
Friend, I am a professional and I have invested a large amount of time, effort and money to develop a solution.
Of course I am willing to repair broken units.
If there is anyone affected in Spain who wants to solve their problem, send me their ecu and then comment on the result.
I am also developing a specific website for this problem and to facilitate shipments from anywhere.
 
MPR said:
Friend, I am a professional and I have invested a large amount of time, effort and money to develop a solution.
Of course I am willing to repair broken units.
If there is anyone affected in Spain who wants to solve their problem, send me their ecu and then comment on the result.
I am also developing a specific website for this problem and to facilitate shipments from anywhere.
Click to expand...

Hola Amigo,

This is great news of course.

But all the very capable professionals over the world who have invested in trying to break into the ST1300 ECU over the last quarter century have failed.

It would be interesting to know what breakthrough allowed you to get there, even if you do not go into too many details to safeguard your trade secrets.

And also, how do you validate the repair? Do you have a set up where you can have a knock like input to the sensor and can show how it affects the ignition timing?

Gracias.
 
MPR said:
Friend, I am a professional and I have invested a large amount of time, effort and money to develop a solution.
Of course I am willing to repair broken units.
If there is anyone affected in Spain who wants to solve their problem, send me their ecu and then comment on the result.
I am also developing a specific website for this problem and to facilitate shipments from anywhere.
Click to expand...
Good to know.
When you have that website up and running don't forget to post it on here so we will all be made aware of what service you are offering.
 
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