M-Tronic diagnostics

[Mechanix365]

Does anyone know if you can diagnose a no spark condition on an m-tronic saw without the mdg-1? I have an MS362c-M and it wont fire. I'd rather not just start throwing parts at this saw. With proprietary communications through the mdg-1 to the sds (which, btw, does anyone also know if you buy a MDG1 if you get access to the sds without being a dealer?) I cant tell if its a solenoid, tps or coil/microprocessor. (I was told the micro is part of the coil and "talks" via multiplex to the carb). Learning the new tech for an old orange screwdriver guy is gonna be fun. Thank you for any help/input.

 

[cscltd]

Continuity tester can check wiring for shorts.
new plug, check plug boot wire making contact wire plug wire
solenoids are reasonable in price to swap out.
if still no-might be module in most cases.

 

[bwalker]

Does anyone know if you can diagnose a no spark condition on an m-tronic saw without the mdg-1? I have an MS362c-M and it wont fire. I'd rather not just start throwing parts at this saw. With proprietary communications through the mdg-1 to the sds (which, btw, does anyone also know if you buy a MDG1 if you get access to the sds without being a dealer?) I cant tell if its a solenoid, tps or coil/microprocessor. (I was told the micro is part of the coil and "talks" via multiplex to the carb). Learning the new tech for an old orange screwdriver guy is gonna be fun. Thank you for any help/input.

If it has no spark it's not the solenoid. I would check the ground and the switch put closely.

 

[SimonHS]

Does anyone know if you can diagnose a no spark condition on an m-tronic saw without the mdg-1?

You can tell whether there is a spark or not, but diagnosing why there is no spark might be difficult if something is wrong with the electronics, rather than a bad earth or bad plug etc. Stihl recommends the Zat 4 spark tester, part number 5910 850 4503.

btw, does anyone also know if you buy a MDG1 if you get access to the sds without being a dealer?

Yes, the Stihl software can be downloaded, at this point in time. It asks for dealer details but let's you skip that question if you are not a dealer. I hope that Stihl does not lock the software down to dealers only in future.

I've attached a 2019 Stihl diagnostic manual which has some good m-tronic info. There will probably be a newer version this on the internet somewhere by now.

 

[SteveInOregon]

Does anyone know if you can diagnose a no spark condition on an m-tronic saw without the mdg-1? I have an MS362c-M and it wont fire. I'd rather not just start throwing parts at this saw. With proprietary communications through the mdg-1 to the sds (which, btw, does anyone also know if you buy a MDG1 if you get access to the sds without being a dealer?) I cant tell if its a solenoid, tps or coil/microprocessor. (I was told the micro is part of the coil and "talks" via multiplex to the carb). Learning the new tech for an old orange screwdriver guy is gonna be fun. Thank you for any help/input.

I have the same saw.
After using it daily in my one man tree service I have had most of the "common issues" with this model saw.
So I started watching The Saw Guy - YouTube channel.
He is thee chainsaw authority out here in Oregon.
One of the common issues with our saw in particular he says is the red wire in the wire harness goes bad but you can't see it visually.
Search for West Coast Muscle Saws Stihl MS 362 Issues.
Hope this helps.

 

[Jaws]

Yes, the Stihl software can be downloaded, at this point in time. It asks for dealer details but let's you skip that question if you are not a dealer. I hope that Stihl does not lock the software down to dealers only in future.

How do you do that? I just tried it and they tried to get me to sign in as a dealer.

 

[SimonHS]

How do you do that? I just tried it and they tried to get me to sign in as a dealer.

The download part or the 'skip dealer details' part?

I've not needed to run the software for a while, so I'll fire it up later and see if it is still working for me.

 

[Jaws]

Both

 

[SimonHS]

Both

It is still working for me.

I've sent a PM to you.

 

[stihltech]

Check wiring and grounds. If OK replace module. Don't let the "OMG it has a computer!" mentality get you sidetracked. We are not spending too much time in the shop on his. It still has a coil, wiring,and a plug wire. Keep it simple.

 

[Jaws]

It is still working for me.

I've sent a PM to you.

Got it Thanks alot.

 

[av8or3]

Select “thumbs down” when asked to enter dealer info.

 

[redwoods]

Having problems with a Stihl MS 241C MTronic.
So far I have replaced the piston and rings. Compression was very low.
Replaced all the carb diaphragms and gaskets.
Replaced the Solenoid Valve 0000-120-5110 ( Black One )
Checked Fuel Line Filter.
Saw will only start if mix is poured into cylinder and then uses that fuel. Does not stay running.
Wondering if it is a break in the wiring to the solenoid. No means to getting the Stihl Diagnostic Software
Any one any ideas ?
Thanks.

 

[lone wolf]

Having problems with a Stihl MS 241C MTronic.
So far I have replaced the piston and rings. Compression was very low.
Replaced all the carb diaphragms and gaskets.
Replaced the Solenoid Valve 0000-120-5110 ( Black One )
Checked Fuel Line Filter.
Saw will only start if mix is poured into cylinder and then uses that fuel. Does not stay running.
Wondering if it is a break in the wiring to the solenoid. No means to getting the Stihl Diagnostic Software
Any one any ideas ?
Thanks.

Carb comes to mind, maybe the whole problem from your description.

 

[redwoods]

Carb comes to mind, maybe the whole problem from your description.

Ok Thanks for that.Still difficult to diagnose which part of the carb or the Mtronic wiring is failing. Any Ideas?.
Thanks

 

[lone wolf]

Ok Thanks for that.Still difficult to diagnose which part of the carb or the Mtronic wiring is failing. Any Ideas?.
Thanks

Well, look at the wiring and or test it with an OHM Meter.
What is the compression now, and did you use China parts?
Since it starts and dies after you put in fuel, it sounds like the carb.

 

[bwalker]

I bet carb and not the Mtronic part.

 

[stihltech]

Back to basics. For get about the solenoid for the time being. Wiring check with an ohmmeter as above. Don't forget grounds. No circuit no run.
Fuel system check starting with the fuel. Filter, hose, connections and vent. What does the inside of the carb look like. Still just a carburetor. Clean with NO corrosion. Does the pulse have a pulse?
Spark. Does it continue as long as the saw does run, or does it shut of first?
If vacuum and pressure test are verified, verify everything else before adding parts.

 

[redwoods]

Well, look at the wiring and or test it with an OHM Meter.
What is the compression now, and did you use China parts?
Since it starts and dies after you put in fuel, it sounds like the carb.

Thanks for your info. I will take off the Mtronic wiring and test it.
The piston was not a Chinese made one. German made.
The compression is very good.85 compared to 65
It should start at 85.
Did notice that fuel was not getting to the bottom diapragm in carb.Maybe the needle valve not opening.?
Thanks
Colin

 

[lone wolf]

Thanks for your info. I will take off the Mtronic wiring and test it.
The piston was not a Chinese made one. German made.
The compression is very good.85 compared to 65
It should start at 85.
Did notice that fuel was not getting to the bottom diapragm in carb.Maybe the needle valve not opening.?
Thanks
Colin

Well the compression should be 160 PSI that gauge must be way off, cross-check it .