Bad news big repair

[Hay Dude]

I would look at the relays in the existing system. With two relays does each relay provide power to half the glow plugs.
Or does one do preheat and one do after start heat.
You may wish to ohm out the connections to the relay coil to see if one goes to ground constantly or if they are having constant power applied and switching the ground through the ecm.
If they are standard 5 pin relays get some #22 wire and slip it in the relay coil contacts to see if the relays are being activated. You can look for voltage to be applied to either contact of the relay coil if you have voltage on both pins you will know they are switching the ground with the ecm.
Once you know what they where attempting to do run a wire to the existing relay through a switch to either power or provide a ground.
That should allow you to control the glo plugs and get her started much easier and smoother.

Stop on down.
I can bring beer and great take out food.
Had my ass up in that engine compartment enough….

 

[Hay Dude]

In the 4 hours you've been debating with people trying to help you you could have found out if disconnecting the glow plug buss from its power supply caused the engine to derate.
I'll bet the sensors are all two wire sensors with power and returning signal. The glow plugs are a single connection= power in.
That's how a sensor signal failure CAN derate the engine but an open circuit between the glow plugs and their power supply will not.
I think I'm done here until there is some meaningful information forthcoming.

Repair tech says no, I already asked. That doesn’t mean he’s right though.
Man do you get annoyed at anything/anyone you don’t agree with

 

[IndyJay]

Comes back to earlier discussions on "Right to Repair" and long term ownership ECU based systems.... sorry this doesn't offer any help to HayDude with current problem.

Warranty Claims & Reliability

Agreed. The problem facing the consumers of this compact market segment is the high technology electronics that the federal government has pushed the tractor manufacturers into using to meet their final tier IV emissions standards. If you look at the industry as a whole, all the manufacturers...

www.tractorbynet.com

 

[5030]

Gee, I remember you telling me everything you owned was pre 4. Guess you fibbed. Neither of my M's have a black box, thank goodness.

 

[Hay Dude]

Gee, I remember you telling me everything you owned was pre 4. Guess you fibbed. Neither of my M's have a black box, thank goodness.

What the heck are you talking about?!
An ECU box and emissions aren’t the same. An ECU could be used to do many things- with or without emissions!
I don’t fib.
My 99 Ford Powerstroke had a PCM and no emissions. You don’t know what you’re talking about.

 

[RickB]

Repair tech says no, I already asked. That doesn’t mean he’s right though.
Man do you get annoyed at anything/anyone you don’t agree with

I'm not looking at a $6K repair bill and nitpicking a possible $100 workaround from the sofa.

 

[K5lwq]

I think the same as it monitors the air temp sensor and the water temp sensor

No sir. It can not because that wire is connect to the relay not the ECM. It is just like a fussed wire going straight to the battery. The relay is a switch that makes the connection. The ECM can not handle the amp draw of a glow plug.

However, you can spend your money anyway you wish. I would have put a relay and switch on once I had diagnosed the rest of the circuit was good. This is much more reliable solution than the factory set up.

 

[Hay Dude]

I'm not looking at a $6K repair bill and nitpicking a possible $100 workaround.

Chill out!
Just because I haven’t tried it yet doesn’t mean I refuse to try it. I worked all day and it’s dark and I don’t feel like it right now. It’s sitting outside in the dark.
Besides, repair tech says he thinks it’ll throw a code.
Maybe I will try it…
Talk about impatient, give me a chance and maybe in between all the other crap I have to do, I’ll try it! Maybe someone here knows another way. It’s why I started the thread in the first place!

 

[Hay Dude]

No sir. It can not because that wire is connect to the relay not the ECM. It is just like a fussed wire going straight to the battery. The relay is a switch that makes the connection. The ECM can not handle the amp draw of a glow plug.

However, you can spend your money anyway you wish. I would have put a relay and switch on once I had diagnosed the rest of the circuit was good. This is much more reliable solution than the factory set up.

I’m not saying I won’t. I hit this dead end Friday afternoon. I worked all day today except a few posts on TBN from my Iphone.
Will visit the idea this week.
So try to understand I’m trying to get the factory system working before I install a work around. That’s my first preference. The purpose of the thread was to inquire if there’s anything else I may have overlooked to get the FACTORY system working.

The explanation I was given is that the ECU can detect the failure of the glow plugs. It doesn’t make much sense to me, either since the tractor starts and runs without glow plugs when warm.

 

[Hay Dude]

Something occurred to me that I did not check:

What if the ECU harness plug got moisture in it and corroded contact(s)?
Maybe the glow plug circuit pin is corroded where it plugs into the ECU?