Mahindra Max 22 won’t start

[YanmarFever]

Zippy,
Could it be a mouse chewed a wire or two in the engine compartment, or under the dash, have you inspected them with a flashlight?

 

[johnsonauto]

This tractor is baffling me. It will run start and run good. Then it will just shut off. Sometimes it will start again and sometimes it won’t.
Have replaced the load relay and the ETR solenoid. Checked, cleaned, put dielectric grease on several connections and no change.

I discovered that if I provide a ground to the electromagnetic pump, the tractor starts and runs. The wire come from the engine control connector J1 pin A3.

What I don’t know is, what signal is the computer looking for (or what input pin) should I be chasing?

I don’t want to put a new computer on the tractor and it does the same thing. Also, check engine light doesn’t come on. I don’t know if bulb is burnt out or if it is something else. Light doesn’t even come on when just turning the key on.

Any help is appreciated!!

Pull the fuse or wiggle the fuse for the ECM it is in the harness near the computer. I have seen the terminal loose their tension and make intermintent contact with the fuse. If that helps replace(splice in ) the fuse holder with a good quality one

 

[Zippy 96]

Tractor has been starting and running normally until a couple of days ago. Was running then sputtered and died. Wouldn’t restart. Pulled side panels and looked around but didn’t see anything obvious. Dad tapped on the ECU “saying I bet this is the problem” lo and behold, it started up and ran. It continued to run until we got it to the shop and turned it off.

Does anyone know of a way to test or a place that rebuilds these computers? I hate to spend $2K on a new one. (Yes, we checked the external connections)

 

[Zippy 96]

Zippy,
Could it be a mouse chewed a wire or two in the engine compartment, or under the dash, have you inspected them with a flashlight?

 

[Zippy 96]

Yes, I’ve inspected a lot of the wiring on this tractor thinking that’s been the problem with it not starting. I have found some wiring issues and corrected the problems.

These wires were at the back of the engine. I ended up pulling the fuel tank to get to it.