X595 Fuel solenoid, and relay problems

MadDog304 · 2025-09-27T20:03:29-0400

Shadetree mechanic here. So, went to replace the battery on my X595 diesel and accidentally dropped a terminal cable and saw a spark. After that, the tractor would crank over but not start. I noticed that when you turned the ignition switch on, I did not hear the click for the fuel solenoid. Figuring that’s what it was, I ordered one and my neighbor who is a diesel mechanic installed it. Still, however, we did not hear the click so he removed the relay under the dash and jumped the wires and we heard the click and the tractor fired right up. So, his opinion was the relay was bad. He he has actually gone out of town for a few days so I cannot follow up with him.

Bought a relay at Advance Auto that matched perfectly and snapped it in and the tractor will not fire. It will crank but not start. Thinking that since he jumped the wires and the solenoid acted normally, I thought we possibly bought a bad relay. Went to another auto parts store and tried a different brand and same same, it will not start.

So, trying to figure out what the next step should be. Hoping it could be something simple and not have to take it into the dealer.

FredM · 2025-09-28T03:14:14-0400

Could be as simple as a faulty ignition switch, are you hearing the fuel cut solenoid work when the ignition switch is switched to run position?.

MadDog304 · 2025-09-28T08:06:43-0400

No… actually not.

FredM · 2025-09-28T10:20:43-0400

I am attaching an info sheet that shows what the corresponding numbers do, read this a couple of time slowly to ingest the meanings.

I am also going to point out that pin 85 is the earth pin, use a multimeter set to ohms with a probe inserted in the connector that matches pin number 85 to make sure that the earth is active from the connector to a clean earthing point on the tractor, otherwise the relay wont work.

If you remove the connector from the relay and take note of the pin numbers, pin number 86 is the ignition switch activator, pin number 30 is battery supply, use the multimeter set to DC voltage with the red probe in pin 86 on the connector with ignition switch in the run position and the black probe to a good earth checking for power supply, and the same with the multimeter for pin position number 30 for battery supply.

Don't worry about pin number 87A in your instance.

MadDog304 · 2025-09-28T16:01:19-0400

I’m leaning toward thinking it’s the ignition control module and switch. I’m having someone hopefully test it for me using the comments above.
On the ignition control board, there is a green and red LED… the green one is on… red is off… what does red mean?

FredM · 2025-09-28T17:13:49-0400

Usually red means "stop, don't use, check for problem, red has many meanings, caution is the main reason though.

MadDog304 · 2025-09-28T20:15:30-0400

So, we tested some more today and the DCM… part TCA12346 seems to be the culprit. The tan and blue wire are showing a high resistance… so hopefully thats it… expensive part!

FredM · 2025-09-28T22:15:58-0400

Probably if the machine was mine, I would try and find a wiring diagram and trace the wires to and from the DCM, with the purpose of removing it altogether and doing a wiring mod, but that is me!!.

Hopefully that is the problem, expensive if it is not though.

oletrapper · 2025-10-02T07:29:19-0400

Try changing fuse F2. Might be your problem. Should be above the relay. jmho

OT

X595 Fuel solenoid, and relay problems

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