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D5G XL Park brake came on when using

CM1995

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Me neither as the electrical side of things either building or machinery is my weakest knowledge. Just sharing what we've been through.
 

mike holcomb

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Confirmed that you are on the correct solenoid.

Can you hear it clicking when you apply the 11.5v to it.? If you can't hear it clcking that could be a clue. You might have to remove it from that block

You might get different results with it connected to the machine harness. Do you have any way of back-probing the connector so that you can measure the voltage with it hooked up to the machine.? Also maybe try measuring the voltage with the engine running.?

Solenoid coil resistance specification is 10.16 ± 0.20 ohms, so that is OK.

I'll be honest and say that I am not at all happy with the 11.5v. I'm harking back here to what @CM1995 said in respect of battery condition. I know you have no spare batteries and that makes things more complicated but I'm not happy at all with that voltage.

EDIT: Get on the pressure switch (Ref #5 in Post #32 above) as well. Check the switch contacts, they should be closed. See if the contacts open when you energize the circuit to the park brake solenoid but this will require the engine to be running. My suspicion is that they will stay closed.

BTW I will be stepping out shortly and will be out for the rest of the afternoon. Answers to questions may take longer as a result.........
Do u have any idea what this brake pressure switch looks like? I can't seem to find it. I follow diagram but it looks like it goes to a ground right where #5 is circled. Unless I'm missing it?
 

Nige

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This is the best view I have. Follow the hose #1 (arrowed) that goes round the back side would be my best suggestion. That hose lands up very close to the pressure switch, probably in some sort of manifold or other that is not shown. From the illustrations I get the impression that the switch might be a lot lower down in the machine than you think it is.

1686247287737.png1686247391773.png
 

mike holcomb

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Ok , I see that, I thought that was a speed sensor because it was on outside of drive. Let me check
 

mike holcomb

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Wires fell off as soon as I went to unplug, figures. I have 5v at plug with brake on or off
 

mike holcomb

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Ok, let me get on the horn, I asked about it this morning when I was there, they didn't have it. I probably have oring in my kit. Thanks for your help, I was starting to get frustrated
 

mike holcomb

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That's not good. Switch is probably buggered.
201-4159 is the Part Number, plus it needs a a 3J-1907 O-Ring.
I have oring, if I pull that sensor out, is it gonna keep flowing oil, or it'll stop at level
 

Nige

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I have 5v at plug with brake on or off
That 5v will be the pull-up voltage generated from inside the ECM.
Just as a test do you want to try jumpering the two pins in the harness connector on the machine side for that switch.?
With the engine running the instrument panel should register "park brake off" even before you throw the switch. If that happens you know you've cracked the problem.
I have oring, if I pull that sensor out, is it gonna keep flowing oil, or it'll stop at level
Simple answer, don't know. Personally I would leave it in there until you get a replacement then swap them out quick. BTW it's only a pressure switch, not a sensor. It opens at approx 58psi with rising pressure, closes at 50psi with falling pressure.

1686249232196.png
 

mike holcomb

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That 5v will be the pull-up voltage generated from inside the ECM.
Just as a test do you want to try jumpering the two pins in the harness connector on the machine side for that switch.?
With the engine running the instrument panel should register "park brake off" even before you throw the switch. If that happens you know you've cracked the problem.

Simple answer, don't know. Personally I would leave it in there until you get a replacement then swap them out quick. BTW it's only a pressure switch, not a sensor. It opens at approx 58psi with rising pressure, closes at 50psi with falling pressure.

View attachment 287893
No good, light still on with a jumper in the plug
 

mike holcomb

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No jumper wire, no light, put jumper in light comes back on. I did bring another meter to check batteries, they do have 14.+ while running, 12.5 off
 

Nige

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No jumper wire, no light, put jumper in light comes back on.
Sorry that was me being stupid. As can clearly be seen from the schematic above the switch contacts are CLOSED when there is no pressure (park brake ON) and OPEN when there is pressure (park brake OFF).

If you can change the status of the light by installing/removing the jumper I would say that you've found your problem.
 
Last edited:

mike holcomb

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Good to know, I wish I looked better yesterday, oh well lesson learned. I probably should've walked away when I started getting frustrated, up down,crawling under 25 times haha
 
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