Deere 544H park brake unresponsive

[mg2361]

What are the "voltage" measurements of the M12 and M13 wires with the key on and issue happening? Check the voltage measurements of your ground wires for the TCU (terminals 1 and 2) and the Monitor (terminal K) as well. They should be less than 0.100 V. I also attached a solution I found. Not your serial number but worth mentioning.

Hear is the diagnostics out of the manual (won't be much help):

F1653 No CCU Transmit

Wire M12 (Purple) Harness (W3) Open

Load Center Harness (W3)—M12 (Purple) Open (Check/Repair.)

Wire M13 (Purple) Harness (W3) Open

Load Center Harness (W3)—M13 (Purple) Open (Check/Repair.)

CCU (A2) CCU (Replace)

MDU (Reconfigure). See Monitor Display Unit Reconfiguration Access Service Menu

, Machine Model (S 01) , Tire Size (S 03) , Enable Options (S 06) , and Delete Service Codes in Group 9015—15.

F1655 No TCU CAN Transmit

Wire M12 (Purple) Harness (W3) Open

Load Center Harness (W3) M12 (Purple) Open (Check/Repair.)

Wire M13 (Purple) Harness (W3) Open

Load Center Harness (W3) M13 (Purple) Open (Check/Repair.)

Wire R02 (Black) Harness (W3) Open

Load Center Harness (W3) R02 (Black) Open (Check/Repair.)

TCU (A3) TCU (Replace)

MDU (Reconfigure). See Monitor Display Unit Reconfiguration Access Service Menu

, Machine Model (S 01) , Tire Size (S 03) , Enable Options (S 06) , and Delete Service Codes in Group 9015—15.

 

[shadowman1000]

volts , key on , M-12 2.30 volts , M-13 2.19 volts , RO-2 .000 volts , GO-1 .007 volts .
TCU volts at pin-1 .000 volts , pin-2 .007 volts . at monitor K wire .030 to .034 volts .
I don't know if this is important but I rechecked ohms at M-12 and M-13 (key off)and its now 67.1 , I checked M-12 with negative lead of meter to ground and got 13.36 , M-13 was 13.36 , GO-1 was 1.1 , RO-2 was 1.6

 

[mg2361]

Try measuring the M12 and 13 voltages again with each controller disconnected one at a time. The 12 and 13 voltages should add up to approx. 5 V. If at any point they do add up to 5 V then you found a problem controller. 67 ohms does not concern me however if you want to check them individually I attached their locations. They should be 120 ohms each.

 

[shadowman1000]

I had a few mins to do some checking today ,, I started out checking m12 & m13 by their self , I checked with terminating node installed and could not get a accurate reading , removed both nodes and retested , again didn't look right , showing 6.2 ohms on m12 and 8. to 10. on m13 . I was watching a big storm heading my way and knew I only had a few more mins so wanted to check volts as I disconnected each controller , I disconnected the tcu first , then remembered I should have done a new baseline volts first , so I turned main power off and reconnected tcu and turned main power back on . I looked at display and all was working normal , gear position , started machine , park brake released.. so if im thinking right its got to be tcu plug or pins loosing contact .

 

[mg2361]

Good possibility. Any time a connection is disturbed and then things work I would be checking the pins in the connector of the TCU for corrosion and fit. Then check the wiring near the TCU connector. I see many wires broken on various machines near or at the crimp of the terminal. Another possibility is a cracked solder joint within the TCU......Let's hope for wiring!

 

[shadowman1000]

everything is still working . im going to wait til it does it again before I look for the problem . I want to thank you for your help

 

[shadowman1000]

well , after 6 months of machine working as it should its back to doing the same thing . code 1655 no tcu transmit . I tried unplugging the tcu and replug like I did last time , no change .. I have all my notes from last time and I will go though everything again. if anyone has had code 1655 and found the problem

 

[shadowman1000]

MG2361 if I could ask for your help again .
only code is 1655 , everything else works as it should.
I rechecked M-12,M-13 and RO2 for continuity . ok
check ohms of M-12 , M-13 at TCU , CCU , term resistor . 63.3 ohms
at MDU term resistor. 64.3 , at MDU plug A and B. 65.4 ohms
checked volts at MDU , grounded at RO-2 , M-12 2.39 volts , M-13 2.28 volts .
moved ground to frame and rechecked M-12 1.94 volts , M-13 1.84 volts .
im sure I forgot to check something .
I did unplug the TCU and try to move the pins with my knife ,re plugged and it worked , park brake released , worked the machine for 1 hour . the next day park brake would not release , I repeated what I did the day before and no change .
I don't mind buying a TCU if im sure that's the problem but being a pricey part I need to be sure . cant find another machine to swap TCU's with .
I did replace the MDU recently and I didn't reconfigure it , could that affect the TCU ?

 

[mg2361]

The monitor should be configured. I am not sure if the configuration will cause your issue however. It is starting to sound like you need a TCU. Maybe a solder joint is broken inside the TCU??

 

[shadowman1000]

I have the file on the reconfiguring steps just never did it . the parking brake issue started long before the monitor was replaced .

 

[shadowman1000]

I reconfigured the monitor and had some codes because I didn't turn some things on and everything worked great for 3 days , I ran it everyday just to check . then on the 4th day it was back ,, dashes on the display, park brake would not release , 1655 code . BUT also codes 1664 (brake light pressure circuit), code 307 (tcu volts high), and have seen code 0339 (tcu sensor voltage short to ground) several times.
machine volts are a high of 27.9 just after start up and a normal of 27.6 volts , I checked at tcu and it matched battery display volts I spent a few hours with it today and could get the park brake to release but it would come back on in 40 seconds , while it was running I tried unplugging tcu and watching display as I plugged it back up , display would be right for 1 min the go to dashes . if I could get it to move 20 feet with out it locking up , it would work for hours .

 

[shadowman1000]

I took the tcu apart to look , everything looked normal other than a couple gray solder joints . got fairly aggressive with the wiring harness trying to see a change on the display .

 

[mg2361]

Just want to rule something out. Check the battery terminal at the alternator for AC voltage with the engine running. What do you have?

 

[shadowman1000]

AC volts ? I don't you mean DC ? its got 27.92 volts at the alternator , 27.83 at the starter , 27.97 on the display , at the tcu P02 27.79 volts , P24 26.92 volts , M 12-13 2.46-2.35 volts .
went back through the reprograming of the monitor and then park brake would release , shut it off and went back 2 hours later and NO park brake release . still have code 339 , 1664 , 307 , 1655

 

[mg2361]

Yes, AC volts. If you have more than 1 V AC (bad diode?) it could wreak havoc with the controllers.

 

[shadowman1000]

ok , glad I checked it .112

 

[mg2361]

Check voltage from TCU pins 1 and 2 (backprobe with connector connected to controller) when the engine is running. Should be less than 0.100 V DC. If higher check the ground at starter. If voltage is good then you may need a TCU.

 

[shadowman1000]

Check voltage from TCU pins 1 and 2 (backprobe with connector connected to controller) when the engine is running. Should be less than 0.100 V DC. If higher check the ground at starter. If voltage is good then you may need a TCU.

It is .006 volts , I went through my notes from months ago and it was .007 volts.

 

[shadowman1000]

I did notice this today . the main power disconnect is bad , machine will crank and start with switch in the off position

 

[dualtrade]

Hi did you ever resolve this issue? Have a similar fault with a 624H