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cat 297c

Chrisso

Senior Member
Joined
Apr 6, 2021
Messages
451
Location
Australia
Occupation
Diesel Mechanic
Just to throw in, in case I’ve missed it, but have you checked the park brake/hydraulic lock switch is okay?
Must admit I thought of that too, but the active 2476-3 and 2474-3 voltage above normal codes will jam on the park brake.

We've also found why the codes are active...
If the LH joystick is not getting power on the 126 pink wire then neither are the 4 PWM signal wires that return to the ECM. The ECM detects this and sends a voltage down those signal wires "above the normal working voltage" of that PWM signal.

Do you have 12v measured between the outlet side of the fuse (red arrow) and machine frame ground.?
While you are in there it might pay you to make sure there is power at the input side of the fuse (blue arrow).
Both of the tests above are done with the key ON.
Eager to know the answers to Nige's last question above.
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
That sounds as though you were doing it right.
If you have no power on the C126 pink wire at the joystick end you need to go back to the top half of the fuse box, fuse A4. That is the other end of the same C126 wire.
Do you have 12v measured between the outlet side of the fuse (red arrow) and machine frame ground.?
While you are in there it might pay you to make sure there is power at the input side of the fuse (blue arrow).
Both of the tests above are done with the key ON.

View attachment 297015
Nige, I rechecked every fuse, A box and B box from top to bottom, every one was getting 1.2-1.5v from powerside of fuse to the other side of fuse. I went back under cab and rechecked all connections with a red cap and all had 12volts.. I rechecked the two plugs with yellow wire and black wire and unplugged they are getting 12volts
 

Nige

Senior Member
Joined
Jun 22, 2011
Messages
29,737
Location
G..G..G..Granville.........!! Fetch your cloth.
I rechecked every fuse, A box and B box from top to bottom, every one was getting 1.2-1.5v from powerside of fuse to the other side of fuse.
That was not my question.
Go back to the snip taken from the electrical schematic that I attached to Post #57 on the previous page. Specifically for fuse #A4 (power supply to LH joystick base - only live when key is ON) check:-

1. From input (bus bar) side of fuse to machine frame ground as indicated by the blue arrow.
2. From output side of fuse to machine frame ground as indicated by the red arrow.

Report your findings.
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
Must admit I thought of that too, but the active 2476-3 and 2474-3 voltage above normal codes will jam on the park brake.

We've also found why the codes are active...
If the LH joystick is not getting power on the 126 pink wire then neither are the 4 PWM signal wires that return to the ECM. The ECM detects this and sends a voltage down those signal wires "above the normal working voltage" of that PWM signal.


Eager to know the answers to Nige's last question above.
i rechecked today and the all fuses are getting the range of 1.2-1.5 range on both power in side and power out side of fuses. I went back under the cab and the two plugs that are a yellow and.. black wire are getting 12volts with unplugged to the yellow wire on both. If i am understanding it correctly these two seperate components go to the fuse box , one to the top half set of fuses and the other to the bottom set of fuses. Not sure what to test here are to replace the two boxes that the yellow and black wire plug in to or what from here
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
That was not my question.
Go back to the snip taken from the electrical schematic that I attached to Post #57 on the previous page. Specifically for fuse #A4 (power supply to LH joystick base - only live when key is ON) check:-

1. From input (bus bar) side of fuse to machine frame ground as indicated by the blue arrow.
2. From output side of fuse to machine frame ground as indicated by the red arrow.

Report your findings.
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
That was not my question.
Go back to the snip taken from the electrical schematic that I attached to Post #57 on the previous page. Specifically for fuse #A4 (power supply to LH joystick base - only live when key is ON) check:-

1. From input (bus bar) side of fuse to machine frame ground as indicated by the blue arrow.
2. From output side of fuse to machine frame ground as indicated by the red arrow.

Report your findings.
yes sir, the reading for #A4 was 1.2 on the powerside of fuse and on the other side of fuse. Every fuse had a similiar reading . I checked my meter and measured the battery just to make sure and it read 12.5 volts.
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
yes sir, the reading for #A4 was 1.2 on the powerside of fuse and on the other side of fuse. Every fuse had a similiar reading . I checked my meter and measured the battery just to make sure and it read 12.5 volts.
what do you mean from busbar side.. at the fuses or from the back of fuse box
 

Nige

Senior Member
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29,737
Location
G..G..G..Granville.........!! Fetch your cloth.
If your readings are correct then nothing electrical should be functioning. Certainly the engine should not start.
what do you mean from busbar side.. at the fuses or from the back of fuse box
See the illustration below. Blade fuses like the ones used in your skid steer have two small holes (circled), for want of a better expression, in the top of the fuse.

As you look at the fuse A4 in your fuse box the RH side "hole" corresponds to the input side of the fuse and the one on the LH side corresponds to the output side. Put one probe of your multimeter the appropriate hole and touch the other one to machine frame ground to measure the voltage at that point.

1698424603531.png
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
If your readings are correct then nothing electrical should be functioning. Certainly the engine should not start.

See the illustration below. Blade fuses like the ones used in your skid steer have two small holes (circled), for want of a better expression, in the top of the fuse.

As you look at the fuse A4 in your fuse box the RH side "hole" corresponds to the input side of the fuse and the one on the LH side corresponds to the output side. Put one probe of your multimeter the appropriate hole and touch the other one to machine frame ground to measure the voltage at that point.

View attachment 297436
yes sir, every single fuse section A and B box all read 1.2-1.5 on both sides of fuse. Including A4 was 1.2. I will recheck to make sure i had my meter on the correct setting but i did measure the battery and it said 12.4 volts and i remeasured the two different yellow wires under cab and they read 12.4 volts as well. I am thinking I may need to look at the connection on the back of the fuse boxes???
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
yes sir, every single fuse section A and B box all read 1.2-1.5 on both sides of fuse. Including A4 was 1.2. I will recheck to make sure i had my meter on the correct setting but i did measure the battery and it said 12.4 volts and i remeasured the two different yellow wires under cab and they read 12.4 volts as well. I am thinking I may need to look at the connection on the back of the fuse boxes???
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
yes sir, every single fuse section A and B box all read 1.2-1.5 on both sides of fuse. Including A4 was 1.2. I will recheck to make sure i had my meter on the correct setting but i did measure the battery and it said 12.4 volts and i remeasured the two different yellow wires under cab and they read 12.4 volts as well. I am thinking I may need to look at the connection on the back of the fuse boxes???
Nige, ok I'm making very small progress but I'm making progress. I didn't have a good ground...EVERY FUSE is getting power including A4.. pink at joystick plugged in and ground tester to Frame shows 12v.. when I plug my black tester into 203 black wire at joystick connector there is no power
 

Chrisso

Senior Member
Joined
Apr 6, 2021
Messages
451
Location
Australia
Occupation
Diesel Mechanic
pink at joystick plugged in and ground tester to Frame shows 12v.. when I plug my black tester into 203 black wire at joystick connector there is no power
That'll also produce a -3. You found the problem again :)
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
See the illustration below. Disconnect the 6-pin connector next to the joystick back and with the key ON measure betweeon the following points:-

1. Pin 1 (126 Pink) and machine frame ground.
2. Pin 1 (126 Pink) and Pin 2 (203 Black).

View attachment 297458
Yes sir... pink to ground Frame 12.2v..
Pink to black 12.2v
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
Must admit I thought of that too, but the active 2476-3 and 2474-3 voltage above normal codes will jam on the park brake.

We've also found why the codes are active...
If the LH joystick is not getting power on the 126 pink wire then neither are the 4 PWM signal wires that return to the ECM. The ECM detects this and sends a voltage down those signal wires "above the normal working voltage" of that PWM signal.


Eager to know the answers to Nige's last question above.
fuses
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
fuses are actually getting all battery voltage, to and through fuses, battery power to A4 and battery power to lh joystick pink un plugged to ground frame and power to pink and through black wire 203. with plug plugged together and probe in pink and other probe in black there is no power
 

Paul Wade

Well-Known Member
Joined
Jul 13, 2023
Messages
63
Location
texas
Mr. Nige, can you please send me testing for the righthand joystick for codes 2475 & 2477.
The code occurances were roughly 56 times where as the left hand joystick codes were only 4. I talked to a guy who had plugged a computer up to it a few months ago and he told me that
 
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