John deer 225c lc auto idle not working

[Raptor exc]

My deer 225c lc have a high idle even at lidle position on the dial and the auto idle is not
Working but the green light is on.when I turn the key to off position the rpm goes down to 200rpm an then goes back up

I don’t know where to start
Help please

 

[Diesel Dave]

Welcome to HEF Raptor .
Get into the service mode on your monitor in the cab. To do that press and hold the set button then key on or start. After bulb check release the button. Then use the select button to scroll.
Scroll until the number 8 is on the left side of the screen. That is your rpm dial voltage. What is the low idle voltage and the high idle voltage? Does the voltage change smoothly through the full range?

 

[Raptor exc]

I will try tomorrow but I don’t think there is a service mode in my 225c

 

[Diesel Dave]

I will try tomorrow but I don’t think there is a service mode in my 225c

I would be very surprised if it didn’t have service mode

 

[mg2361]

but I don’t think there is a service mode in my 225c

Yes, it has a service mode.

 

[Raptor exc]

4.4 in high idle and 0.5 in low idle yes it work smoothly through the range

 

[mg2361]

When you are in service mode, have a zero on the left, any number other than zero on the right?

 

[Raptor exc]

The lowest rpm I can get is1380 an the highest is 2075. All the fuse behind the seat are good. All the throttle linkage works smoothly when unattached to the electric motor.the electric motors is working except that he don’t go down enough ???

 

[Raptor exc]

O on the left 0 on the right

 

[Steve Austin]

Did this happen suddenly? Have you had injection pump off for rebuild or replace? Or any other repairs?

 

[Raptor exc]

Was working perfectly at the end of the day
Next morning when I started it it was reving high.
And auto idle was not working

 

[Steve Austin]

Does it rev up as soon as it starts, or do you have to lower pilot shut off lever than it revs up?

 

[Raptor exc]

It revs up as soon as i starts

 

[Steve Austin]

In your first post you state that when you turn key to off RPM goes down to 200 than goes back up.
So, meaning it will not completely shut down right.
Sounds like EC motor has lost its calibration settings if I am thinking about the right model.
I don't have the calibration procedure for this excavator.
If I remember correctly there is an engine speed control motor position sensor in
the motor housing.
It would not be unusual for the motor or the sensor to fail suddenly but i would thank this should generate a code.
Go into service menu with key on engine off and look at all the function sensors to see if they all read near zero. Just to verify that you don't have a sensor reading pressure when it should not be causing the controller to do some weird stuff. Also perform same check engine running pilot shut off lever up.

 

[Raptor exc]

if the ec motor as lost his calibration will it affect auto idle and auto acceleration?
i will try this tomorrow
Thanks

 

[Raptor exc]

When the engine is off whit lever up pump pressure,pump flow and pilot pressure are at zero.
When engine is on
L1-e
L2-e
0-0
1-0
2-0.3
3-0.3
4-0.1
5-0.0
6-750
7-2.5
8-0.5
9-0.1
A-0.1
B-0.0
C-0.0
D-0
E-0.0
F-0
Engine on lever down
L1-e
L2-e
0-0
1-0
2-0.3
3-0.3
4-1.1
5-1.1
6-750(but real rpm is 1375)
7-2.5
8-0.5
9-0.0
A-0.0
B-0.0
C-0.0
D-0
E-0.0
F-0
does the 7 and the 8 should be the same?
Thank for your help

 

[Steve Austin]

I am not sure what function sensor # 7 refers to as i only have info on a 160CLC but 2.5 should be MPA reading which equals to 362 PSI I would thank it should read in the zero range like the others.
May be Diesel Dave or MG can furnish you the monitor data items list. for the 225.

 

[Raptor exc]

I think it is the same as zx225 hitachi

 

[Diesel Dave]

does the 7 and the 8 should be the same ?

No , EC angle voltages and Dial angle voltages are different.
See screenshot below.
.

.
Yes , a Deere 225C is the same as a ZX225US

 

[Diesel Dave]

When you turn OFF auto idle ,what is your engine speed at idle ?
Does Front Att operation item “d” (in the monitor list) register a 1 when operating any dig function ?