Inching pedal sensor on GENIE GTH-4013, info needed

Hi guys, i'm new to this forum.
I'm having some troubles with a genie telehandler. Equipment runs ok except for a low speed forward transmision.
Found some wiring disconected below the pedals, acording to the manual, they should go to the inching pedal sensor.
Machine "thinks" pedal is being pressed and so wont go forward fast.
Simmulated PWM signal to the valve and it moved OK, just a bit inconvenient to be moving a duty cycle potentiometer with the hand and accelerating the engine with the foot at same time, hehe.

Pedal assembly seems to be missing that sensor and the mounting hardware for it. Spare part is impossible to get here so we will try some diy solution.
Does anybody know what kind of sensor it is? potentiometer? which value? attached to pedal rotation axle? any pictures of it?
0v and 5v voltages are ok on the wires that were found disconnected, and the third wire is the return signal according to the electrical diagrams.

thanks in advance!
greetings to all from neuquen, argentina.

Well if you can not get spare parts its going to be hard to come up with a solution. What spec machine is it ? Was it imported from the US or is it a machine built for non the non US market. That will make a difference. You not only need reference voltage but you also have to provide off idle validation. Its not as simple as just hooking up any a switch and making things work

its us spec'd.
i know its not a simple switch, thats why i'm looking for some data. the only parts missing are sensor and its assembly.
simulating PWM to the valve, the machine moves proportional to the duty cycle (or sort of). as it is, PWM from controller is about 25% and vehicle moves slowly. if accelerator is pressed, the engines revs up ok but pwm sits around 25% and machine moves slowly.
we are thinking pwm is not increased beacause controller doesn't receive signal from inching pedal sensor and gets in failure mode, fixing the output to a low speed. thanks.

Does your missing switch mount to the pedal its self or is the pedal hung under the dash ? What's your serial number or what service manual revision are you looking at. And what engine do you have

So its basically two switches in one switch. A Tps and ivs. Tps sends signal to the ecm as a request for throttle response proportional to the position of the pedal you will have Avs voltage, signal and ground. Ivs will have voltage, throttle active, idle active. Ivs is usually around 25% request before active idle switches to throttle active.WOT is usually 75 to 80% of voltage. Then depending on the engine it could be pulse width modulation which is a little different

Txhayseed said:

Does your missing switch mount to the pedal its self or is the pedal hung under the dash ? What's your serial number or what service manual revision are you looking at. And what engine do you have

Click to expand...

it mounts to the axle of the pedal, right below the "floor" of the cabin. engine is a perkins diesel, will get you serial number by tomorrow. thanks!

Txhayseed said:

So its basically two switches in one switch. A Tps and ivs. Tps sends signal to the ecm as a request for throttle response proportional to the position of the pedal you will have Avs voltage, signal and ground. Ivs will have voltage, throttle active, idle active. Ivs is usually around 25% request before active idle switches to throttle active.WOT is usually 75 to 80% of voltage. Then depending on the engine it could be pulse width modulation which is a little different

Click to expand...

in this case throttle pedal has only a mechanical cable that goes to the engine, and no electronics whatsoever.
the other pedal has the hydraulic controls for the brake, a brake light switch, and the remainings of the inching sensor thar's missing.
speed control is controlled by pulse with modulation. using the machine as it currently stands, that PWM doesn't go further than 25%(viewed in the scope) (about 3v mesured with voltmeter). we applied a generated PWM to the coil and increased duty cycle at the same time we accelerated the engine, and the machine speed increased perfectly.
thanks!!

this is the wiring diagram that looks like our machine.
and that's the missing sensor. 5v and 0v are OK in the disconnected wires coming from controller.
(its page 142 of GTH-4013 sx From serial n.: 19275 GTH-4017 sx From serial n.: 19300 service manual)

thanks a lot guys!

apparently direct posting is not allowed for this image hosting... let's see if some of these work.

https://i.postimg.cc/6q2YL20M/incing-pedal-genie-gth-sch.jpg
https://postimg.cc/RJm7v02t

sticker says:

gth 4013sx
year 2010
rough terrain variable reach truck
serial 20667
2010
made in italy