I am working on a Honda Generator EB6500 and want to know if I can teat the throttle control unit on the control panel?

Provides information about the generator's status, performance, and reminders. The app also allows you to turn the generator on and off remotely, monitor fuel levels, and set the Eco-Throttle mode.
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After reading about Honda's Eco Throttle system available on inverter generators it seems it is not a fuel metering system but a computer controlled speed regulator or basically an electronic throttle.
Because the engine of an inverter generator doesn't need to run at a constant high speed to produce the correct 50 or 60 Hz output this generator can run at slower speeds when the load is light. The electronic throttle is the means to make it happen - operated by the computer.

The throttle is probably operated by a stepper motor and the power supplied to it likely to be in digital form. I suggest you try and gain a more full account of how the system works before you delve deeper.

Disconnect the auto choke assembly and hook up some sort of mechanism to manually open and/or close the choke. Spring load the choke so that the default position is fully open.

from your description and what you do , the problem is in the auto control unit
it will be in the system to reduce the rpm to idle when there is no load ( auto mains on off controller switching between genset and mains supply)
by turning the auto operation off you are committing the gen set to full rpms regardless of the power requirement
you have the option of having it fixed at an gen set repair shop or leaving it off and starting the genset only when you have a mains power outage
check with an electrician to ensure that it is possible to run it that way as if the mains power unit is not correct , when you start it and you still have mains power , it will destroy the gen set

oil switch is normally inside the motor.a continuity tester is used to check for ground.wire is located on the side normally fastened with a nut.please give me a model number if possible

if your engine shutting down, then your auto throttle is working.
when you hit the switch watch the throttle arm move on the carburetor to the idle position,if so you may have to clean the carburetor jet and fuel nozzle ports.possibly this occurs when unit has been stored for quite some time.once jets are cleaned it should maintain idle.

remove the throttle control motor spin motor a few times. I believe due to the minimal rotation required during activation a flat spot or build up results in a poor connection. Kicks down under load now. Back to the smoothnes of a new unit

Flashing D4 light is an error from the TCU (transmission control unit), so you got something going on with your transmission. If you want to pull the error code, remove the passengers side kick panel and look for a pair of wires with a blue connector at the end. Stick a paper clip or some other piece of wire into each hole of the connector to short the wires. Put your key in the ignition and turn 2 clicks. The D4 light will flash the code...short flashes=1 and long flashes=10. Add the number of short and long flashes to get your code. Errors are below:

0-Transmission control unit (TCU) faulty.
1-Lock-up solenoid 'A' circuit open or shorted.
2-Lock-up solenoid 'B' circuit open or shorted.
3-Throttle Position Sensor circuit open or shorted.
4-Vehicle Speed Sensor open or shorted - No signal from speedometer.
5-Shift Lever Position Switch circuit shorted.
6-Shift Lever Position Switch circuit open.
7-Shift Solenoid 'A' circuit open or shorted.
8-Shift Solenoid 'B' circuit open or shorted.
9-Counter shaft or transmission speed pulse generator open or shorted.
10-Coolant Temperature Sensor open or shorted.
11-Engine RPM (Ignition coil signal) open or shorted.
12-(No code 12 used)
13-Main shaft speed pulse generator open or shorted.
14-Linear (line pressure control) solenoid open or shorted.
15-Kick down switch circuit shorted.

Is that all you ran it was the one time? Sounds like a mouse. Or bugs got in there and built a nest, something just burning off. Get the air gun on that thing and blow it out, then try it again, hopefully it is just dust and dirt piled up in there.

Hi. There are 2 things that control the Auto Throttle and that is the idle control valve (Connected with black and yellow wires) and the Auto Throttle Unit.

Start Generator
Check for 12VDC on the Yellow wire of the idle control valve. Yellow is positive to any good Chassis ground. If you don't have 12VDC then either the Auto Throttle switch is bad or the Auto Throttle Unit iself.

You can gain access to the Auto throttle switch and again check for 12VDC to Ground on both sides of the switch with the switch on. (It may read as high as 13.8 engine running) If you don't get 12 - 13.8 VDC the the Auto throttle control unit is bad

If you have 12VDC to the Idle control Valve and it does not work perform a resistance check across the coil of the Idle control Valve (both wires disconnected Engine off) Black to yellow should read 3 to 4 Ohms If you have no resistance then the coil in the Idle control Valve is bad.

If you need more help just respond here

Kelly