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 on: March 23, 2019, 02:17:05 AM 
Started by blekfleg - Last post by spit051261
You need a drawing to check it out dude .
There are plenty here for EFI .

 on: March 23, 2019, 02:05:18 AM 
Started by Lassen88 - Last post by spit051261
With a voltmeter and see what the readings are at no throttle , half throttle and full .
Post the results here and we can see if it's playing up  :)
I think you need to check between LY and GR cables from the TPS. OB is the feed .
I think  ???
Looking at the drawing , it must just be a Potentiometer .

 on: March 23, 2019, 01:44:02 AM 
Started by mtf_eng - Last post by spit051261
I would start the bike up , put your hazards on and wiggle all the cables under the pillion seat .Could be a dodgy connection .Also wiggle the cables when the brakes are on.
Intermittent faults can be a bugger to find .
Good luck :)
You may need to keep a stash of spare fuses or even replace the Hyosung fuse holder to a blade inline fuse holder so it's easier to get spares until you find the fault.

 on: March 22, 2019, 05:19:25 PM 
Started by blekfleg - Last post by xuraax
Here is another mystery for me.

While all the various manuals for the GT250 speak about 2 IAP sensors, I could only find one.  Since I could not believe my eyes I decided to trace all the cables going to the sensors on both cylinders. Here is what I found:

Cylinder 1
TP Sensor.        Wires are: Orange/Black, Blue/Yellow, Green/Purple
Fuel Injector.      Wires are: Yellow/Green, Yellow/Red
Temp Sensor.     Wires are: Green/Purple, Green

Cylinder 2

IAP Sensor .       Wires are: Black/Blue, Green/Purple, Orange/Black
Fuel Injector.       Wires are: Red/Black, Yellow/Green

I am quite sure of the colours except perhaps for the tracer colours which due to the artificial light inside my garage and also due to the fact that they are thin, they may have a slightly different hue.

From what I have read about the function of the IAP sensors, I must confess I am now completely confused on how this EFI system works.

 on: March 22, 2019, 05:05:28 PM 
Started by blekfleg - Last post by blekfleg
Hello everyone, i have swapped the front and the rear injectors and after them the ignition coils, and the problem does not move from the front cylinder. Do you maybe have any other suggestions regarding what the problem could be with the front cylinder?

Thank you!!!

 on: March 22, 2019, 02:14:23 PM 
Started by blekfleg - Last post by 2turbos

 on: March 22, 2019, 12:56:07 PM 
Started by blekfleg - Last post by xuraax
ok thanks.

I will investigate those points.
Incidentally when I looked up the MAP sensor in the workshop manual I could not find it. However I did find the IAP sensors which seem to carry out the same function. Is this correct?

 on: March 22, 2019, 11:24:02 AM 
Started by Lassen88 - Last post by 1st.turbogv650
An easy check of the o2, disconnect it. It will run open loop, if it runs that's your problem. Will show a fault though.
IAC easy check, either disconnect the two rubber hoses ( either end ). Or start the bike and rev to 2000rpm plus. If it runs that's your problem.

If neither help, you have a different problem obviously.

 on: March 22, 2019, 11:16:35 AM 
Started by Lassen88 - Last post by 1st.turbogv650
The o2 sensor could be reading slightly off. Ecu compensates and runs too rich or lean and stalls.
Idle Air Control Valve controls air flow to the throttle bodies while at idle and the butterflies are closed. They are small rubber hose coming off the bottom of each throttle body joining to the iac valve, with a larger rubber hose then going to the airbox. Located behind rhs air ducting.

 on: March 22, 2019, 10:28:49 AM 
Started by Lassen88 - Last post by Lassen88
Thanks for the answer :) ,

Well if it was the o2 sensor would'nt it be shown in the display as a fault? , and what is the IAC valve? and how to check it :) !

Thank you

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