KYMCO like 200 keeps dying

[Stig / Major Tom]

Is the trigger for the injector 12 or 5 vdc?

It is my understanding also that some of the sensors receive 5V impulses from the ECU.
But 2.5...??
Pretty sketchy/hazardous  way to test ECU/injector cooperation. ...is connected injector into coffee can and hit starter button.
Will see what the mechanic thinks of 2.5

Stig

[whiskers626]

I did the coffee can thing and hit the start button, it did squirt some gas but it was a minute amount, by the time I looked back in the cup it had evaporated.

[CROSSBOLT]

It is my understanding also that some of the sensors receive 5V impulses from the ECU.
But 2.5...??
Pretty sketchy/hazardous  way to test ECU/injector cooperation. ...is connected injector into coffee can and hit starter button.
Will see what the mechanic thinks of 2.5

Stig

Yes, 2.5 volts would be too low regardless. But then that could be a multimeter scan thing.

I think the coffee can idea is good if the starter is allowed to spin the engine 3 to 4 cycles. That way, both spray pattern and cycle to cycle consistency could be observed.

[Stig / Major Tom]

OK, the black&blue wire from the ECU to the injector carries the battery voltage with the key on and should have 11.77>12V .
The white&red wire carries the triggering signal from the ECU.
Try that and see if my info is accurate.
Please be darn certain you have a reliable reading with your multimeter - because DCV 2.5 is a problem on which-ever is the triggering wire.

Now the ECU to injector wire takes a few 90 degree turns - so inspect it closely for any breaks on bare spots. It would not take much for a faulting wire to give the injector bad triggering info. from the ECU.

Let us know what you find out.

Stig

[whiskers626]

Ok I must have been testing wrong, this time I touched the black probe to a ground and the red probe to the connector, can’t tell which is which but one of the connectors I get 11.9 with the switch on and nothing out of the other. Now on the triggering side when I try and start it, it jumps around but never reaches even 1 volt. So not sure what to think,

[Stig / Major Tom]

OK, it looks like your ECU is sending the proper signals to the injector with the key on - no start. (don't worry about what it's doing when starting - the signals from your ECU are too fast for your meter).
11.9 battery voltage with key on is good in the one wire.
"0" DCV on the other is good (it's a ground)


Now the injector needs a test.
Using your multimeter* set to read ohms - measure the resistance between the two injector terminals. You're looking for 11.7 ± 0.6 ?

*If you are a little rusty with this - please watch a youtube.

Stig

[whiskers626]

Ok this is weird, the ohms on this injector kept jumping around anywhere from 32.5 to 145. Even up to 170 something.
Not sure what to make of that

[CROSSBOLT]

Just to eliminate any problems with the meter, what do you get when you touch and hold the meter leads together for 5-to-10 seconds?

[Stig / Major Tom]

It is kind of important that you and your multi meter are doing this test correctly.
Again - if in doubt watch a few youtubes from electrical pros.
You are looking for 11.7? ….+ or - .6?.

check your multimeter as Karl suggested to rule out meter error.

No point in purchasing a new injector if your's is giving the above reading.

Stig

[whiskers626]

When I touch them together I just get 5

[Stig / Major Tom]

I checked two known good LIKE injectors this morning. 12.1 ohms on one and 11.9 ohms on the other (looking for 11.1>12.3 ohms)
Yes, .5 ohms resistance in the meter prongs itself is OK I think.

OK, so back to the test at the injector socket.....still getting crazy readings with meter set to read ohms as in my photo?
Stig

[whiskers626]

Ok finally got a reading and it stopped on 16.4,

Not sure what that means is higher the number better or lower than the norm better?

[Stig / Major Tom]

The reading you provided us here is outside the range as stated in the USA Kymco service manual.
16.4 is not within the manual's specified range of 11.1 to 12.3 ohms.

The USA Kymco service manual states:
"Replace the fuel injector if the reading is beyond specification."

I am not going to say that you need to replace the injector. What I am going to do is re-read these 7 pages associated with your scooter's issue - and see if it makes sense that a sick injector > and a scooter which now runs only, and only briefly, on starter spray are logically connected.

Hopefully, you'll join me in this as well.....and decide what you want to do.
Your injector is likely a Siemens  DEKA model. A stock Kymco part of @$70.
Stig

[CROSSBOLT]

When I touch them together I just get 5

You get 5 (=as in 5.0)? That means your resistance check  of 16.4 ohms is REALLY 11.4 ohms which is in the normal range. You still have a fuel delivery problem.

Causes:
1. System volts below 10.5 when cranking to start.
2. Low fuel pump output/pressure
3. Bad gas or diesel in tank.
4. Too much time on this forum has ruined you!

[scooterfan]

Stupid question: Have you tried a bigger battery since the new starter has been installed ? Like using jumper cables on a loose car battery ?