i made an error: measuring voltage with amperometer

aster94 · Dec 24, 2016

i think that stupid errors are the worste one....

yesterday i was doing a little bit of maintenance to the bike (gsx-r 600 l1), i wanted to check the voltage of the battery but i was in the wrong mode with the multimeter. i didn t notice that i was using the amperometer, after 5-6 seconds of contact i start seeing smoke from i don't know where (somewhere under the fuel tank)

i disconnected the battery and stopped everything, today i tried to turn it on. and surprise... i hear strange continous noise from the throttle body and the bike doesn't want to turn it on...

another ticking noise came from the "omron G8MS-S23 12V 21X0D5" on the right under the driver seat, but really i don't know what it is. i checked all the fuses and they are ok. I have another ECU and i tried to use it but nothing changed

this is my christmass present :facepalm

TheGeek · Dec 24, 2016

So you hooked an amperage meter across the battery terminals? That should have only damaged the battery. I'm not sure how shorting the battery would have damaged the ECU or relays.

dpapavas · Dec 24, 2016

+1 to what TheGeek says, assuming you did probe the battery poles. Did you perhaps try to read the battery voltage somewhere else?

aster94 · Dec 24, 2016

yes i probed the two battery poles
i really really hope that i broke only the battery but i don't think it
i tested the battery (this time i used the correct mode with the multimeter) and it show 11.5 so i think it is ok

. I'm not sure how shorting the battery would have damaged the ECU or relays.

any idea how to check it? which one should i check?

dpapavas · Dec 24, 2016

aster94 said:
i tested the battery (this time i used the correct mode with the multimeter) and it show 11.5 so i think it is ok

11.5V is pretty much dead for a lead-acid battery. Such a low voltage is quite likely to be causing your current trouble. Try charging the battery externally and see if it's got any life left.

The smoke from the tank is still puzzling though. Any chance your DMM was resting on the tank when you were measuring the battery?

aster94 · Dec 24, 2016

i thought that 11.5 if the engine was off was ok. i m putting it under charge right now.
about the smoke it didn't came from the DMM, but i don't know from where

(to be honest i think that it come from a wiring where there are a lot of copper ground tied together but i can't be sure, i m not able to post immage now but i will do it)
about the omron G8MS-S23 12V 21X0D5, is it the fuel relay? why there are two?

motomedic321 · Dec 24, 2016

Smoke from under tank wouldnt have anything to do with components under the seat.
U would have seen where the smoke was coming from were the affected component under the seat.
Fuel pump would (should) hum at key on.
STV would cycle at key on and might click if drive gear were damaged and motor could smoke if overworked.
I think you would likely cook the multi-meter if u checked amps across terminals. At those two points u would be measuring FULL CCA of battery. Without an amps shunt u basically are preparing to make toast.
Checking amps at power off between a battery terminal and a battery pole (post) is a different story.
Same thing applies at key on between terminal and pole (post).
How and where exactly did u have the meter set up to check for amps (current)?

aster94 · Dec 24, 2016

motomedic my wish isn't to measure the amps of the battery i just made an error while i was measuring the voltage
i m quite sure that the smoke didn't came from under the seat but i don't exclude what you said

about the relays under the seat, i have three: one of the lights with 7 pin and it looks working. than i have two identical relays with 4 pin, according to the drawing of the bike one is for the fan the other for the fuel pump, i don 't know how to recognize them. the relay that make the ticking noise is located nearer to the battery
it is identic to this (do you think that is good or is better to buy a OEM?):
it.aliexpress.com/item/4-PIN-Motocycle-Starter-Relay-Solenoid-For-SUZUKI-LT80-QuadSport-80-2X4-1987-2006/32774156040.html?spm=2114.010208.8.41.Um0kmx
add "https://" at the beginning to see it
i m not sure but i think at key on i didn't hear no sound from the fuel pump nor from the STV

now i am waiting for the battery to be full charge then i will try only to turn the key on
do you suggest any test to check them while i wait?

aster94 · Dec 25, 2016

hello!

so the battery looks good, charget and now it s at 12.5

i made a video while i turn the key on

what do you think? do you suggest any test?

TheGeek · Dec 25, 2016

Not sure about the L1, but at prestart I think they're supposed to go open and stay open. What's it do now when you try to start it?

aster94 · Dec 25, 2016

To be honest i didn t tried because i had fear of making damage...
Before turn the engine on i would like to fix the prestart problems

dpapavas · Dec 25, 2016

Well,do you notice anything unusual now the battery is charged? Though 12.5V after taking it off the charger doesn't sound too good. What kind of charging voltage are you getting at idle and at 5000rpm?

aster94 · Dec 25, 2016

I didn t turned it on yet, when i do it i ll tell you
But don t you think that during the prestart there is a sound missing? No fi error anyway

dpapavas · Dec 26, 2016

aster94 said:
But don t you think that during the prestart there is a sound missing? No fi error anyway

Hard to tell. The STVA obviously works and can be heard. Perhaps the fuel pump priming sound is missing, but if that was the case, you would be getting a code.

TheGeek · Dec 26, 2016

I'm curious if the mistake damaged the ECU. On the earlier bikes, the STVA controls fast idle and goes full open. On the newer bikes with the ISC system, this isn't necessary, so the SDTV system may be working fine. It certainly sounds fine. If it wasn't supposed to return closed, it should code if the ECU is healthy. To many uncertainties for me to tell.

Fire it up, you won't hurt anything.

aster94 · Dec 26, 2016

10 minutes ago i turned the key, i heard all the sound of the prestart so i turned the engine on and everythings was ok
I just disconnected and reconnected, again, the ecu, battery and some relays, nothing more

I think that R2-D2 tonight come in my garage, i don't have any other logical explanation for this

anyway thanks to all of you for helping me! :grin2:

P.S: @TheGeek from your signature i would say that you are an electronic engeeneer or programmer. have you ever tried to use the k-line? i saw that a lot of people with kawasaki did it!

motomedic321 · Dec 26, 2016

Fuel pump relay is nearer to battery. And if u wanted to check for a bad fuel relay u can swap the relays (fuel pump for cooling fan)one for the other.
Fuel pump SHOULD run when key is on AND kill switch is in run position.
If the pump does not 'hum' and u do not get an FI indication then the pump motor is probably bad or the ECM isnt functioning.
Does the instrument cluster LED read 'CHEC' when you turn key on?
I understand your concern after seeing smoke and especially now if the fuel pump isn't operating.
There are in fact checks u can do but would be rather lengthy to type out here.
You need a service manual for your machine.
And I agree with Geek about attempting to start your machine. If anything it will work fine and the smoke was an apparition OR it won't work and the FI system should send you in some sort of diagnostic direction.

motomedic321 · Dec 26, 2016

nevermind then.

aster94 · Dec 27, 2016

Thanks the same, before i was wondering if i could swap the two relays and now i know that in the future i could do it

i made an error: measuring voltage with amperometer

aster94

TheGeek

dpapavas

aster94

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aster94

motomedic321

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aster94

TheGeek

aster94

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