Checking coil drivers on a 2000 ka wasted spark system

Ask for and share advice on using the PicoScope kit to fix vehicles here.
Post Reply
Columbus
OneWave
OneWave
Posts: 18
Joined: Wed Jun 13, 2012 4:03 pm

Checking coil drivers on a 2000 ka wasted spark system

Post by Columbus »

Been playing with a KA this morning which won't start no spark on 1 and 4 checked the wiring back to ecu and its good so i need to check the coil drivers. Live to coil is good.
Having very little experience with my pico i don't want to damage a the car or b the scope so need a little help with connection.
If scoping at the ecu terminals for the negative switching on the coil do i need an attenuator?
Should i expect a primary wave form?
thanks

User avatar
Robski
Advanced User
Advanced User
Posts: 598
Joined: Tue Sep 14, 2010 6:36 pm
Location: Yorkshire

Re: Checking coil drivers on a 2000 ka wasted spark system

Post by Robski »

If scoping at the ecu terminals for the negative switching on the coil do i need an attenuator?
Yes, why ECU terminals, surely you would want the coil end ?
Should i expect a primary wave form?
Yes.

Columbus
OneWave
OneWave
Posts: 18
Joined: Wed Jun 13, 2012 4:03 pm

Re: Checking coil drivers on a 2000 ka wasted spark system

Post by Columbus »

ecu end as its easier to get too
and its the ecu that does the switching which is what i want to see.
Pretty sure the ecu is fudged anyway as i have no spark on 1+4 and spark drops out on 2+3.

User avatar
Robski
Advanced User
Advanced User
Posts: 598
Joined: Tue Sep 14, 2010 6:36 pm
Location: Yorkshire

Re: Checking coil drivers on a 2000 ka wasted spark system

Post by Robski »

Columbus wrote:ecu end as its easier to get too
and its the ecu that does the switching which is what i want to see.
Pretty sure the ecu is fudged anyway as i have no spark on 1+4 and spark drops out on 2+3.
I am well aware the PCM controls the coil, if you have volt drop between there & the coil you won't see it scoping at the PCM will you & then you would scope both ends !

Scoping at which end depends on inputs/outputs, you're obviously not aware of that ??

PS you're welcome ;)

KimAndersen
TwoWaves
TwoWaves
Posts: 246
Joined: Fri Nov 30, 2012 2:53 pm
Location: Denmark

Re: Checking coil drivers on a 2000 ka wasted spark system

Post by KimAndersen »

Hi,

Did you check the wire from the ignition coil and back to the PCM with a DMM and if it's the case, what readings do you get ?

I would suggest, that you make a resistance test from the fuse through the ignition coil and back to the PCM, just to rule out any parasitic drains to ground or any open circuit.


Regards
Kim

Post Reply