Checking coil drivers on a 2000 ka wasted spark system

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Checking coil drivers on a 2000 ka wasted spark system

Postby Columbus » Mon Sep 16, 2013 12:44 pm

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

Postby Robski » Mon Sep 16, 2013 4:26 pm

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

Postby Columbus » Mon Sep 16, 2013 5:52 pm

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

Postby Robski » Mon Sep 16, 2013 6:14 pm

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

Postby KimAndersen » Mon Sep 16, 2013 8:28 pm

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.


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Kim
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