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Author Topic: Intro to diagnostics  (Read 3154 times)

Joseph Davis

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Intro to diagnostics
« on: October 28, 2011, 01:25:34 PM »
The site is there to sell you something, and looks like an ad-infested shithole designed in 1997, but the tech articles it directs you to via the hyperlinks on the right hand side are really quite good.

http://www.diycardoctor.com/

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mrgreengenes

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Re: Intro to diagnostics
« Reply #1 on: October 29, 2011, 12:17:58 AM »
needed:  1 oscilloscope... could have used it a couple times this week.  good info on electrical diagnosis.
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t_cel_t

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Re: Intro to diagnostics
« Reply #2 on: October 29, 2011, 02:38:33 AM »
cool stuff
i actually just got a scope like a week ago and immediatly ran outside and started scopeing shit on the car. i did have trouble getting it to trigger on the coil fireing(single coil) and it had a lot of shit added on(maybe interference from the coil fireing and current reversing?). know how i could clean it up?
the MS does give a perfectly square wave to the bosch igniter.
cant wait till i get another probe.

neg side of the coil



and the output from the ms

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malone labe

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Joseph Davis

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Re: Intro to diagnostics
« Reply #3 on: October 29, 2011, 02:42:56 AM »
Yeah, the spike is flyback.  It's a no-no to scope the coil if you don't have a HV probe meant to deal with that sort of thing, you might wipe out the scope.
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t_cel_t

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Re: Intro to diagnostics
« Reply #4 on: October 29, 2011, 03:10:05 AM »
even if its just the primary side of the coil?, probe is an older tek that says 1kV rating.
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malone labe

I think all cop cars need to have turbo. nbspnbsp Then they would understand the necessity of putting your foot down and how uncontrollable the urge is to fucking rail on that shit.

Joseph Davis

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Re: Intro to diagnostics
« Reply #5 on: October 29, 2011, 08:02:45 AM »
Flyback happens on the primary, too, which is why the ECU uses an ignitor to switch the coil. 1kV should be fine, tho... IIRC you get ~600v flyback on the primary?
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