Ignition system question
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- chief eaglebear
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- chief eaglebear
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The direct ignition (DIS) system is responsible for producing and controlling a high energy secondary spark. This spark is used to ignite the compressed air/fuel mixture at precisely the correct time. This provides optimal performance, fuel economy, and control of exhaust emissions. This ignition system uses one coil for each pair of cylinders. Each pair of cylinders that are at top dead center (TDC) at the same time are known as companion cylinders. The cylinder that is at TDC of the compression stroke is called the event cylinder. The cylinder that is at TDC of the exhaust stroke is called the waste cylinder. When the coil is triggered both companion cylinder spark plugs fire at the same time, completing a series circuit. Because the lower pressure inside the waste cylinder offers very little resistance, the event cylinder uses most of the available voltage to produce a very high energy spark. This is known as waste spark ignition.
Pins 1 and pins 33 say IC control coils 1&4. Also 2 pins for coil control 2&4. Why two control wires for each coil? Can someone please explain. Thanks again.
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- juergen.scholl
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One wire may well be the signal wire to make the coil fire and the other may be a feedback signal telling the ecm wether the coil fired or not.
I you had a scope you coul look at both signals to confirm wether they carry different information.
Yoy might want to look at operating principles in Alldata as well.
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- Andy.MacFadyen
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It is a wasted spark design but different from the normal shared coil. On this design the ignition amplifier module is built into the cassette with the coils.
The ignition amplifier module has two channels for cylinders 1&4 and 2&3
ISTR The inputs to to the amplifier terminals are in order . (1) 5v square wave, (2) 12v Power (3) 5v square wave,
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- Andy.MacFadyen
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www.picoauto.com/library/automotive-guid...o-amplifier-signals/
www.picoauto.com/library/case-studies/20...ire-under-load-p0300
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- juergen.scholl
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autojoe wrote: Thanks I will check out. If you look at the pcm diagram I posted it shows two different pins for coils 1&4 control and two different pins for coils 2&3 control.
This is actually not a diagram ,it's a pin chart....
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- Andy.MacFadyen
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- juergen.scholl
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autojoe wrote: The pcm diagram is in a previous post. I know what a diagram is.
I missed the wiring diagram, sorry for that. No offense intended.
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