4-7 firing issue; posting for a member

[scottfab]

Originally Posted by XfireZ51

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The DIS should survive firing even a shorted coil because it is "current limited". Obviously the engineers that designed the IM took into account contingencies and malfunctions and safeguarded the IM from them. If all else fails the IM is what provides the "limp home" capability since it is essentially a CO-ECM. That's also what makes it difficult to substitute for without some great expense. Anyway, I bring this up to illustrate the ruggedness of the DIS module. Its probably the last thing to consider when having ignition problems since everything else will fail before the DIS does.
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I wouldn't take this to the bank. It'll bounce.
I have a DIS from Mark H that I've examined in detail.
Any current limiting the DIS has still generates significant
heat which takes out the output FET(s) eventually.
If anyone would care to setup an experiment demonstrating
the DIS working into a dead short I'd be very interested.