Quote:
Originally Posted by ChevyTech
The pickup coil connects to the distributor module not to the ECM.
The reference pulse comes from the module.
It is also possible for the distributor module to produce spark without sending a reference pulse to the ECM but this is rare.
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I looked up a diagram. I see it now. You are correct.
On most of the cases I have seen first hand, when there is no spark and the is injector pulse, the module has failed. Or when there is no spark and there is no injector pulse, the pick up failed(mostly due to a worn distributor).