Question about 1990 Pontiac Trans Sport
All circuits are linear.
First there is a fuse, then the ignition switch, then the ECU, then the ECU puts out the signal to the coil packs based on input from the sensors.
But you need to check if power ever even gets to the Electronic Control Unit.
There is also a knock sensor.
All car went to electronic ignition, not only to avoid the need to set and replace points all the time, but also because they needed to have electronic control over timing advance and ******, based on things like engine knock, fuel quality, O2 sensor feedback, temperature, etc.
But don't just replace things.
Things like an ECU can be taken in and tested at a place like Autozone.
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
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