I have a '93 that has no spark at the coil. I've replaced the coil, ICM, Opti, and plug wires. I've been searching this site for clues for days. Nearly every thread eventually ends up with a link to Shoebox's "OPTI and Spark Test"http://shbox.com/1/4th_gen_tech2.html#opti_test

Question #1 - How does this diagram differ on '93 model cars? I know my coil connectors are different, but I don't know how that comes into play.

Question #2 - I am also having a hard time digesting the test procedures. It says "Check for dc voltage with a digital meter at harness terminal "A" to ground and also "D" to ground."......there are 3 harness terminal A in the chart. Which one are we talking about?

Question #3 - It says "use the diagram and chase back toward the coil and the ignition fuse"....back from where? Where are I starting at?

I know I am making this harder than it is and am just misinterpreting it somehow......please clarify!!

 

As far as the changes in year, I am not sure. But the terminals used in the tests are the ones on the pigtail that plugs into the icm. It should be labeled.

 

1) http://shbox.com/1/93_ign_system_schematic.jpg

2) Follow the text. Before that statement it says to disconnect the ICM connector. That is the harness connector you are working with.

3) Again, following the text, it is referring from the ICM harness connector.