I confirmed battery voltage as soon as the problem showed up. I have two grounds, one at the base of the ECU (mounting bolt) and the second at the base of the mounting bracket for the ECU (mounting bolt). I assumed that swapping a known good second ECU and finding spark then re-testing the first ECU and finding no spark again was a good test for a bad part.

Note: The second ECU was not mounted. I just moved the harness from the first ECU and plugged it into the second known good ECU. Then I used a wire with two alligator clips to ground the body to the ground wire on the first ECU. This setup showed spark at the coil wire.

What do you suggest I try?


Thanks for the reply.