I did do those tests and isolated it is not the PCM. I just didnt post it. The ICM seems to be testing properly too.

 

So the Shoebox tests showed you that the Opti pulse signals were reaching the ICM???? Even though the Opti appears to be seriously damaged???

Did you check all the Opti harness connections, as I suggested in post #2? Surely that would have alerted you to the problem with the fire damage. Something just doesn't add up in this thread.

 

The fact that I dont post absolutely every step might be why you are confused. I could not test the pulses because It would not start. I did the test below because its all I could do. ICM Harness

A = ~10vdc-12vdc (or your system voltage)
B = 1vac-4vac while cranking
C = ~ 0 ohms to ground with key OFF
D = ~10vdc-12vdc (or your system voltage-might be slightly less than reading at "A")


At the end of the optispark harness (disconnected from the opti) with the key ON, you should see:

Optispark Harness

A = ~5vdc
B = ~5vdc
C = ~12vdc (or your system voltage)
D = ~0 - 0.2 ohms ground with key OFF

I also tested the ICM in this method.



You don't need a whole lot of stuff, heck, you don't even need a scan tool (tho' a scan tool is important to have, but not for this article)! Here is what you're gonna' need to effectively use the information in this article:

1. A multimeter (don't have a digital multimeter? Need to buy one? Click here to see my recommendations: Buying A Digital Multimeter For Automotive Diagnostic Testing).
2. An LED light. To see a photo of this tool click here: Abe's LED Light.
3. A 12 Volt test light.
4. A helper to crank the engine.

It passed.

Long of short, The Opti IS bad and being replaced.

 

Apparently you don’t understand the purpose of the first test. IT IS A TEST FOR THE PULSES REQUIRED FOR THE COIL TO PRODUCE A SPARK. If you measured the voltage on pin “B” and it was not in the range of “1vac-4vac while cranking”, you were not getting the pulse. That is a fairly significant result, and should have been communicated. But I guess that was too much to ask, and you went off on the fuel system.

Good luck.

 

Maybe you didn’t understand. This car had multiple failures in a very short amount of time. Fuel pressure regulator was the start. I wasn’t just asking about the Opti. From the codes and testing I was damn sure it was intermittently failing to give signal. I was asking how a regulator could have caused cascading failure of multiple systems which didn’t compute in my little brain. Now that I have seen evidence of a fire, it explains why so many systems took a dump at the same time.