Codes P0351 and P0354

Hello,

Here is a guide to help you test he wiring with the engine wiring diagrams in the images below:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the diagrams (below). Please let us know what you find.

Here is a pinout for connector c175e, the center one on your PCM. Let us know if you need anything else.

Thanks for info. It started out ignition coil on cylinder 1 so I switched it with number 4 didn’t fix. Can unplug coil on 1 and 4 while running no difference in engine. So today I take number 4 coil out of cylinder plugged it in held a grounded wire next to it to see if firing no fire. So I plug same coil in to number 5 plug did same thing it’s firing(coil working). Now when I unplug cylinder 1 and 4 and 5 while engine running no difference. So my question is, even though I saw coil working do you think that coil could be bad causing it burn my computer each time? Same coil on all 3 cylinder has caused them to quit working. Thinking about sending computer out tomorrow to have checked.

I would replace the coils that are in question, no doubt! The problem is that the transistor inside of the PCM goes bad and fires the coil constantly until it burns the coil out. Here is a picture of a damaged coil when the PCM goes bad all the way.

Sent PCM out today.

Coil looks good, but when I tested trigger wire yesterday it had a ground all the time though.

How exactly did you test it?

Was the wiring harness connected to the PCM still when you did the testing?

Yes plugged in. At connector I put paper clip each one with multi meter hooked to it. Shows be a ground on trigger wire all the time (key off or on).

Visually the coil in question looks good when I measure ohms on it, it is 1.0.

Yeah that circuit should be open, so your PCM is faulty. The people you sent it to should be able to identify the faulty transistors and replace them.

Circuit board medics fixed computer ($199.00) eBay Motorcraft coils and plugs $197.00 but it’s fixed. Now if I can figure out what’s wrong with my other car all will be good.

Yes! Good job! We can help with anything else you got.