Holy crap. No claim to anything here. I'd never have considered that, and will probably never have the opportunity again lol.

The thing about electricity is while it's true it takes the path of least resistance, that path is always all paths simultaneously in proportion to their resistance. So yeah that zap was grounding through the sensors to the computer. Sounds like only enough for the software to have an unhanded exception vs causing physical damage.

Congrats on your persistence to resolution.

 

Glad you found the issue also! ..... but a couple of "lingering" questions -

I believe Ed suggested you ohm out the injectors also, Didn't re-read to see if you did though.

Also, what happened w/ the 8 glow plug codes?

 

[QUOTE=chad419;18476430 ..... I checked the solenoids all of the injectors a while back and they all ohm'ed out within spec pin to pin. ....... [/QUOTE]

I think he did.

 

I did ohm them out, and that's the suprising part, there was no short or open coils. I made a test plug with two ohm meters and a female connector from an old ficm harness so I could test them in place.

I still have not fixed or even looked at the glow plugs. Will address that tonight.

 

I did do the buzz or individual click test using forscan and it would intermittently cause a no click on #1 but not always. I think it has to do with the frequency or position of the rocker arms next to the solenoid.

 

hey, I have a 2003 literally doing the same, thing as originally posted. owner installed a new FICM thinking that was his problem. when it was towed into my shop, it was showing codes for high voltage on cylinder 1 and 4, and low voltage for 6. once reading through this post, I started un plugging injectors individually. once I unplugged #6 the PCM didn't keep resetting its self. truck starts normal. going to install a new injector tomorrow. one thing I did notice is that the PCM stops resetting its self once the injector buzzing was done. My Snap-on Apollo wouldn't let me do a buzz test, it kept saying communication error.