Will Not Start

[sttstroke]

Well the other day I was driving and my truck started to miss, so I took my chip out and it was fine. So I figured bad connection. So today I cleaned my my chip and put it back in and it will not start. So I take it back out and still will not start. Cranks fine just seems like out of fuel. I have unhooked the battery cables and hoped that would work but nothing. So I still have a superchips programmer that I use for situations like this. I hooked it up to read the codes and it says communications error. So I tried to program it and it wont even save my stock program. One thing I did notice is when you turn the key on it doesnt say wait to start. and it always says that even in middle of summer. Any ideas would help thanks

[bigcountrysg]

Did you disconnect the batteries when you removed the chip and then when you reinstalled it. If not then most likely you fried the PCM. Which when you hook a scanner to it. It will say Communication Error.

[Southpaw]

No wts light in the obs meant maxifuse #22 blew under the hood(fuel bowl heater). I don't have a fuse box under the hood on my 02, does your 99.5? Just a thought/place to start. Maybe find the mini fuse in the truck that controlls the wts light, and see what else is on that circuit?
Other than that, you could try your spare cps, see if that helps?
Hopfully someone with more help will be along.
Good Luck

[sttstroke]

It ran fine after i took the chip out the first time then yes I unhooked them when i reinstalled it. How would I know if the computer is bad?

[Southpaw]

Bigcountry beat me to it.

I didn't know that about the batteries either. Good to know now since I am planning on getting a chip soon!

[Southpaw]

Is there a code given when it says comm. error, or it won't even talk to the truck at all?

[sttstroke]

Honestly I never even checked the fuses, I have to wait till the morning my truck as at my dads an hour away.

[bigcountrysg]

Originally Posted by Southpaw

Bigcountry beat me to it.

I didn't know that about the batteries either. Good to know now since I am planning on getting a chip soon!

It is in the instructions I got when I bought my chip. It said warning disconnect batteries prior to removing PCM or installing the chip. Failure to do so could result in damage to the PCM.

The wording was more technical but basically that is what it said.

Well if you disconnected the batteries. Then I would go with southpaws suggestion looking for blown fuzes. Also check the glowplug relay.

[Southpaw]

Is there a test you can do yourself to check the PCM? When this happened to my obs truck, everyone told me the pcm was fried, but I had no idea how to test it to see for sure? It ended up being the fuse for the fuel bowl heater. I'm glad I didn't have to replace it before I figured it out, but it would be nice to know how to test it.

[sttstroke]

If its my computer can I tell by looking at it