96 No Start, Backwards Jumper Cables

[justincollier]

So I was helping my Dad fix his Honda Accord this afternoon. It sat for a few weeks, and needed a jump. As I went inside to wash, he hooked up the cables. Well he hooked up my truck first, correctly. Unfortunately, he got the cables backwards on the Honda. I got back just in time to see the spark. I was doing some other things on the Honda, and tried to start my truck about 2 hours later and no start. Just a click when you turn the key to the start position.

Here is what I have done.
1. Checked the batteries. 818 cca for one, 823 cca for the second, on an 850 cca rating.
2. Cleaned the terminals and posts. Used the wire brush cleaning tools to clean both.
3. Checked fuses under the hood behind the air cleaner box and driver's side under the dash. None blown.

I also noticed that when key is turned to the ON position before starting, the speedometer needle moves up from the stopper peg. When you try to start the truck, the needle moves back to the stopper peg. I don't know if this is normal or not. I never paid attention.

Any help in terms of direction on what to try next would be extremely helpful. I guess it could be coincidence, but it certainly doesn't seem like it.

[JSchuricht]

Plug in a Auto Enginuity or other favorite scan tool ans see if the computer is still working. Could have vary easily fried the ECU and many other electronics.

[justincollier]

Will do tomorrow. Thanks.

[justincollier]

Just finished running the OBD II scan. Here are the results:

Check Engine Light (MIL) is on.

There are no codes

0 of 0 readiness monitors are complete

When I press the CLEAR button I receive the following:

Clear Failed

Unable to clear the data in the vehicle.

Please verify that the key is ON and the cable is connected between the tool and the vehicle.

The key is in the ON position and the cables are connected between the tool and vehicle. I also noticed that the Check Engine Light is NOT illuminated on the dash. When the key is turned to the ON position, it flashes and goes out.

[powerhoghp]

I would say your PCM is well toasted on both sides.....

[justincollier]

Anyway to troubleshoot the PCM?

[justincollier]

I have a couple of additional questions:
1. Where is the ECM located on a 1996 F250?
2. What is the interchangeability on them? Ex. My truck is a 96 4X4, 5 speed. Could I use one from say a 97 2WD Automatic or would the ECM have to be reprogrammed?
3. What/Who is a good source for purchase on ECM’s, besides the stealership?

Thanks.

[justincollier]

It was the starter.