Truck-97 F250 4x4 ,351, E4od tranny.
Got this truck 2 winters ago to plow. It ran great but had a ticking noise. After snow season I decided to put it on the road. The guy at the inspection station said the ticking was a cracked flexplate but when we put it up on the lift we couldn't find anything wrong with it.
About 20 miles of road driving and bang the truck stalls, it had torn the center out of the flexplate. I replaced the flexplate and all was fine for a few days until the ticking started again. I took it to a friend of mine who does a lot more mechanic work then I. He couldn't figure it out and I didn't even make it home before it took the center out of the new flexplate.
Talked to the local tranny guy and the dealer but nobody could explain what was going on. So this time I replaced the torque convertor with the flexplate, drained fluid and installed new filter.
Truck plowed fine all last winter but started getting a check engine light after it warmed up. Drove it a few miles up and down the road and realized it wasn't starting out in low gear. So I went and got a code reader and it showed a shift solenoid 1 and 2 circuit failure along with a EPC circuit failure.
It seemed a little odd that 3 solenoids would be bad so I checked the wiring and sure enough it had fallen into the front wheel drive axle and the guy had just tied it back up before I bought it.
2 broken wires and 5 with damage. I repaired the harness thinking that my troubles would be over but the truck began to run ruff and shift real hard, although it was starting in low gear now.
I put the code reader back on and got the same codes. I did pull the neg terminal off which should nave cleared the code from before. Here is a list of the codes.
Engine off: 621-shift solenoid 1 circuit failure, 622-shift solenoid 2 circuit failure, 624-EPC circuit failure.
Engine running: 332-insufficient EGR flow, 536-brake on-off circuit failure, 632-overdrive cancel switch, no switch action detected.
A lot of information I know but it all could be important.
Is it likely that the PCM got fried??

 

No, that isn't likely at all. Possible, but not likely.

The 536 and 632 codes mean either you didn't press the brake pedal and the OD OFF button during the test or both of them are bad.

The engine off codes mean you still have wiring issues. All three of those solenoids are on the same power feed. I'll bet they are not getting power.

 

Thanks Mark for taking the time.
Have a cheap actron obd-1 scanner and there wasn't anything in the directions about pressing the brake or OD button. Less worried about those right now anyway.
It shouldn't be to hard to check for power. I'll just put a meter on the connector at the transmission end.
I'm 99% sure of the harness repair so if there is no power I'll recheck fuses. Any chance it could be the PCM relay??

 

If it's the PCM relay the engine won't run.

 

Ok, thanks.
I'll check the power to the tranny and go from there.

 

Ok we're making some progress.
Had power at the connector but after putting it back on the shift solenoid 1 & 2 codes went away, must have been dirty or bad connection. The EPC circuit failure code is still there but I took it for a drive and it shifted smoothly. Also the off light in the OD cancel display stopped flashing.
The check engine light came on after about a 1/4 mile, still a number of codes for that.
311-thermactor air system problem
332-insufficent EGR flow
538-insufficent RPM change
411-can not control RPM during test
The brake on-off and OD cancel switch codes are still there but like you say I may need to operate them during the test, I just don't know when.

 

Press the brake and the OD OFF button anytime during the test.

 

Ok I'll check it out when I get a chance, probably tomorrow.
Thanks again.......

 

Had other things to do for a couple days but was able to fix a few things and recheck yesterday. Had a bad airbox (the one mounted on the passenger side inner fender), replaced that and all the codes except the brake on-off are gone.
The brake is a little soft so there probably is something going on there. For the most part the truck is fixed...........Thanks Mark