Scanner Connection Issue

Marty · Apr 4, 2012

Scanner won't connect, truck is not starting.

2000 F450, harness was eaten up at several plugs and not making connection. 42 pin connector was stripped so I replaced engine harness from a 2000, replaced chassis harness from Late 99. Both were in working order prior to install.

It's not a bad pcm or IDM. Both were swapped with same issue.

It's not a bad ground, the truck started and ran prior to this just missed on cyl7. Everything is right (keys, modules, etc.) on scantool. Scan tool will work on truck right next to it.

No blown fuses. PCM is installed correctly.

No wts light, fuel pump does not kick on with key forward. It seems like a PCM issue but it's not. Truck is bone stock, no chip.

Thoughts?

bad12jr · Apr 4, 2012

Different pin out from the 99 chassis harness to the 2000 engines harness?

Sent from my DROID X2 chillin somewhere

Marty · Apr 4, 2012

Pcm is same and interchangeable from 99-2000.

BigAlsPSD · Apr 5, 2012

Does the OBDII port have power?

Marty · Apr 5, 2012

Top left ground doesn't work on a couple of trucks here.
Bottom left doesn't see ground with key off on either truck.

Layson · Apr 5, 2012

Just throwing this out there. Have you tried your AE on another truck recently? I had one of the pins in my AE plug push back into the plug. Sometimes it worked, othertimes it didn't... ??

Dave · Apr 5, 2012

OBD II port have power in the 450 Marty. Looks like you eliminated all other possibilities?

Marty · Apr 5, 2012

I'm using a snap on scanner. I connected to three other trucks today. Its not a scanner issue. its an issue in the wiring in this truck.

JLDickmon · Apr 5, 2012

does the OBD connector have power?

Marty · Apr 6, 2012

JLDickmon said:
does the OBD connector have power?

Marty said:
Top left ground doesn't work on a couple of trucks here.
Bottom left doesn't see ground with key off on either truck.

View attachment 5306

See above.

JLDickmon · Apr 6, 2012

it's either got a #30 fuse in the dash smoked, or the PCM grenaded when it was swapped..

Marty · Apr 7, 2012

All fuses are working.

PCM is fine, works in my truck and my PCM doesn't work in this one.

I guess I need to find a PCM pin-out. There must be wiring issue.

JLDickmon · Apr 7, 2012

Marty said:
All fuses are working.

PCM is fine, works in my truck and my PCM doesn't work in this one.

I guess I need to find a PCM pin-out. There must be wiring issue.

it's in there somewhere..

907DAVE · Apr 7, 2012

PM sent.

Marty · Apr 11, 2012

PCM wasn't getting a ground.

Removed and cleaned 2 grounds and everything works perfectly.

TARM · Apr 16, 2012

I was about to post you need to get the multimeter out and check ground at the PCM then I read your final post LOL.

On a different note speaking with the tech at AE ( i know you are not using this one) there module requires the power from the ODBII port. If you do not have power at that last pin out then AE will not work.