Hello, I recently purchased a 2010 H3t Alpha. It has an engine code of U0109, no communication with FSCM. The truck starts and runs fine, but someone messed with the wiring going into the FSCM. I'm assume at some point they tried to bypass a failing FSCM??? I'm looking for a wire diagram or if someone can take a picture of the wires as they come out of the harness. The Brown/white wire and solid brown wire were clearly messed with as you can see after removing electric tape they are just twisted together. There is also another brown/white wire not connected to anything and no other loose wire it could possibly connect too. Should it tie into the other brown/white wire????
Thanks for any help.
Dustin

H3t FSCM

H3t FSCM

 

You can also see there was "potentially" a wire/pin removed. But again there are no other loose wires from the chassis.

 

Got it figured out. I was missing a tan wire on terminal 6 that ties into the loose tan/white wire thru a data link resistor

 

Applause and salutations. Nice job on tracking that down.

 

was it critters or previous owner damage?

 

I have a similar issue where the fuel pump is good and they replaced the fuel control module, but the pump won’t run. It seems like the fmc isn’t getting the message to run the pump. I don’t want to keep paying someone else to figure it out. A pin out would help me track down the issue. I
on a related note, I’m looking for a scanner to be able to troubleshoot stuff like this. Suggestions?

 

Any Bi-Directional full function scanner would do it.

I have had this in my Amazon Cart waiting for Mr. Green from the Cabbage farm and Cash Orchard to arrive... they are $30-40 less on ebay. If it is important, for a few buck more you can get the BlueTooth version to use without a cable.

You can skip the bidirectional stuff if you only want to read/scan and go with less expensive versions, but you will kick yourself later when you need that to send a command to test functions.

Have you tested voltage at the fuel pump?

 

Thanks, Doc Olds- I'll get that scanner!
I have not verified the voltage at the fuel pump, the truck sat all winter and the battery needed a charge. There was extensive corrosion on the fuse box, Ive been working on that.
I did find a pin out for the FSCM.
I'm assuming I'm looking for +12V on pin 32 (Battery Positive Voltage out from the FSCM)