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The invoice has it as “194-6722 SENSOR GP-PR” And they charged $218.85 for it. My truck is a 3126B, I didn’t research if the C7 will need it or maybe already has it. https://parts.cat.com/en/catcorp/194-6722

So to close the loop on this thread. First, on the subject of performing the flash from the in-vehicle harness. I had originally used a wireless adapter (WDS-D) which is essentially a Wireless J1939 adapter. This unit was unable to flash the ECM and after bombing out, left the ECM in a "Blank...

Like I said, I was trying to keep the pictures small. The full schematic is available for download if someone wants it, as you can see from the snip, Clutch is wired to PTO input further down the harness. ECM must use the clutch input for some part of its PTO programming.

What Cat Lists for those pins matches what the S&S schematic says. Which pin number were you suspecting was wired to +12 because I don't see any other pins wired to power in the schematic, they are all inputs and outputs.

I just snipped out the connector part of the schematic to keep the picture small, but if you trace those all the way out they all end up at either +24 BATT or +24 Ignition(via circuit breakers). I will also use a volt meter at the truck connecter when I disconnect it for the bench flash just to...

Just circling back on this point, according to the A1 schematic, the ECM is fed with 24v. I am assuming you were successful doing it with 12v and that is what I will try first, but this is interesting.

yeah seriously…. Just an update, because I didn’t follow advice from @fuzzytoaster my truck is out of commission until a bench flashing harness arrives from Australia. Trying to flash the ECM through the vehicle harness is a BAD IDEA. ECM thinks it is blank and of-course I am now crank no-start...

I believe that I successfully backed all of that up before the flash attempt. Did you remove your ECM from the truck when you used the 70pin cable? To confirm what you said above, the ECM needs 12V? not 24?

I figured I'd give it a shot and SURE ENOUGH, exactly what you said would happen, happened. Imangine that. Now CAT ET basically believes the ECM is blank, however it won't even try to flash now, it bombs out with an error code 98304 "The ECM is not responding to the service tool" Once I have...

This is great info, I was playing around in ET and it mentioned taking an "ECU Replacement" file. Now that makes sense based on what you are saying, I will be sure to pull that immediately just so I have it on hand in-case my ECU ever croaks.

This was the "Gotcha" I was afraid of. So there is no way to flash via the kick panel? Can you provide some information on the 70 pin cable? Is it easily available? Do you want to sell yours? Thanks for the info!

I would like to get a little more juice out of my engine while climbing grades. Is it really as simple as flashing the ECU with a 5 Ton flash file? I have seen a few threads where people have mentioned having that done in concert with a gear change, but I haven’t found it explicitly stated and I...