Medium and Heavy Trucks
Have Truck Repair Questions? Ask an Expert
Thanks for asking your question. I will try and help you out.
Yes when a flash the flash process does not complete and errors. ET will not communicate. But winflash should. If winflash does not. I would first want to use a bypass harness and connect directly to the ECM. This will eliminate any type of wiring problem. If you are still having trouble I would try different Comm adapter cables. I have seen them go bad while using et.
If you are still having problems I must suspect the ECM is faulty. It is very rare for an ECM to fail during flash but I have seen it a few times.
Please reply back if you need more help or have more questions. I am happy to assist.
Thanks for the information.
So you wired directly to the ECM and it did not communicate?