We have received feedback from customers reporting that the ECU becomes “bricked” when attempting to read from or write to a Hyundai/Kia MEDG17.9.8 unit using the CG FC200 ecu programmer.
When using the FC200 device on this Hyundai ECU model MEG17.9.8, the bricking issue is actually caused by interference from the transmission (TCU) chip.
The CPU architecture features shared ECU + TCU communication. When reading the engine, it is susceptible to interference from the transmission TCU chip, causing password data to conflict and sending the ECU into a pseudo-dead (bricked) state.
There are two solutions:
Option 1: Solder a 1000-ohm resistor at a specific location to eliminate the interference (check images below).
Option 2: Open the ECU shell to avoid the interference.
The most reliable method is to open the cover and remove the crystal oscillator next to the TCU chip to prevent interference. This will create a single channel and prevent the transmission from interfering with the CPU.
Then start read and write this ECU with FC200 on bench mode.
