Hyundai Gateway Bypass

On some cars - notably the i20N, the gateway blocks all communication on the CAN ID's that the logger requires. Unlocking the SGW does not seem to have an effect and since flash tools do not allow writing the complete content of the CPEGD3 ECU, it is not possible to write a patch. Hence a hardware solution is required.

On all HMC/KMC cars there is a Front Harness to Main Harness connector, that also carries the PCAN.

Location:

Connector schematic:

Connector front photo:

Connector rear photo:

Socket schematic:

Socket photo:

1. Prepare a couple tinned wires or probes and connect Pin 6 (CAN H) and Pin 14 (CAN L) to your J2534 device on the other end (do not connect any other wires):
   
2. Remove cover:
   
3. Insert (and fix with tape or cable tie) wires in rear of EM11 connector. In picture Green is CAN L and White is CAN H:
   
4. Initialize ECU and proceed.