VC66 heavy duty model with engine 6WG1-TCG61, already in a more than 90000Km travel distance.
Alarm on the dashboard, unable to connect the OBD.
After using the IDSS KT710 to read the DTC and data stream, all the DFC regeneration and program refresh failed. The primary diagnosis is that the old dashboard system causes the abnormal CAN wire resistance.
U010B02 EGR2EDC (Information frame data timeout)
U010B2B EGR2EDC (Information frame data timeout)
U010C00 VGTStatusRxHW (Information frame data timeout)
The above three items need the CAN wire to communicate, the timeout happens due to the non-detect of the CAN wire, and the dashboard interferes with the CAN wire, so please check the power supply and ground wire if the alarm still exists without the interference.
Disassemble the dashboard, look for the white plug on the left and the two green harnesses on the right.
Cut off the harness, the DTC still exists.
There is no 20V power supply with the EGR joint.
Open up the relay case at the front of the passenger seat; replace the second relay in the first column for the EGR and turbocharger, and the vehicle works well.
Note: The relay position is unique to 6W modified chassis.
Try to unplug the white plug in the dashboard when the same situation happens to your VC66.
