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The EV-ECU is the brainbox of the car. It controls nearly everything in the car, including regulating charging. It listens to whichever EVSE you plug into via the J1772 connector, basically reading the pilot signal from the EVSE to determine maximum amperage allowed, but also using another pin to detect if the plug is in the car. It talks via CANbus to the charger, to read incoming voltage and to set the charging rate. The EV-ECU gathers battery data from the Battery Management System (BMS), which is located within the battery pack and is attached to every cell in the pack to read voltage, and each group of cells (not sure of the exact number) to gather temperature. If you have the quick charge port, it is in direct contact with the quick charger on a separate CANbus. For quick charging, the car tells the quick charger what amperage it wants, and performs numerous checks throughout the entire time the quick charger is plugged into the car.The issue you are seeing, where the car will charge, but not completely, sounds like you have a bad cell or two in your battery pack. If the car does not charge at all, then I would look at the charger and the relays and fuses located under the hood and dashboard. If the EV-ECU is actually the problem, I would be surprised.
The EV-ECU is the brainbox of the car. It controls nearly everything in the car, including regulating charging. It listens to whichever EVSE you plug into via the J1772 connector, basically reading the pilot signal from the EVSE to determine maximum amperage allowed, but also using another pin to detect if the plug is in the car. It talks via CANbus to the charger, to read incoming voltage and to set the charging rate. The EV-ECU gathers battery data from the Battery Management System (BMS), which is located within the battery pack and is attached to every cell in the pack to read voltage, and each group of cells (not sure of the exact number) to gather temperature. If you have the quick charge port, it is in direct contact with the quick charger on a separate CANbus. For quick charging, the car tells the quick charger what amperage it wants, and performs numerous checks throughout the entire time the quick charger is plugged into the car.
The issue you are seeing, where the car will charge, but not completely, sounds like you have a bad cell or two in your battery pack. If the car does not charge at all, then I would look at the charger and the relays and fuses located under the hood and dashboard. If the EV-ECU is actually the problem, I would be surprised.
