CAR DOES NOT WORK * First make it sure ECU ' s led is blinking at KOEO is seen ECU power OK. another way to find out ecu is powered and grounded when car is KOEO state measuring any sensor power example TPS sensor if you see +5V ECU is normally grounded and poweredi. if not. you dont seen ecu havent got power and ground. it s cause can be main relay near to dash. it is two relay on one box. Ater ignition is no one relay is goes on and supply power to ECU afret ECU powered it Grounrded second relay and supply ground to fuel pump. you hear sound that fuel pump functional.