Toyota Engine PCM ECM ECU fuel pump turn on / circuit opening relay Up for sale is a Working, in excellent condition Toyota / lexus circuit opening relay. This unit turns on power to the fuel pump / Electronic control module. If defective, it may mimic the symptoms of a defective ECU / or fuel pump. These are rather expensive to buy new, and usually last the life of the car, but if a failure occurs- which does sometimes happen, the car will be dead in it's tracks. Check this first. See part numbers at the top of the listing. - . This unit offers a 30 day functionality warranty. As always with this type of component your best bet is to match the part number to the one on your original unit. These can also cause no start or random stalling problems with these cars.