slow93si

Well me car (a 93 si) won't start but the starter is trying. It is throwing a check engine light n when I go to do that code scan thing nothing comes up. So I have talked to a couple of friends of mine and this what we have come up with that it maybe: main relay, coil, ICM. So i went n got a new relay because I didnt hear anything clicking like I am soppose to hear with the fuel pump. I put the new one in and nothing again so i took out my back seat to get to the pump and tested to see if it is getting power n it is not. Now i have no idea what to do next. Should i go to get another relay cause the new one may be blown too? Is there a little fuse some where that I am not thinking about for the fuel pump? Or is there anything else that u guys can think of? PLEASE HELP!!!!!

slow93si

OK i went back out there to see if i was even geting power to the main relay n i wasnt. I have the key in the car and on. also the battary has power n is hooked up to a charger to make sure. Does anyone know where the power to the main relay comes from????

93FlatBlackHatch

Make sure you check all of your fuses. The relay gets power from the ecu. I had the same problem in my car and it ended up being a bad ecu. Here is what you can do to test it. Get a multimeter to check the voltage at the map sensor. It should have 5 volts if doesnt check for voltage between the d19(+) and d21(-) pins of your ecu plug. If there isnt voltage replace the ecu.

blu3g

yeah there's a fuel pump fuse. That same thing happened to me, left me carless for a week. If you look at your fusebox it should be one of the two that sits higher than the rest.