Fuel Pump Resistor Relay
05-06-2004, 08:20 AM
#1
Junior Member
Thread Starter
Join Date: Apr 2004
Posts: 24
first of all.. will 9v turn on a standard 12v automotive relay or does it have to be 12v? second, the resistor has a wire running to it from the ECU to the relay part of it, when that wire is 12v does it open or close the resistor. in other words, is the wire from the ECU 12v at idle or at WOT??
05-06-2004, 11:18 AM
#4
Senior Member
Join Date: Sep 2003
Location: Raleigh, NC
Posts: 122
your fuel pump has a resistor box as well, it limits the voltage to the fuel pump and then at WOT it opens up to a full 12v.
as for your injectors they should stay at a constant voltage
you say the car will idle so its starting. if it was your injectors most likely the car wouldn't start because the injectors would be fireing properly
as for your injectors they should stay at a constant voltage
you say the car will idle so its starting. if it was your injectors most likely the car wouldn't start because the injectors would be fireing properly
05-06-2004, 11:53 AM
#5
Junior Member
Thread Starter
Join Date: Apr 2004
Posts: 24
i dunno how this has anything to do with what i was saying. but i am not doing this to fix my idle problem. this is just something i want to know. im not talking about the wire running to the fuel pump.. i know what the relay/resistor is.. thats why i am posting about it lol. a wire runs from the ecu to the relay/resistor, i wanna know if thats 12v at idle or what. im pretty sure its the green/red wire on an S4 TII. just wanna know if its 12v at idle or 12v at WOT. thanks.
05-06-2004, 04:02 PM
#7
Junior Member
Thread Starter
Join Date: Apr 2004
Posts: 24
sorry but i dont think this tells me WHEN the ecu is pushing 12v to the resistor/relay. i see nothing pertaining that.. i know how its setup.. i wanna know if the ecu pushes 12v on the green/red wire at idle or at wot.
