Wankel7

I have done the fuel pump rewire and want to confirm it works 100%. The pump runs the car so I am sure that part works.

I know the pump voltage goes from 9volts to a higher voltage under load. I also know I can connect a voltmeter while I am driving and floor it and see what it does.

But, is there any way to simulate a load situation on the car while it is off?

How does the car know to give the fuel pump full voltage? TPS? Airflow meter? Presure sensor? When I jump the yellow connector does that give it full voltage?

Thanks

James

Wankel7

Come on now? Nobody knows what tells the pump to up the voltage?

James

j9fd3s

iTrader: (3)

on the fd it switches over at 1 psi of boost, but ive never even seen anyone test an fc. it either works the same as the fd or it switches over at a set rpm. you can kinda half *** load test it if you turn the car one and turn every accessory on, lights, defroster, radio and see what it does.

mike

dre_2ooo

RETed knows how... it's on his site somewhere.

Wankel7

Huh, I will have to look at it agian. Thanks

James

Wankel7

Found it on teds site. He says that it is under full voltage when cranking and under boost. So I guess I could get a hand pump and plug it into the boost sensor and pump her up to like 8psi. That is the only sensor that tells the ecu what the boost is I believe.

IT would be sooo cool if the fsm told us what goes on inside that ECU

James

Wankel7

http://fc3s-pro.com/TECH/MODS/preliminary.htm

That was the page....thanks Dre

HAILERS

Online manual at www.fc3s.org. 89 manual. Page F2-74 and F2-75.

Things that influence the voltage: knock sensor, pressure sensor, tps(full range), o2 sensor, heat hazard sensor, milage sensor no.1 and no.2, back-up light and 5th switch, rear defroster sw, blower sw, head light sw, fog light sw, a/c sw, power steering pressure sw, test connector.

HAILERS

This should work. Get your engine hot. Turn the engine off. Wait a moment. Turn the engine back on. The voltage should read the full 12v for about a minute, then switch to approx nine volts and stay around nine volts.