Here's what I have determined so far:
> Both the ecm-b fuse and the fuel pump relay are hot, both receiving full 12 volts with ignition on or off.
>Fuse and relay both check out ok.
> Ecm-b circuit goes to the ignition switch and then to the fuel pump via the grey wire, but only delivers 5 volts.
> Grey wire will remain hot as long as ignition is on, even if relay is removed.
> Coil side of relay becomes hot when engine is cranked, and remains hot for about two or three seconds after stopping. This circuit terminates at upper left terminal of square plug on fuel pump, and delivers full voltage.
> Fuel pump does not run, even when full voltage is applied to grey wire.
Tuesday, November 3rd, 2009 AT 1:47 PM