Fuel pump is working. He gets pressure at the fuel rail if he jumps the relay. Basically; he's getting power & ground to the relay, the relay functions if jumpered, he's just not getting signal to it from the computer.
Super VXer
Fuel pump is working. He gets pressure at the fuel rail if he jumps the relay. Basically; he's getting power & ground to the relay, the relay functions if jumpered, he's just not getting signal to it from the computer.
[SIGPIC][/SIGPIC]
Put a smiley after you say that Bub.
Member
Correct PCM. I checked both relay and fuses both are good.
Member
I Should start a new post "what would you buy if your VX died"
Super VXer
http://www.vehicross.info/forums/sho...t=replacing+VXOriginally Posted by bcbike
I Should start a new post "what would you buy if your VX died"
Go ahead...join the fun!
Live, Love, Forgive and Never Give Up
Super VXer
Any chance there is a fuse out somewhere?
3" suspension lift, shocks: Rancho 9000, tires 33"x11.5", wheels 16"x8", offset= 0, no front sway bar
Super VXer
Typically, ECU does not turn on the fuel pump until you start cranking. That is when it sends a signal to fuel pump relay to turn on. Have you checked if your FP relay is getting such signal?
Has your "scanner" worked previously, when VX was running well? If so, and now your scanner can not connect, I would also suggest a bad computer. But... if your computer is so messed-up that it will not connect and will not run fuel pump/injectors, it is unlikely that it would fire the ignition... So something doesn't add up here.
Super VXer
It may not be as surprising as you might think.
The fuel pressure relay activation is considered part of a safety critical circuit. In the event of an accident, that relay is supposed to be disabled to prevent fuel from being sprayed around & creating a fire hazard. Safety critical software is typically compartmentalized & isolated from the rest of the operating system. The ignition & starter would not be considered safety critical.
That does bring to mind a surprising thought though (surprising because I thought of it). What is the sensor that shuts down the fuel system in the event of an accident & could that be his culpret?
Super VXer
Maybe in a "typical" vehicle...
I can hear mine pressure up as soon as the ign is in the on pos, before any cranking over of the engine.
Super VXer
Tom, you're referring to the rollover sensor. When it's faulty it shuts down the fuel pump as it would in case of vehicle rollover...
It's default mode is "off".
Vixer Fixer
Super VXer
So the fuel is only shut off in the case of a roll over ... not for front impact. That's not a very enginerddy approach to safety.
Super VXer
The name is a bit of a misnomer, as you are correct, in "severe" impacts it is supposed to shut the pump down regardless of the orientation of the vehicle, "supposedly"...
Super VXer
HMMM ... wonder if it's controlled by the airbag sensor.
bcbike - is your SRS lite on?
Super VXer
did he mention no pulse on injectors? camshaft sensor fault-?
Super VXer
He gets no pressure at the fuel rail (unless he jumps the relay) so it's not that.
Rekin we should just table the discussion till he gets his new 'puter & tries it out.
Super VXer
That is what I was thinking, but why would it fire the coils? Usually spark goes along with the fuel.
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