VX died Help....

[Y33TREKker]

Checked the ECM relay.

Confirmed I had good ground circuits to the ECM.
Confirmed I had a good ignition circuit to the ECM
Confirmed I had a good battery circuit to the ECM.
Confirmed the injectors are not firing.
...

Which relay are you referring to when you say ECM?

Are you talking about the one in the manual's diagrams labeled "PCM Main Relay" in the fuse/relay box in the engine compartment?

If not, that's one possible culprit. Another would be the 40Amp EB18 "PCM" fuse in the same fuse/relay box.

The PCM relay would be affecting the powertrain control module, the fuel pump relay, and the fuel injectors.

[bcbike]

Correct PCM. I checked both relay and fuses both are good.

[bcbike]

I Should start a new post "what would you buy if your VX died"

[Maddawg]

I also noticed the fuel gauge reads below empty with no movement when I turn on the key, (i have 1/2 tank of fuel), also no check engine light with the key on. No fuel pressure when I attempt to start it. Fuel pressure when I jump the relay, no fuel gauge and no check engine light. Prior to this no problems, I'm stumped.

Any chance there is a fuse out somewhere?

[Mile High VX]

I Should start a new post "what would you buy if your VX died"

http://www.vehicross.info/forums/sho...t=replacing+VX

Go ahead...join the fun!

[Leon R]

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.

[tom4bren]

... 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...

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?

[Ldub]

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?

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.

[Scott Larson]

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".

[tom4bren]

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...

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.

[Scott Larson]

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"...

[Dmitrikr]

did he mention no pulse on injectors? camshaft sensor fault-?

[tom4bren]

HMMM ... wonder if it's controlled by the airbag sensor.

bcbike - is your SRS lite on?

[tom4bren]

did he mention no pulse on injectors? camshaft sensor fault-?

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.

[Leon R]

did he mention no pulse on injectors? camshaft sensor fault-?

That is what I was thinking, but why would it fire the coils? Usually spark goes along with the fuel.