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» no power from PCM to fuel pump relay
jl102284
 Posted: Aug 24 2017, 08:35 PM
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My 94 Aspire turns over but does not start, not getting fuel.
All fuses, the fuel pump and fuel pump relay are good.

I have determined that the fuel pump relay is not receiving power from the PCM.
I think the problem could be:

1. the pcm not receiving a signal from somewhere (either the ignition switch or ???) to tell it to send power to the fuel pump
2. a bad pcm
3. an open wire between pcm and relay.

I am unsure how to troubleshoot this to determine the problem.
Is the ignition switch the only thing that signals the pcm to power the fuel pump or is there something else?
How do I diagnose the problem from here?
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Glow_Mouse
 Posted: Aug 25 2017, 03:12 AM
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Alright, so what you'll need to do is determine whether the pump is actually sucking fuel. I recently changed out my fuel pump on my glowspire and what I can see, it's an ignition switch linkup only. Also check to see that the kill switch (Located in the boot behind a check door) It's the one access panel on the passenger's side unless you're Asia Pacific in which case it will be the driver's side is not triggered. In these cars, during a crash they're designed to quickly trigger shutting off power to the pump to avoid any fuel explosions.

Also, ensure there are no blockages as gunk and fuel scum can accumulate in the fuel lines and this is freakin frustrating when it happens. Lastly, as you mentioned, check fuses and if they're alright then proceed to trace the fuel pump electrical connection back. You'll know it connects to the ignition as this is a direct hookup between key barrel and pump itself. Try that, if problems persist, throw a huge tantrum and come back here and we'll try to help you again. tongue.gif

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jl102284
 Posted: Aug 25 2017, 05:49 PM
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Thanks for the reply glow mouse.
I found the problem it was my own stupidity.
I was working on something unrelated under the hood and forgot That I unplugged the two electrical harnesses that plug into the distributer.
Apparently one of those wires tell the pcm when to send power to the fuel pump.

So now the car is running, I will start another thread about the other problem I am having.
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Glow_Mouse
 Posted: Aug 26 2017, 02:49 AM
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Very good. Glad you were able to solve it.

Onto the next one! biggrin.gif

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Raising the bar for compact cars around the world.
.:: 1997 Aspire ::. - Revived Project - Glowspire
.:: 1998 Aspire ::. - Current Project - The Red Bean

user posted image
www.FordAspire.com - The World's #1 resource for aspire/avella & 2nd Gen Festiva
"Why Do you own so many bodykit parts?"
"I like to change the look of my car like i change underpants....everyday!"

Glowmouse's 97' Glowspire Build
Glowmouse's 98' Red Bean Build
My DIY Wing Conversion How-To
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