No pumps
Thread Starter
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Mountain Pass
Joined: Dec 2006
Posts: 225
Likes: 44
From: OR
No pumps
When I turn my key on, on my 86 ranger with a 2.9L V6, my pumps do not kick on for three seconds as they should. I have power at my fuel pump relay when my key is on, and when I ground a certain wire from the fuel pump relay, it stays on and does not shut off until I remove the ground. Any help? Thanks
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
See if you can pull the codes.
Looks like the computer/ECM isnt grounding the tan/green stripe wire from the pump relay as it should.
If the ECM is dead/not grounded/not receiving voltage you wont be able to pull the codes.
So take a couple of minutes to see if you can pull codes and post back.
Looks like the computer/ECM isnt grounding the tan/green stripe wire from the pump relay as it should.
If the ECM is dead/not grounded/not receiving voltage you wont be able to pull the codes.
So take a couple of minutes to see if you can pull codes and post back.
Last edited by 87 XLT; Dec 15, 2006 at 06:03 PM.
Thread Starter
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Mountain Pass
Joined: Dec 2006
Posts: 225
Likes: 44
From: OR
well, I have no check engine light, and I was using an analog volt meter. I have to do it a certain way though. I am going to bet money it's the eec thats been causing me trouble, because, it should ground the relay, and make it shut off and on for 3 seconds, does that sound right? I have checked almost every possible wire that comes off of the fuel pump relay and can't find any damaged or disconnected wires. This all leads me to believe that my eec is shot, unless a sensor is causing my fuel pumps not to come on at all. But, when I make my pumps come on and try to start my truck (I have spark) I can't get my truck to start. What could possibly cause this, maybe a bad eec? or two of them?
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
Looks like theres 2 things the ECM is not doing, it's not grounding the pump relay & not pulsing a ground to fire the injectors.
The ECM is toast or it's not receiving power from the EEC main relay or it isnt grounded.
The factory wiring diagram for my 87 2.9 shows voltage from the EEC main relay to the ECM is on 2 solid red wires.
Pull the connector off of the ECM, turn the key on & see if you have 12 volts on those red wires.
On my 87 the ECM ground wire splices into the negative battery cable near the battery.
If you have voltage on the 2 red wires & a ground on black/light green then it looks like the ECM is shot.
BTW, my 87 is not equipped with a check engine light, are you sure your 86 has one?
Edit, i'm guessing your 86 is wired the same as my 87.
Have you got a decent set of wiring diagrams for your 86 so you can double check the color coding of the wires?
The ECM is toast or it's not receiving power from the EEC main relay or it isnt grounded.
The factory wiring diagram for my 87 2.9 shows voltage from the EEC main relay to the ECM is on 2 solid red wires.
Pull the connector off of the ECM, turn the key on & see if you have 12 volts on those red wires.
On my 87 the ECM ground wire splices into the negative battery cable near the battery.
If you have voltage on the 2 red wires & a ground on black/light green then it looks like the ECM is shot.
BTW, my 87 is not equipped with a check engine light, are you sure your 86 has one?
Edit, i'm guessing your 86 is wired the same as my 87.
Have you got a decent set of wiring diagrams for your 86 so you can double check the color coding of the wires?
Last edited by 87 XLT; Dec 16, 2006 at 02:40 AM.
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Thread Starter
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Mountain Pass
Joined: Dec 2006
Posts: 225
Likes: 44
From: OR
I do have a wiring diagram but all of the wire colors are off, but I know where all the fuel pump relay wires go. I ripped all of the wire bundles apart so I could check the wires to make sure they were all right and they are fine. I know my 86 does not have a CEL, did I say that my truck did, if I did it was not intensionally. I am pretty sure my eec is shot, I will go check my grounds and do all of the things you said. What should I do next once I did all of the things you said and they were allright?
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