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Fuel Pump Relay - No ground connection from ECU


CO94LEV6
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So I spent the day yesterday troubleshooting my 94 LE for the fuel pump not working. Put in a new pump and relay and still nothing. Traced the problem to the relay not getting a ground connection from the ECM. What controls the ECM to initiate the completion of the ground connection? Is there a sensor or something that tells the ECM to cut the ground and stop the fuel pump? I just cut the ground wire at the ECM and connected the relay wire to the grounding screw and it runs now, but would like to fix it properly.

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There is probably a bad component in the ECM. The ECM is programmed to turn on the fuel pump for a few seconds when ignition is turned on. Then when there is a tach signal the ECM turns on the fuel pump. I would try swapping out the ECM. If you are in the Summit county area (Breckenridge) I have a spare ECM that you can try.

 

Hit me up and we can figure out something.

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  • 2 weeks later...

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