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| ECM not sending fuel pump command (Page 2/2) |
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Raydar
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DEC 02, 10:31 AM
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| quote | Originally posted by phonedawgz:
Is your ECM getting power and is it running? Key on, does the Check Engine light come on? It should.
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These were my thoughts, as well.
But if the ECM is pulsing the injectors, it should be good in that regard.
But the driver for the fuel pump relay could still be fried. Wouldn't be the first time that has happened.
Edit - The 85 V6 had a "one year only" ECM, and may be a bit "uncommon". If you have to replace the ECM, any Fiero V6 ECM will work, as long as it is from a car with the same transmission as yours (auto vs manual), and still has its correct EPROM chip.
Your 85 EPROM will only work in an 85 ECM.[This message has been edited by Raydar (edited 12-02-2022).]
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sanderson231
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DEC 02, 05:34 PM
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ignore this post [This message has been edited by sanderson231 (edited 12-02-2022).]
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sanderson231
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DEC 02, 05:53 PM
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I stand corrected. Power from the ignition switch gets to the ECM through the ECM IGN fuse. That should tell the ECM to run the fuel pump. So check the ECM fuse if the ECM is not putting power to fuel pump relay. The safest way to check for the ECM putting power to the fuel pump relay would be to back probe the right wire at the ECM connector.
As Theogre has mentioned, I can see that a faulty ECM ground could also be a culprit.
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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sanderson231
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DEC 02, 06:02 PM
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| quote | Originally posted by A_Lonely_Potato:
gotta disagree with you there. my fuel pump ran when i applied power to the green wire at the ECM side, before i had fixed the wiring. OP, check the wiring! even if readings seem normal, check it! |
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Look at the wiring diagram. There is no way the fuel pump will run if the dark green/white wire from the ECM to the fuel pump relay has an open or has gone to ground. Maybe you had melted insulation but it hadn't gone to ground.
Edit - Perhaps it is possible for the insulation to burn of the dk-grn/wht wire and it makes a momentary contact with ground which then takes out the ECM circuit. Because the ground contact was nor permanent the wire acts normally allowing the fule pump to run.
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged[This message has been edited by sanderson231 (edited 12-04-2022).]
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