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No power to coils fuel pump or injectors
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Pollycranopilis
New User
May 2, 2014, 1:38 PM
Post #1 of 7
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No power to coils fuel pump or injectors
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1988 Mazda RX7 Turbo after overheating has no spark and no power to coils, main relays have no power signal and no power to fuel pump and injectors, manually initiated the relays and got spark but have no idea why this is happening all these circuits are on same wire a black with white stripe but with key on it is grounded any help will be appreciated!
(This post was edited by Pollycranopilis on May 3, 2014, 4:18 PM)
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Hammer Time
Ultimate Carjunky
/ Moderator
May 2, 2014, 1:42 PM
Post #2 of 7
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Re: No power to coils fuel pump or injectors
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You said it overheated. Dis a wire get melted anythere? ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
May 3, 2014, 3:29 AM
Post #3 of 7
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Re: No power to coils fuel pump or injectors
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At the main relay do you have power on the following wires with the ignition on? black/white black/green white/blue Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Pollycranopilis
New User
May 3, 2014, 11:18 AM
Post #4 of 7
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Re: No power to coils fuel pump or injectors
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Black\white =ground black\green = +12v white\blue = +12v black/white =full ground key off key on is not full ground but 10v or so
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Hammer Time
Ultimate Carjunky
/ Moderator
May 3, 2014, 11:26 AM
Post #5 of 7
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Re: No power to coils fuel pump or injectors
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Something is pulling that voltage down on that wires so we are back to looking for melted or shorted wires. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
May 3, 2014, 11:27 AM
Post #6 of 7
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Re: No power to coils fuel pump or injectors
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According the wiring schematic there are two black/white wires going to the main relay. Does the relay make a clicking noise when you turn the ignition on and off? One black/white is hot when the ignition is turned on and powers the coil inside the relay. The other black/white wire goes to the coils and injectors and is hot when the relay is energized. You have to make these checks with the relay plugged in. That means you have to back probe the relay connector and make your measurements. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on May 3, 2014, 11:28 AM)
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Pollycranopilis
New User
May 4, 2014, 9:57 AM
Post #7 of 7
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Re: No power to coils fuel pump or injectors
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coil on relay never energizes the b/w wire is not sending the +12 to it same wire goes to main relay for fuel injectors and ignition coils and the fuel pump
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