No power to main relay/ecu

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Old Feb 15, 2010 | 10:57 PM
  #1  
DCRB's Avatar
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From: Portland, OR, USA
Default No power to main relay/ecu

Car's a 91 std mpfi swapped. car was running, then one of the injector wires came un done at the ecu when it was kicked (no ecu cover ftl) and then the car just died. no blown fuses, no blinky led, tried two other ecu's (both known working, one is a ps9 and one is annother pm6). main relay does not click, cel comes on the second the key is turned to number 2, and just stays on. we also tried another known good main relay. not sure what is wrong here, but all the wiring appears to be good. didn't check for spark yet, but it cranked strong, just isn't running because the ecu isn't getting power. only code it was throwing before accident was for the coolant temp sensor...

any one have any ideas to help us out?

TIA!

Ryan
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Old Feb 15, 2010 | 11:51 PM
  #2  
nitewolf's Avatar
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From: Eastside, WA, United States
Default Re: No power to main relay/ecu

check fuse 14 alt solenoid fuse(2nd fuse top left)
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Old Feb 16, 2010 | 10:02 PM
  #3  
DCRB's Avatar
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Default Re: No power to main relay/ecu

ok did that still nothing. also he checked all the grounds. is there something we are over looking? all the fuses are good, battery sends power to the ignition... could the ignition switch cause this?
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Old Feb 17, 2010 | 02:52 PM
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Default Re: No power to main relay/ecu

just got home from work bump!
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Old Feb 17, 2010 | 03:41 PM
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Default Re: No power to main relay/ecu

got the same problem man. I need help too!
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Old Feb 18, 2010 | 01:53 AM
  #6  
DCRB's Avatar
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From: Portland, OR, USA
Default Re: No power to main relay/ecu

ok figured it out it WAS a blown fuse. the fuse was one of those zig zag fuses (as apposed to the u shaped ones) and w/o pulling it out it appeared to not be blown because it popped on the far corner. I told him to pull all the ten amp fuses out and double check/replace them. he did, and that's when he found the blown fuse.
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Old Feb 18, 2010 | 08:20 AM
  #7  
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From: eugene Or.
Default Re: No power to main relay/ecu

that was my problem for 2 damn weeks......and it was fuse 14, i was pissed
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Old Jul 27, 2010 | 05:10 PM
  #8  
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Default Re: No power to main relay/ecu

I have the same problem, my relay is getting no power at all, but we tested it and it is still good, just no power, and it happened out of nowhere. the car started one minute, then the next it didn't and no longer will. The rear defroster fuse was blown, but no other ones were.
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Old Sep 26, 2010 | 06:22 PM
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slowredsol's Avatar
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From: in da ATL
Default Re: No power to main relay/ecu

no reply? Im having the same problem, no power to the main relay plug.
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