Question about 1991 Honda Accord

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NO START OK WERE TO START I HAVE A 91 HONDA ACCORD THAT I REPLACED SOME FULTY SENSORS ON THE THREE TEMP AND SPEED SENSORS , CAR RAN GREAT FOR AN HOUR OR SO TURNED IT OFF WENT BACK 10 TO 20 MIN LATER AND IT WOULD NOT START A CHECK FOUND IT HAD NO SPARK A CHECK OF ALL IGNITION PARTS SHOWED NO POWER BETWEEN THE PGM-FI ECU AND THE IGNITER TRACED BACK FROM THERE FOUND A BLOWN FUSE AT THE ECU POWER WIRE REPLACEMENT BLOW AS SOON AS I INSTALLED IT I KNOW THIS MEANS A DEAD SHORT BUT HAVE BEEN UNABL TO FINED IT PLEASE HELP

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  • jwkrjohn Jul 02, 2009

    ive checked all the relays

  • jwkrjohn Jul 02, 2009

    its a dead short at the ecu after replacing 4 sensors any thoughts

  • jwkrjohn Jul 02, 2009

    didnt drive it happen right after swop

  • jwkrjohn Jul 02, 2009

    out of the sensor witch on would be most likly it was three temp sensors and the speed sensor

  • jwkrjohn Jul 02, 2009

    yes i did

  • jwkrjohn Jul 02, 2009

    you respones have helped new addon though fuse still blows but now the fan comes on just befor and the cars not running to get hot yet

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6 Answers

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Boy that sucks. I assume you weren't having the blown fuse problem before you started, I can think of 2 options. Forgive me if this sounds dumb, First take a flashlight if necessary and carefully retrace every step that you did, looking for any pinched wires or anything out of ordinary. I know in my own experience, if I get a new problem only after I worked on something I probably did something without realizing it. We all do it. The second solution is to get a manual with a wiring diagram and a multimeter and start tracing wires, With battery disconnected, on a continuity check between hot wires to ground. Could be very time consuming. Sorry can't do better than that.

Posted on Jul 03, 2009

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The electronic circuit that depends on that fuse is the one that is shorted. Semiconductors used in electronic circuits do not open. , they short. To confirm this, unplug the box that it depends on then put the fuse, if it dont blow this time that electonic box has a shorted semiconductor. Do that, and let me know the result. We may even be able to fix the electronic circuit but I can't promise you a hundred percent on that.

Posted on Jul 02, 2009

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Read your problem very carefully and after a lot of analysis, I got into conclusion that you needs to replace your spark plug with a new one. At least this will remove your problem temporarily and you car will come out of this DEAD lock. And after that we can discuss further to help you.

With Regard,
Shyny Saxena

Posted on Jul 02, 2009

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Review all of your connection maybe there is a shorted when you replace the 4 sensors. Trace the wiring from the fuse to each sensors and put an electrical tape to each open wires to avoid shorted.
Just copy paste this link for more information...

http://hondaaccordforum.com/forum/archive/index.php/t-13341.html

Good luck;

Regards:
VOTIT

Posted on Jul 02, 2009

  • LORETO LACARON
    LORETO LACARON Jul 02, 2009

    In a circuit board where the relays is placed look for a shorted diode there.



    Regards:

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It could be the computer. Otherwise it is connection to ignition module

Posted on Jul 02, 2009

  • Nate Stansfield
    Nate Stansfield Jul 02, 2009

    It would be hard to tell. But, you can use a multi-tester or ohmmeter and test each sensor to see which one is not giving a reading. Did you disconnect negative battery cable before doing the work?

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Hi,

Do you hear the fuel pump working? Does it start for a second and then dies? Does it start in cold weather, or in the morning, and not in hot weather and after it's been left in the sun?

Open up the hood and all doors. Allow the car to cool down as fast as possible when it won't start. Try starting it in 2-3 minutes. If it will start that way - you might have a faulty main relay. Again, i'm not sure if newer hondas even have the main relay, but you might ask the dealership if they could take the relay out (if it exists) and check it's joints.

The trick here is that the relay is inside the cabin, so opening up all doors and hood would just allow the car to cool down a lot faster, and hondas with a faulty main relay don't have troubles starting in cold weather.

and

Here's a cheap thing you can do to see if it's your battery.

Take your power cables, connect your battery to a known good battery in another car, and try to start your car. If everything runs normal (does not turn over sluggish, lights are normally bright...), then it's most likely your battery.

Thanks for contacting Fixya.

Posted on Jul 02, 2009

  • e-Guru
    e-Guru Jul 02, 2009

    Its deffinately a open wire. I would check your o2 sensor wires first, their usually the prime culprits. other then that just keep tracing until u find a open wire in your engine bay.



    So start your car when you can, and let it idle. See if it ever dies that way. If it only happens while your actually driving, that limits the possibilities.

    O2 is a good guess! (i'd check that aswell)

    A p13 pinout for the ecu would be a necessity in your case!
    I found the layout for the p14 using the search option in archives. I don't exactly remember what I typed in the search quary.

    How long have you been driving problem free since the swap?

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