Question about 1989 Honda Civic

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Error code 14 which is EACV.... My Hanyes book says unplug wires and test voltage on wires coming to EACV. IT says if I have battery voltage the my ECU is bad. Well I tested it how they say with ignition on and I get 11.1.V on wires, and my battery is 11.45V. SO my questions am I getting battery voltage or is this 11.1V ok. My book does not give a voltage level just says if battery voltage then bad ecu. will a bad EACV cause high HYDRO CARBONS Here is some additional info on what I have done and about me trying to smog but wont pass. As one of you guys said a bad CAT is possible problem, but I failed to mention that I had error 14. I have a 1989 honda civic that never had smog problems till after a rebuilt head was installed. Mechanical timing is dead on, checked with timing light as well and dead on 18BTDC. Engine has new head, new air filter, oil, oil filter, o2 sensor, raditor, plugs & wires, distributer cap and runs real good but fails too high hydrocarbons? What are most common thing I should check. I really dont have a lot of money to put into this car so I would like to be able to test my parts before replacing them. Thanks Brian

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  • bjingles Jul 25, 2009

    Well my book calls it EACV but same thing anyways, I dont uderstand part of what you said, how do I test it? does the car need to be running or just ignition on? Because I did test it with just ignition on and wires give 11.1v and battery is 11.45v I am going to look up the tps as well and see where it is on my throttle body

  • bjingles Jul 25, 2009

    I trust you with out a doubt, but with out my book I cant even find the TPS. WHat I did find was a Thorttle Control which is Vacum controlled. How do I find the TPS.. Thanks again

  • bjingles Jul 25, 2009

    hey I think I got it now thanks for you help, All the testing I had been doing was on wires and voltages. I finally just pulled the IACV out and ohm the 2 leads to its case and they were fine. but when I ohm between the it is an open, my book says they should be 8 to 15 ohms. So I am pretty sure this IACV is bad. But dam these things cost a lot of money.... Thanks again.... I hope it passes smog after I replace part

  • bjingles Jul 25, 2009

    Thank you I got it working it was IACV

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  • Honda Master
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THIS CODE IS FOR THE IACV (IDLE AIR CONTROL VALVE) NOT EACV, CHECK AND VERIFY THAT THE CLOSED VOLTAGE OF THE THROTTLE POSITION SENSOR IS AT .45 VOLTS AND THE WIDE OPEN THROTTLE SETTING IS 4.5 VOLTS, REPAIR AND ADJUST AS NECESSARY, IF THERE IS ANY DOUBT REPLACE THE TPS SENSOR ON THE THROTTLE BODY

Posted on Jul 25, 2009

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  • yadayada
    yadayada Jul 25, 2009

    THE TPS VOLTAGE SETTING AT IDLE AND WIDE OPEN THROTTLE IS CRITICAL TO PROPER IACV OPERATION, THIS AFFECTS HC EMISSIONS GREATLY

  • yadayada
    yadayada Jul 25, 2009

    THE ENGINE IS OFF AND THE IGNITION IS ON, IT IS NOT EACV, IT IS IACV.

  • yadayada
    yadayada Jul 25, 2009

    MAKE SURE THE CLOSED THROTTLE VOLTAGE OF .45 VOLTS IS WHAT THE TPS IS SET AT., FORGET THE TROUBLESHOOTING YOU READ IN THE BOOK. TRUST ME ON THIS

  • yadayada
    yadayada Jul 25, 2009

    OK YOUR SYSTEM IS DIFFERENT FROM OTHER HONDA FUEL INJECTION, IT IS TBI, SORRY FOR LEAD NG U DOWN THE ROSEY BUT GO TO THIS PAGE AND READ ALL ODF THE POST ON CODES 14 AND 16, BEAR WITH ME THIS MAY ANSWER YOUR QUESTIONS ABOUT THE CAUSE OF 14

    http://www.honda-tech.com/showthread.php...

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or why you don't know if both motors are working
I work from factory wiring diagram books, I buy for
all my vehicles
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