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Civic 93 delay to turn off the check light (engine doesn't start while CEL on)

Discussion in '5th Generation Honda Civic (1992-1995)' started by ElMaq, Feb 9, 2017.



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  1. ElMaq

    ElMaq Respected

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    Location:
    Rio de Janeiro
    Hi!

    I have a Civic 93 1.5 (D15b7) sedan that never gave me any problems until 2016 when it started the following problem:

    When I turn the key on, the Check Engine light is on. The normal is to turn off after 2 sec. When you turn the key, you can't hear the click of the relay or the fuel pump working.

    Then I leave the key turned on, after about 30 seconds to 90 seconds, you hear the click of the relay and the pump working. So the light turn off and I crank and immediatellythe car starts fine without any problem.

    Once it get it work, the more I drive, the less it happens this problem. Example: when I leave home, it takes 1 minute to turn the light off, but if I stop at gas station, I turn the key on and the check engine light will turn off normal (2 seconds).

    Replaced: brand new fuel pump, BN main relay relay, BN filters, BN TDC / CRK / CYL sensors, used ECU.

    Gets the same symptom.

    I've checked grounds, connectors, all fine. The car never got water inside.

    I made the jumper and did not retrieve any code

    WHILE CHECK ENGINE IS ON, CAR CRANKS BUT WON'T START

    Does anyone have any idea what is this?

    regards from Rio
     
  2. boofoo

    boofoo Respected Registered VIP

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    This type of problem is usually caused by a bad ECU if you ruled out a bad main relay. The used ECU you bought may also be bad. There are a lot of bad P06 ECUs around after 25 years.
     
  3. ElMaq

    ElMaq Respected

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    Boofoo, I think you're right. I leaved my ECU on automotive electronic repair. They repair ECU, keys, alarms, cd players and amplifiers. I'll post result when he finish repair
     
    5SpeedEJ6 likes this.
  4. SD_760

    SD_760 New Member

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    Yo I got the sameee problem. I just picked up this 93 Civic Lx sedan. Solid check engine , cranks won't start. New battery new plugs , wires new distributor ( prev owner did all this) I just replaced o rings for one injector and tightened fuel rail. I'm buying a volt meter so I can go through the steps I seen on Glennh post about fuel pump not priming. Gonna hit pick your part and grab a ecu today cuz it's 50% off. Keep u posted w what happens
     
  5. boofoo

    boofoo Respected Registered VIP

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    :thumbup:
     
  6. SD_760

    SD_760 New Member

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    Didn't find the right ecu so I ordered one off eBay for 80$. Picked up some random parts , including an OEM main relay - Ok so I jumped the main relay connector from 1-7 and 5-7. the fuel pump would prime at 1-7 but not at 5-7. All the fuses are good. This was a 1-owner car 129k original miles. Nothing has been touched. No signs of rats. i just barely got this car so im still looking to see what's going on. I figure I'll replace the ECU and if that doesent work I'll go buy a nice multimeter and start poking around. I'll start to post pics in a bit and try to be thorough.
     
  7. boofoo

    boofoo Respected Registered VIP

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    Dash fuse 24 may be blown if the 5-7 test does not work. Redo the test to verify the result.
     
  8. SD_760

    SD_760 New Member

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    Ok I just re did the test , 5-7 no pump prime , replaced fuse 24 with new 15 amp fuse , retried , nothing.
     
  9. boofoo

    boofoo Respected Registered VIP

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    Do you have a multimeter? Voltage test fuse 24 to see whether it gets voltage from the ignition switch and sends voltage to the main relay.
     
  10. civteck

    civteck Respected

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    Get a meter and proceed.. #1 tool in your bag, let us know when your ready.

    Sent from my boujea ass phone
     
  11. SD_760

    SD_760 New Member

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    Ok great I'll swoop one up in the morning
     
  12. SD_760

    SD_760 New Member

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    11.94 volts from one tab of fuse 24 and .29 volts on the other side ? Went back and forth about 4 times same results IMG_3771.JPG IMG_3772.JPG
     
  13. boofoo

    boofoo Respected Registered VIP

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    Nice job.

    Your result unambiguously shows that fuse 24 is blown.

    If you unplug the main relay and then turn key to ON(II), does the fuse blow again?
     
  14. SD_760

    SD_760 New Member

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    No I just put a new one in and both tabs read identical ... nothing has changed though
     
  15. boofoo

    boofoo Respected Registered VIP

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    The wire that runs from the dash fuse box to the main relay or the dash fuse box itself has a short to ground. Fix the short, fix the problem.

    You may have purchased a new ECU prematurely.
     
  16. SD_760

    SD_760 New Member

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    Haha okay well I'm trying to keep the speed up on this project - Build thread in progress but trying to get it running first
     
  17. SD_760

    SD_760 New Member

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    image.jpg What the ... found this sucker tucked away deep and the next one image.jpg
    Also my key ring came with a viper alarm clicker the kid had no idea about an alarm system cuz his aunt gave it to him ...
     
  18. boofoo

    boofoo Respected Registered VIP

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    Only relevant if one of the wires attaches to the dash fuse box or main relay. Do they?
     
  19. SD_760

    SD_760 New Member

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    image.jpg
    Sorry my keyboard stopped working I had to reboot phone. Was wondering if the tab was not properly clamped to the wire if it would be causing an issue but that wire was going into a1
     
    Last edited: Oct 31, 2017
  20. boofoo

    boofoo Respected Registered VIP

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    When you post pictures, state the relevance.
     


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