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Where's the ECU located on a 90 CRX DX?

Discussion in 'Civic and CRX - EW' started by 90CRXDX, Sep 26, 2006.

  1. 90CRXDX

    90CRXDX New Member

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    Sep 25, 2006
    Two questions:

    1. Where's the ECU located on my 90 Honda CRX DX? I've searched several forums, I have the codes and how to read them, but nowhere have I found where it is located on a CRX. One site said it was under the passenger seat for a Civic, but there's nothing there. There's a blue box under the driver seat but I see no LEDs. I also have a little blue 2-wire connector under the glove box which was mentioned to jumper, but those instructions were for later models.

    2. The catch is -- the check engine light comes on only while driving. The performance does not seem to be affected. However, all of the instructions I've read say to check the codes in the ON position without the engine running. Unfortunately, when I turn the car off and back on, the light goes out. I have to drive it for 5-10 minutes again before it comes back on. Any suggestions on how to troubleshoot while running?

  2. jlicrx

    jlicrx Senior Member

    Likes Received:
    Jun 5, 2003
    Colorado Springs
    it is located in the passenger side footwell - pull back carpet and you will see it
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