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D4 flash but no code

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    #1

    D4 flash but no code

    Hola compadres.

    I read the through the entire "ENG: Diagnose a Check Engine Light and S/D4 errors" thread & also did a search but haven't found anybody else asking this question so...

    My 93 has a CEL light and a constantly flashing D4 light when I drive. CEL is on solid, D4 flashing no particular sequence, just on/off forever.

    I jumped the blue connector & read the ECU - it's giving me a 6 (ECT - water temperature sensor) & 15 (Ignition output signal). So that's fine, I'll run those down.

    But...the D4 is not giving me any error code - it stays off. I thought that when the diagnostic connector was jumped, the D4 light itself was supposed to flash a code from the TCU. Any advice on what to check next?
    Tags: code, d4 light, tcu
    #2
    It's possible that the TCU itself is shot. Pull it out, open it up, and check for damage. If you have access to another TCU, try that to see if any codes are thrown.






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      #3
      Make 9 more posts and Ill sell you one

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        #4
        Buying a used one may have similar problems. Some members on here may even be able to repair one for you. I have used an ebay seller ("mandigital", search "9X Accord TCU repair") who repairs TCUs for $75 and provides a lifetime guarantee. He turned both of mine around in a day.
        90 LX 4dr 5 spd 396,014 (sold 1/1/2022) - MRT: http://www.cb7tuner.com/vbb/showthread.php?t=201450
        08 Element LX FWD AT 229,000 - MRT: fleetw00d : 2008 Honda Element LX - CB7Tuner Forums

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