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Intermittent CEL on bumps

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    #1

    Intermittent CEL on bumps

    Hey guys, recently my cb has been throwing up a CEL intermittently. When I turn off the car, it doesn't reappear immediately but comes back after some time (a few days) usually when driving over some harsher bumps. Anyone got a clue?
    Tags: cel, computer, sensor
    #2
    What is the CEL for? I would start there and find possible solutions, maybe a plug or connector is loose and gets jiggled when going over bumps.
    [url=https://flic.kr/p/2hFNC7Z]

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      #3
      I'm not sure, how can I find out?

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        #4
        There are some ECM that have a small round window with a light that flashes, you simply count the flashes with pauses for double digit numbers. The secong option is to jump the blue plug under the kickpanel plastic using either a female connector setup on a small wire, paperclip or a screwdriver and count the flashes from the check engine light on the dash using the same method as above.

        giving you a link for the second method and correct way of reading the flashing
        https://youtu.be/bnpCqbhBDdQ
        Last edited by Crankshaft; 05-07-2017, 11:33 PM.
        [url=https://flic.kr/p/2hFNC7Z]

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          #5
          The method and codes can be found in the thread at the top of this section marked "READ HERE FIRST" (nobody ever does, despite that...)

          I'm quite certain that the culprit is a loose wire somewhere. Pull the code and it should point you right at the problem. It COULD be a loose connection in the harness going to the ECU as well (or even a loose pin in the ECU.) Regardless, this shouldn't be too difficult to track down.






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            #6
            Thanks for the tips @deevergote @crankshaft I'm relatively new to this site even though I've been a member for a year now. My cb has basically stayed stock and worry-free since I bought it a year ago, but now I've got some opportunities to learn and modify so I'm all over them. Did I mention I'm an electrical systems noob?

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              #7
              I've been working on CB7s for 15+ years now, and I'm still an electrical systems noob!

              Pull those codes (it's REALLY easy), and we can narrow it down. Then, if it's not a legitimately faulty part, inspect the wires going to the ECU and the part in question for damage. If no obvious damage is seen, it might be time to learn how to use a multimeter.






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