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Attempting to Diagnose CEL Reveals Nothing

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    #1

    Attempting to Diagnose CEL Reveals Nothing

    Hello everyone. I'm a new poster, but I've been carefully watching what's been going on here for a few weeks. I've made great use of a lot of the valuable knowledge here on this site, but now I feel I should ask this question.

    I have a 92 EX Auto. The CEL has been on since I bought the car three years ago. I've been told by multiple people that it's an O2 sensor code. Twice have I replaced the sensor (the one in the exhaust near the back, I think it is?) and twice, the CEL was reset. It always comes back.

    Yesterday, I thought that I would check the code (my first time checking the code myself). I connected the two wires on the blue connector with a paperclip and turned the car to ACC. Nothing happened. The D4 light did not blink at all. However, I know there's continuity through the paperclip because I got a nice shock when I went to touch the paperclip to remove it.

    My question is: has anyone here heard of that happening? If so, what was the problem in the past? I have not yet tried to trace the wire to the ECU to see if there is a problem with the connector. That is next.

    Any help here would be awesome.

    Edit: (oh, also I have both pulled the ECU / Backup fuses for 5 minutes, and another time I pulled the negative battery terminal for over an hour. CEL's still on.)
    Tags: None
    #2
    Turn the car on with the paperclip on the connector, That's how I got my codes.
    1993 Accord EX
    2011 Subaru STi

    Comment

      #3
      Originally posted by tonymontana1204 View Post
      Turn the car on with the paperclip on the connector, That's how I got my codes.
      I thought you don't want to turn the car on all of the way or you'd damage something. If that's the case that all you have to do is turn the car on all of the way, I'm going to hate myself for not reading enough!

      Comment

        #4
        Hmm?

        Sooooo....what's the scoop? Do I turn the car on all of the way, or will I fry something?

        Comment

          #5
          If the check engine light is not flashing at all, maybe you have a bad ECU.

          Try one from a JY or a friend.

          Comment

            #6
            You can't get the code on ACC position , you have to put it on the ignition position where all the lights on the dash does the pre-flight check.

            No wonder you can't get anything.

            1993 Honda Accord LX 2004-2009
            1996 Honda Civic LX 2009-2012
            2012 Kia Optima LX 2012-2013
            2010 Honda Accord EX-L V6 2013-2018
            2007 Honda Fit Sport 2017-2017
            2018 Honda Accord EX-L 2.0T 2018-20XX





            Comment

              #7
              Originally posted by Cakeboy View Post
              You can't get the code on ACC position , you have to put it on the ignition position where all the lights on the dash does the pre-flight check.

              No wonder you can't get anything.
              I've tried every position short of fully starting the car. I'm sorry, I should have been more clear with that.

              Comment

                #8
                Originally posted by BBuncky2 View Post
                I've tried every position short of fully starting the car. I'm sorry, I should have been more clear with that.
                Try a smaller paper clip.
                The first time I tried, I was using one that was too big.
                But, the smaller one worked.



                Just a suggestion.

                1999 BMW M3
                2001 Honda CR-V SE RT4WD
                2005 Chevrolet Tahoe Z71
                2015 Suzuki V-Strom 650

                Comment

                  #9
                  Originally posted by BBuncky2 View Post
                  I've tried every position short of fully starting the car. I'm sorry, I should have been more clear with that.
                  oh ok my bad.

                  Keep trying , if nothing really comes up then it's a faulty ECU.

                  1993 Honda Accord LX 2004-2009
                  1996 Honda Civic LX 2009-2012
                  2012 Kia Optima LX 2012-2013
                  2010 Honda Accord EX-L V6 2013-2018
                  2007 Honda Fit Sport 2017-2017
                  2018 Honda Accord EX-L 2.0T 2018-20XX





                  Comment

                    #10
                    When I did it and I put the key where all the lights are on the light didn't flash. The second I turned the car on it started flashing.
                    1993 Accord EX
                    2011 Subaru STi

                    Comment

                      #11
                      reset the ECU in the fuse box and wait for the CEL light to come back on. Then check it. Take note on how long it takes for the CEL light to come back on... I am thinking a bad ECU will turn that CEL light fairly quickly where as an O2 sensor might take a few minutes until the car is in a closed-loop situation after it warms up.
                      AD5OS
                      FOLDING@home

                      Comment

                        #12
                        Originally posted by AD5OS View Post
                        reset the ECU in the fuse box and wait for the CEL light to come back on. Then check it. Take note on how long it takes for the CEL light to come back on... I am thinking a bad ECU will turn that CEL light fairly quickly where as an O2 sensor might take a few minutes until the car is in a closed-loop situation after it warms up.

                        Ah. If that's the case, then crap. I have had SOME trouble finding a P16 (I think it's a P16 in the EX?) replacement for my car in the past. I have never seen my CEL take longer than a few seconds to turn on.

                        *sigh*...I'll check it out after work today.

                        Comment

                          #13
                          Originally posted by EJX_Michael View Post
                          If the check engine light is not flashing at all, maybe you have a bad ECU.

                          Try one from a JY or a friend.
                          I WISH I knew someone personally with a CB7! That would be sweet! We could share knowledge and help each other work on the cars.

                          Comment

                            #14
                            Originally posted by BBuncky2 View Post
                            Ah. If that's the case, then crap. I have had SOME trouble finding a P16 (I think it's a P16 in the EX?) replacement for my car in the past. I have never seen my CEL take longer than a few seconds to turn on.

                            *sigh*...I'll check it out after work today.
                            EX ECU is a PT6.
                            1993 Accord EX
                            2011 Subaru STi

                            Comment

                              #15
                              how do u read them obd 1 codes i tried counting the blinks then i got lost cuz it went from super fast to fast then slow i know whats wrong in my one accord it has a hole in #3 piston but my ex i donno help plzz

                              Comment

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