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CB7 Cruise Control Not Working

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    #1

    CB7 Cruise Control Not Working

    I'm pretty new to this site so I hope I'm posting in the right section.
    I have a 1992 Accord EX 5 speed, and my cruise control has recently stopped working. The cruise main light is on when the button is pressed, and the green cruise light in the gauge cluster comes on when I press SET, but the cruise control does not actuate. The 7.5a cruise fuse is good. I do have vacuum pressure, no vacuum leaks. It's not the clutch or brake switch because the light in the cluster wouldn't come on if that were the case. I used the troubleshooting section in the Honda service manual to check various pins on the cruise control module connector under the dash, and everything checks out. Not too sure what else to check, besides checking for voltage at the CC actuator connector in the engine bay with the wheels moving, which I guess would rule out an open wire somewhere.
    Last edited by brent24hill; 10-02-2023, 06:53 PM.
    Tags: None
    #2
    Hey

    So that CC unit inside is a giant diaphragm. When they get old they will leak and not hold the "air". The vacuum pulls on one side of the diaphragm and that in turn pulls on that extra throttle cable (or holds it in place).
    So.... see if you can find a way to see if that cable is moving at all.... If that cable is not moving, but you have vacuum, then the diaphragm is broken or the cable is stuck. I guess you could also.... pump some air into it to see if it holds air? or ..... put a vacuum on it and see if the cable moves ...

    no wait... take the cable off on the throttle body side and push / pull on the wire. You should feel the air coming out of the nozzle side (where the vacuum hose attaches / put a balloon on the end ? *shrugs*. ) You get the point here.... need to test that diaphragm out.....inside the CC unit and also make sure that cable can move.

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      #3
      Ok, I will try that as soon as I get a chance. The only thing that puzzles me is that when I took the car to get the timing belt idler pulley replaced (made a whining noise), the cruise control worked just fine on the way there but did not work at all on the way back, and that was all in the same day. Could the shop that worked on it possibly have done something to it while swinging it out of the way?

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        #4
        *shrugs*...sure anything is possible. It could of been waiting to break and just moving it was the last straw. Or it could be fixable. You'll have to look.

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          #5
          Ok. I'll start looking into the diaphragm and testing it. I guess everything so far is pointing towards just replacing the unit, but we'll see. I appreciate the advice!

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            #6
            Likely just the buttons on your pedals that depress the switches. This become deformed over time. If deformed more than .020" or so, cruise will not work. Check the continuity of your pedal switches. The one on the brake is double pole, double throw. Open/cloed and Closed/open depending on if pedal is up or down.

            Here, watch this: https://www.youtube.com/watch?v=n0yJroWv9c4

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              #7
              Make sure they didn't accidentally kink the cable that runs to the cruise control actuator. Since it runs right over the top of the timing belt cover they would have had to move it and may have carelessly draped it at a bad angle. It doesn't take much to kink the cable or the guide sleeve. The diaphragm pulls with a very, very gentle force and any excess resistance in the cable at all will make it not function. Hell, even being too cold (under about 35F) will make my 91's cruise stop working because of the grease in the cable stiffening up.

              I don't have access to my car this week so I can't test this and my memory is fuzzy, but IIRC if you hold the throttle open at the engine you can then push the cruise control cable in and out without too much diaphragm resistance. Might have to actually take the CC unit off the cable. But definitely check that.

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