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Car Forum / Honda Cars / July 200698 Civic Speedo jumps/check engine light
The other day I was driving home, cruising at a constant speed when suddenly my speedo dropped down to zero and the check engine light came on. After that, the speedo jumped all over the place, past 100 mph, back to zero, totally random, and the transmission started shifting weird, so I figured it wasn't just my speedometer... I unplugged the connector for the Vehicle Speed Sensor, and now the transmission is pretty much back to normal, but of course, I still have my check engine light, and the speedo stays at zero. Today, I installed a new speed sensor, and I get the exact same problem - clunky transmission, crazy speedo... So now I think it must be something else, like wiring or grounds. I've also noticed that occasionally I my dash lights and dome light seem to "throb", but that's been happening since before the speedo problem. I've seem other posts online where others had the same problem, but noone ever said what it was. Should I be looking at my alternator, wires, grounds, or is it possible I got a brand new broken speed sensor? I have no problem checking all that stuff, but hoped somebody would read this that had the same issue and could save me some troubleshooting time. Thanks, Randy > The other day I was driving home, cruising at a constant speed when > suddenly my speedo dropped down to zero and the check engine light came [quoted text clipped - 18 lines] > Thanks, > Randy for ~$60, you can go to sears and get a code reader. your car is obdcII compliant. or you can have the codes read for free by some auto parts stores. once you have the code, you can fix the problem. Jim, I just got the codes read: Speed sensor & both oxygen sensors. That doesn't really help *me* at all. Like I said, I already tried replacing the speed sensor, and the oxygen sensors wouldn't seem to have anything to do with the symptoms I described. -Randy > > The other day I was driving home, cruising at a constant speed when [snip] > > Thanks, > > Randy > > > for ~$60, you can go to sears and get a code reader. your car is obdcII > compliant. or you can have the codes read for free by some auto parts > stores. once you have the code, you can fix the problem. > Jim, > > I just got the codes read: Speed sensor & both oxygen sensors. That > doesn't really help *me* at all. Like I said, I already tried replacing > the speed sensor, and the oxygen sensors wouldn't seem to have anything > to do with the symptoms I described. so what are the codes? i mean the readout numbers, not what you've been told they are. > -Randy > [quoted text clipped - 8 lines] >>compliant. or you can have the codes read for free by some auto parts >>stores. once you have the code, you can fix the problem. >> Jim, >> [quoted text clipped - 5 lines] > so what are the codes? i mean the readout numbers, not what you've been > told they are. itll be interesting to know, but... i remember we had a poster here with the same problem. and i had it too. wasnt there a TSB on the engine wiring harness under the intake manifold? FWIW I had the exact same symptoms with my '96 Civic. It also turned out to be the wiring harness shorting out somewhere under the intake manifold. Thanks for all the great input! SoCalMike, I found a TSB that sorta fits the symptoms: http://downloads.hondatech.info/Auto/Service%20Bulletin/x99-029e.pdf I just followed the TSB and tore into it, but couldn't find any damaged wires. I guess I'll have to keep looking, especially after the reply below. Thanks again! > FWIW I had the exact same symptoms with my '96 Civic. > > It also turned out to be the wiring harness shorting out somewhere > under the intake manifold. > Jim, > > I just got the codes read: Speed sensor & both oxygen sensors. That > doesn't really help *me* at all. Like I said, I already tried replacing > the speed sensor, and the oxygen sensors wouldn't seem to have anything > to do with the symptoms I described. its gotta be the wiring loom under the intake manifold. there is no other answer. id put money down that all those wires are bundled together. > The other day I was driving home, cruising at a constant speed when > suddenly my speedo dropped down to zero and the check engine light came [quoted text clipped - 18 lines] > Thanks, > Randy --------------------------------------------- Even if you aren't covered by the GREAT IGNITION SWITCH RECALL, it might be your problem. Was it changed? Here's the link for the ACCORD version of the recall: http://www.tegger.com/hondafaq/tsb/accord/x02-031e.pdf Google will find you lots more symptoms. 'Curly' > The other day I was driving home, cruising at a constant speed when > suddenly my speedo dropped down to zero and the check engine light came [quoted text clipped - 15 lines] > read this that had the same issue and could save me some > troubleshooting time. my 1998 hatch did the same thing. fixed under warranty. the wiring harness with the VSS got loose and was rubbing against a bracket under the intake manifold, supposedly. i wonder if theres a TSB about it? Have you done the ignition switch replacement? It's a recall job and shouldn't cost anything. Pars > The other day I was driving home, cruising at a constant speed when > suddenly my speedo dropped down to zero and the check engine light came [quoted text clipped - 18 lines] > Thanks, > Randy |
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