98Civic speedo malfunctioned a bit, now fine, but engine light on
Speedo malfunctioned for a bit, was idle at 0 while driving, then engine light came on. Pulled car over, restarted it, and drove a while, speedo working fine again (although I don't know if it's accurate). But engine light is still on. Is it still safe to drive home and wait 2 days (tomorrow's a public stat holiday) and take it to the mechanic, or should I stop driving altogether? Could the engine light be on due to the speedo or something bigger?
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Depending on the type an year vehicle an the electronics on the car , the instrument cluster could be at fault ! The stepper motor that moves the speedo could be the problem if a GM product ! As far as the speed sensor goes a few other things wouldn't work very well if it were bad an the check engine light would be on more then likely because this is an input to the PCM - engine computer ! The transmission would shift erratically !
The IPC displays the vehicle speed based on the vehicle speed signal from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. The IPC uses the vehicle speed signal circuit from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit exists.
So I would say the instrument cluster is bad !
It sounds like the Speedo cable is going bad remove the cable connector on the side of the transmission and twist the cable and see if the odometer moves, you can also pull out the cable from this end and check the Speedo end, if it's bad it will be rounded off rather than square. If the gear in the transmission is bad you can put the cable into the end of the Speedo gear on the transmission and try turning it if it turns around say a half turn or more then the gear is bad, all you do is pull out the bolt and the small horse shoe clamp and wiggle out the gear and go buy a new one at the dealer or transmission shop, if the cable is bad you can buy a cable kit for $12.00 the gear is about $10.00. The check engine light would come on because the Speedo is malfunctioning and uses the info from the Speedo to input injector pulse width.
This is an electronic speedo, could be several things but probably 1st and easiest thing to try is repalceing the vehicle speed sensor(vss). Also need to know if check engine light is on, and if any other electrical items are malfunctioning.
there would either be a shorted wire or the computer is malfunctioning. The only way to fix this problem is to have a mechanic put a scanner on your car and test it. AUTOZONE DOES IT FREE other wise it's about $40
Try to find the speedo-cable from the firewall down the the
transmission. Usually on auto trannys the speedo head (the signal
generator which is a gear basicly) is located on the top of the tranny,
of course attached to the speedo cable. If it's a 'drive by wire' car
and there's no cable - it will require more investigation.