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I have a 1996 Toyota Ipsum, the speedometer and rev counter sometimes run wild and it disenganges gears. What can I do to fix the problem of the speed sensor?

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Sounds very much like a problem I have experienced on and off for a couple of years. If your rev and speedo gauges drop dead, your o/d light flashes and your auto gearbox doesn't like to change through the gears, then the odometer pcb has a failed chip. You can pull it apart and try to resolder the loose chip back on. But be warned this is very delicate job (more suited for repair shop) you could end up flooding other chips with solder (as i did). It can be changed out with one from the wreckers but will have to be re-set to your ks/milage. One solution at this stage, if re-soldering is your option, you can also swap your eeprom chip from your old odometer pcb to your new/used pcb from the wreckers. This eeprom carries all the historical ks/milage used. See some info on tachosoft.com (eeprom info) and info from toyota forums on speedo/rev gauges (pcb failure) In a nut shell, this pcb odometer problem kills the feed back signal back to the o/d and gearbox speed sensors etc and so the gearbox doesn't know when to change through the gears.

Posted on Apr 30, 2013

  • charles mussa
    charles mussa Mar 11, 2014

    this is exact problem am facing and surely wil try to check the odometer pcb. whats the meaning of pcb?

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Not to sure, but i think its cable. Loosen the nut that holds the cable to the speedo drive on the gearbox. check if the inner cable is broken.

Regards
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Sounds very much like a problem I have experienced on and off for a couple of years. If your rev and speedo gauges drop dead, your o/d light flashes and your auto gearbox doesn't like to change through the gears, then the odometer pcb has a failed chip. You can pull it apart and try to resolder the loose chip back on. But be warned this is very delicate job (more suited for repair shop) you could end up flooding other chips with solder (as i did). It can be changed out with one from the wreckers but will have to be re-set to your ks/milage. One solution at this stage, if re-soldering is your option, you can also swap your eeprom chip from your old odometer pcb to your new/used pcb from the wreckers. This eeprom carries all the historical ks/milage used. See some info on tachosoft.com (eeprom info) and info from toyota forums on speedo/rev gauges (pcb failure)

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