Speedo jumps(improper trans shift)
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Freshman User
Joined: Dec 2002
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Speedo jumps(improper trans shift)
Could someone tell me what the voltage output from the speed sensor on the diff should be? I tested it while increasing speed and it only went to 5 VAC. After I got past 100klms it dropped back to 4.5 volts and the speedo jumps.
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Joined: May 2003
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Pull the sensor out and check for physical damage. Often the ears on the friction plates in the traction lock break off and go around with the ring gear and damage the sensor. Replace it if damaged and check inside the rear end for damage. If you take the cover off check the reluctor ring for damage. Sometimes a tooth or 2 will be damaged or knocked off.
If it doesn't have physical damage check the resistance of the sensor with an ohmmeter, if its more than 1000-1500 ohms it probably is bad.
If it doesn't have physical damage check the resistance of the sensor with an ohmmeter, if its more than 1000-1500 ohms it probably is bad.
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From what I've been told it produces an ac sine wave which should also produce an ac voltage when reading from the sensor itself. It changes to a frequency when it comes from the psom to the pcm.
