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car speed sensor repair

  • City: Kamloops
  • Listed: 2016-01-13 10:09 pm
  • Expires: 8118 days, 1 hour
Cutaway Jeep sensor
schematicdoor contactreed removedglass reed


Here is an easy fix I stumbled upon when my speed sensor died in my Jeep Cherokee. Most speed sensors I’ve seen are on the transmission and are basically the same. They are very simple, have a rotating magnet which moves a reed relay contact every revolution and the computer simply counts the pulses to compute steed.

The hardest part is taking one apart as they are usually manufactured with a crimping tool so they can’t be opened. Anyway you pry open the tabs and inside is a wheel and a glass reed as shown. Next you go to a Burglar Alarm type of store and buy a larger door contact as shown, take it apart and remove the glass reed contact. Un-solder the old reed relay and attach the replacement. Reassemble unit, (possibly with the help of silicone), and test unit. Connect an ohmmeter to the 2 terminals, and it should pulse as you turn the cable end with a screwdriver.

Ad Reference ID: 39856973b8eb8aea

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  • Listed by: Richard
  • Member Since: 2015-12-08

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