Question about 1998 Mazda Protege

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1998 Mazda Protege 1.5L Vechile Speed sensor problems.

Change the oil in my car. Took it for a test drive and found that the speedometer, odometer does not work. The over drive light flashes on and off. The check engine light came on. I had the code scanned at auto zone and it said vechile speed senor was bad. The dealer wanted $250.00 for a new one. I went to a upick junk yard and bought on for $8.10 out of a 97 Protege. I pulled the old sensor and ohmed and got about 350 ohms. I held up to a drill chuck and it does generate AC pulses. I'm start ohming the wires at the computer. Am I missing something? Fuses are all good. The Vechile speed sensor is on the automatic transmission and is a 2 wire senors (red and white wire)

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Your missing a repair manual that shows the computer circuits for the whole car--a scan doesnt always tell u the complete solution-maybe git onother--the instrument cluster may be failin or u hav some grounding issue

Posted on May 15, 2010

  • dalebrichard May 20, 2010

    Czaa the repair manual is how I tracked it down. There is a two wire circuit from the speed sensor to the computer. I have replaced the wires with a twisted pair. I have found a spec. that says the vechile speed senor is good at 350 ohms. I have taken it for a test drive and the check engine light is now out and the over drive light does not flash any more. The only thing left is the wiring to the speedometer and the speedometer itself. I have to have mazda hook up the navistar tool to it and type in a code to test the speedometer it's a 50.00 test. This will hopefully prove whats wrong.



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