Question about 1990 Honda Civic

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How do u check speed sensor - 1990 Honda Civic

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  • Desmond Rogers
    Desmond Rogers Nov 19, 2009

    how does speed sensor come out of tranny

  • Desmond Rogers
    Desmond Rogers Nov 19, 2009

    yes thank u

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  • Honda Master
  • 77,194 Answers

U need a DVOM (DIGITAL VOLT/OHM METER) u can buy one of these from Radio Shack, here is the test procedure
1st make sure thwe speed sensor drive gear is ok, then do the following
To test the Vehicle Speed Sensor:

  • Remove the Vehicle Speed Sensor from the outside of the transmission.
  • Connect an AC voltmeter set to the 0 to 1 volt scale to the connector pins (a) and (b).
  • Turn the Vehicle Speed Sensor pinion quickly with fingers and measure the voltage across pins (a) and (b). Reading should be approximately 0.5 volts AC.

Posted on Nov 19, 2009

  • yadayada
    yadayada Nov 19, 2009

    it will be held in by a little U shaped clamp and one little bolt that holds the clamp down, then it just pulls out of the trans..

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1. Ensure mainshaft and countershaft speed sensors are installed properly. Disconnect mainshaft speed sensor harness connector. Using a DVOM, measure resistance between sensor terminals.

2. If resistance is not 400-600 ohms, replace mainshaft speed sensor. If resistance is 400-600 ohms, disconnect 25-pin PCM harness connector "B". Check for continuity between ground and 25-pin PCM harness connector "B", terminals No. 15 (Red wire) and No. 14 (White wire).

3. If continuity is present, repair short to ground in Red or White wire between PCM and mainshaft speed sensor. If continuity is not present, reconnect mainshaft speed sensor harness connector. Measure resistance between 25-pin PCM harness connector "B", terminals No. 15 (Red wire) and No. 14 (White wire).

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5. Disconnect mainshaft speed sensor harness connector. Check Red wire for continuity between 25-pin PCM harness connector "B", terminal No. 15 and mainshaft speed sensor harness connector. If continuity is present, go to next step. If continuity is not present, repair open in Red wire between 25-pin PCM harness connector and mainshaft speed sensor
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6. Check White wire for continuity between 25-pin PCM harness connector "B", terminal No. 14 and mainshaft speed sensor harness connector. If continuity is present, check for loose PCM harness connectors. Replace PCM with a known-good unit if necessary. If continuity is not present, repair open in White wire between 25-pin PCM harness connector and mainshaft speed sensor harness connector.

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1. Ensure mainshaft and countershaft speed sensors are installed properly. Disconnect mainshaft speed sensor harness connector. Using a DVOM, measure resistance between sensor terminals.

2. If resistance is not 400-600 ohms, replace mainshaft speed sensor. If resistance is 400-600 ohms, disconnect 25-pin PCM harness connector "B". Check for continuity between ground and 25-pin PCM harness connector "B", terminals No. 15 (Red wire) and No. 14 (White wire).

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