Speed Sensor Test (929)

1991 Mazda 626 DX, AutomaticSECTION Speed Sensor Test (929)
  1. Raise and support drive axle so wheels can be turned by hand. Disconnect control unit wire connector. Control unit is located under right rear seat. Connect ohmmeter between terminal "H" of wire connector and ground. See Figure.
  2. Ohmmeter should fluctuate continuity and infinity as wheels are manually rotated. If no continuity registers, inspect wire harness for short or open circuit. If wire harness is okay, replace speed sensor and retest system.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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