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Speed Sensor Input Test

  1. Check 10-amp fuse 23 in dash fuse box. Disconnect 3-pin connector from speed sensor, located on right side of engine.
  2. Use an ohmmeter to check continuity between Black wire and ground. If continuity exists, go to next step. If continuity does not exist, check Black wire for an open circuit. Also check for poor ground.
  3. Turn ignition switch to ON position. Use a voltmeter to check voltage between Yellow wire (Yellow/Blue wire on Civic and Civic Del Sol, Black/Yellow wire on Prelude) and ground. If battery voltage is present, go to next step. If battery voltage is not present, check Yellow wire (Yellow/Blue wire on Civic and Civic Del Sol, Black/Yellow wire on Prelude) for an open circuit.
  4. With ignition on, check voltage between Orange wire (Yellow/White wire on Civic and Civic Del Sol) and ground. If voltage is about 5 volts, go to next step. If voltage is not as specified, check Orange wire (Yellow/White wire on Civic and Civic Del Sol) for an open circuit.
  5. If continuity and voltage checks are okay, but speedometer/odometer/trip meter does not operate properly, replace speed sensor.
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