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Pinpoint Test Db - Speedometer Always Indicates Too High Or Too Low

  1. Remove speed sensor from transmission. Check that correct driven gear is installed for transmission, axle, and tire combination. If gear is incorrect, install correct gear. If gear is correct, go to next step.
  2. Check that correct drive gear is installed on transmission output shaft. If drive gear is correct, replace instrument cluster. If drive gear is incorrect, install correct drive gear.
  3. Unplug connector from vehicle speed sensor, located at left rear of transmission. Measure resistance between sensor terminals. If resistance is 200 - 300 ohms, go to next step. If resistance is not as specified, replace vehicle speed sensor.
  4. Disconnect negative battery cable. Unplug connectors from EIC. Unplug connector from vehicle speed sensor, located at left rear of transmission. Inspect Gray/Black wire for continuity between vehicle speed sensor harness connector and pin No. 31 of EIC harness connector C255. See Figure . Inspect Pink/Orange wire for continuity between vehicle speed sensor harness connector and ground. If continuity exists, replace EIC. Repair appropriate wire if continuity does not exist.
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