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Vehicle Speed Sensor (VSS)

  1. Read measured value block display group 001. See FUNCTION MODE 08: READING MEASURED VALUE BLOCK  under SELF-DIAGNOSTIC SYSTEM. Road test vehicle. If vehicle speed is indicated on scan tool, but not on instrument cluster, replace instrument cluster. If vehicle speed is not indicated on scan tool, go to next step.
  2. Remove instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Turn ignition on. Measure resistance between instrument cluster Blue, 32-pin harness connector terminals No. 28 (Green/Red wire) and No. 9 (Brown wire).
  3. Roll vehicle forward and back a minimum distance of 4 ft. (1.2 m) each way. Resistance should alternate from zero ohms to infinity. If resistance is not as specified, check vehicle speed sensor circuits. See WIRING DIAGRAMS  . If circuits are okay, replace vehicle speed sensor.
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