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C70, S70 & V70 (Speedometer Reading Incorrect)

  1. Turn ignition off. Raise vehicle and disconnect vehicle speed sensor connector from transmission. See Figure. Connect ohmmeter between sensor connector terminal No. 2 (Green/Yellow wire) and ground. If ohmmeter does not indicate zero ohms, go to next step. If ohmmeter indicates zero ohms, check vehicle speed sensor mounting. If sensor is mounted incorrectly, distance to toothed wheel may be too far. If sensor mounting is okay, go to step  3.
  2. Check for an open circuit in Green/Yellow wire between vehicle speed sensor connector terminal No. 2 and instrument cluster 30-pin connector terminal No. 2. If circuit is okay, check for an open ground in circuit between instrument cluster 30-pin connector terminal No. 15 (Brown wire) and ground.
  3. Turn ignition off. Raise and support vehicle. Disconnect vehicle speed sensor connector at transmission. See Figure. Connect an ohmmeter between sensor terminals. If resistance is 1700-1940 ohms, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If resistance is not 1700-1940 ohms, replace vehicle speed sensor.
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