lemon-mirror:
Home >> Volvo >> 1993 >> 850 Automatic >> Repair and Diagnosis >> Electrical >> Gauges >> Instrument Panel >> Testing >> Speedometer Test >> 850 (Speedometer Reading Incorrect)

850 (Speedometer Reading Incorrect)

  1. Turn ignition on. Activate diagnostic test mode No. 3. See DIAGNOSTIC TEST MODE NO. 3 under SELF-DIAGNOSTICS. If speedometer needle moves to vertical position, go to next step and check vehicle speed sensor ground circuit. If speedometer is significantly out of vertical position, replace instrument cluster.
  2. Turn ignition off. Raise vehicle and disconnect vehicle speed sensor connector from transmission. See Figure. Connect ohmmeter between sensor connector terminal No. 2 (Yellow/Green 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 4)
  3. If ohmmeter did not indicate zero ohms in step 2), check for an open circuit in Yellow/Green 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.
  4. 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. If resistance is not 1700-1940 ohms, replace vehicle speed sensor.
· About lemon-mirror