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850 (Tachometer Shows Incorrect Value)

  1. Turn ignition on. Activate diagnostic test mode No. 3. See DIAGNOSTIC TEST MODE NO. 3 under SELF-DIAGNOSTICS. Tachometer needle should go to vertical position. If tachometer needle significantly varies from vertical position, check ignition ECU by activating test mode No. 3 on diagnostic unit "A", but placing socket in terminal No. 6. See Figure. If no fault is found in ignition ECU, replace instrument cluster. If tachometer needle goes to vertical position, go to next step.
  2. Check ground circuit wiring between instrument cluster connector 30-pin connector terminal A15 (Brown wire) and ground. If ground circuit is okay, replace instrument cluster.
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