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850 (Tachometer Does Not Operate)

  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. Check ignition ECU by reactivating test mode No. 3 on diagnostic unit "A", but placing socket in terminal No. 6. See Figure. If tachometer needle again goes to vertical position, tachometer circuit is okay.
  2. If tachometer does not operate at all, check for short circuit to ground in White/Black wire between 30-pin connector terminal A11 and ignition ECU connector "B", terminal B29. See Figure. If wiring is okay, replace instrument cluster.
  3. If tachometer does not operate in diagnostic test mode No. 3, check for open circuit in White/Black wire between instrument cluster 30-pin connector terminal A11 and ignition ECU connector "B" terminal B29.
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