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Code 21

  1. Check connectors to dash harness and front harness. Repair as necessary. If connectors are okay, disconnect instrument panel ECU harness connector.
  2. Check continuity between ground and instrument panel ECU harness-side connector terminal No. 62 (Yellow wire). If continuity is present, replace ETACS-ECU. If continuity is not present, check circuit between ETACS-ECU and ground. Repair as necessary.
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