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Code 31

  1. Disconnect assist-ECU harness connector. Check continuity between ground and assist-ECU harness connector terminal No. 22 (Black wire). See WIRING DIAGRAMS  . If continuity is present, replace assist-ECU. If continuity is not present, go to next step.
  2. Check circuit between ground and assist-ECU. See WIRING DIAGRAMS  . Repair as necessary.
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