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DTC B2277: Detecting Vehicle Submersion: Procedure

CHECK DTC OUTPUT
1. Delete the DTC. Refer to DTC CHECK / CLEAR .
  HINT:
  
  After all DTCs are cleared, check if the trouble occurs again 30 seconds after the engine switch is turned on (IG).
2. Check for DTCs again.
  OK
  
  No DTC is output.
NG → REPLACE POWER SOURCE CONTROL ECU

OK → END