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DTC B2277: Detecting Vehicle Submersion: Procedure

CHECK WHETHER DTC OUTPUT RECURS
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check whether DTC B2277 is output 30 seconds or more after the engine switch is turned on (IG).
  OK
  
  No DTC is output.
NG → REPLACE MAIN BODY ECU

OK → See step 2
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING