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On Board Diagnosis Logic: Notes

The MIL will not light up for this self-diagnosis. 

DTC DETECTING CONDITION CHART

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P1805
1805
Brake switch A brake switch signal is not sent to ECM for extremely long time while the vehicle is driving.
  • Harness or connectors (Stop lamp switch circuit is open or shorted.)
  • Stop lamp switch