Nissan GT-R (R35) · Service Manual ENGINE

P1805 BRAKE SWITCH

VR38

P1805

Description


Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed. This signal is used mainly to decrease the engine speed when the vehicle being driven.

DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P1805
 		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

 
 DTC CONFIRMATION PROCEDURE

 
 1.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK STOP LAMP SWITCH CIRCUIT
 
 2.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
 
 3.DETECT MALFUNCTIONING PART
 
 4.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 5.DETECT MALFUNCTIONING PART
 
 6.CHECK STOP LAMP SWITCH
 
 7.CHECK INTERMITTENT INCIDENT

Component Inspection (Stop Lamp Switch)


 
 1.CHECK STOP LAMP SWITCH-I
 
 2.CHECK STOP LAMP SWITCH-II