Nissan GT-R (R35) · Service Manual ENGINE

P0603 ECM POWER SUPPLY

VR38

P0603

Description


Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.

JMBIA0057ZZ.JPG

DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P0603
 		ECM power supply circuit
 		ECM backup RAM system does not function properly.
  • Harness or connectors
    [ECM power supply (backup) circuit is open or shorted.]
  • ECM

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK ECM POWER SUPPLY
 
 2.DETECT MALFUNCTIONING PART
 
 3.CHECK INTERMITTENT INCIDENT
 
 4.PERFORM DTC CONFIRMATION PROCEDURE
 
 5.REPLACE ECM