Nissan GT-R (R35) · Service Manual ENGINE

P1421 COLD START CONTROL

VR38

P1421

Description


ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.

DTC Logic

 
 DTC DETECTION LOGIC

NOTE：
  • If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.


DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P1421
 		Cold start emission reduction strategy monitoring
 		ECM does not control ignition timing and engine idle speed properly when engine is started with pre-warming up condition.
  • Lack of intake air volume
  • Fuel injection system
  • ECM

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.PERFORM IDLE AIR VOLUME LEARNING
 
 2.CHECK Intake system
 
 3.CHECK FUEL INJECTION SYSTEM FUNCTION
 
 4.PERFORM DTC CONFIRMATION PROCEDURE
 
 5.REPLACE ECM