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