DTC Detection Logic
NOTE:
- If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC DETECTING CONDITION AND POSSIBLE CAUSES
| 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 prewarming up condition. |
|