DTC Detection Logic
WARNING: This page is about a different car, the 2010 Infiniti M35. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
- If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC.
DTC DETECTION LOGIC CHART
| 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. |
|