P1421

P1421 COLD START CONTROL

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






DTC CONFIRMATION PROCEDURE

Step 1-2:

Diagnosis Procedure

Step 1-2:

Step 2 (Continued)-5: