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EC-374 < COMPONENT DIAGNOSIS > [VQ35HR] P1421 COLD START CONTROL P1421 COLD START CONTROL Description INFOID:0000000003133543 ECM controls ignition timing and engine idle speed when engine is started with pre-warming up condition. DTC Logic INFOID:0000000003133544 DTC DETECTION LOGIC NOTE: DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT-III 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Select “DATA MONITOR” mode with CONSULT-III. 4. Check the indication of “COOLAN TEMP/S”. ° C (39 ° F) and 36 ° C (97 ° F), go to the following steps. If it is below 4 ° C (39 ° F), warm engine up to more than 4 ° C (39 ° F) and retry from step 1. If it is above 36 ° C (97 ° F), cool engine down to less than 36 ° C (97 ° F) and retry from step 1. 5. Start engine and let it idle for 5 minutes. 6. Check 1st trip DTC. With GST Follow the procedure “With CONSULT-III” above. Is 1st trip DTC detected? YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000003133545 1. PERFORM IDLE AIR VOLUME LEARNING Perform EC-18, "IDLE AIR VOLUME LEARNING : Special Repair Requirement" Is Idle Air Volume Learning carried out successfully? YES >> GO TO 2. NO >> Follow the instruction of Idle Air Volume Learning. 2. CHECK INTAKE SYSTEM Check for the cause of intake air volume lacking. Refer to the following. DTC No. Trouble diagnosis name DTC detecting condition Possible cause P1421 Cold start emission reduction ECM does not control ignition timing and engine • Lack of intake air volume |