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EC-340 < COMPONENT DIAGNOSIS > [QR25DE] P1421 COLD START CONTROL P1421 COLD START CONTROL Description INFOID:0000000004211581 ECM controls ignition timing and engine speed when engine is started with prewarming up condition. This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions. DTC Logic INFOID:0000000004211582 DTC DETECTION LOGIC NOTE: If DTC P1421 is displayed with other DTC, first perform the trouble diagnosis for other DTC. DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct- ing the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 11V at idle. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE With CONSULT-III 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Set selector lever to P position. 3. Turn ignition switch ON. 4. Make sure that air conditioner switch and electric load switches (lights, heater fan, rear window defogger) are OFF. 5. Select “DATA MONITOR” mode with CONSULT-III. 6. Check that the “COOLAN TEMP/S” indication is between 4 °C (39°F) and 36°C (97°F). If “COOLAN TEMP/S” indication is within the specified value, go to the following step. If “COOLAN TEMP/S” indication is out of the specified value, cool engine down or warm engine up and go to step 1. 7. Confirm that the “SOC” indication in “DATA MONITOR” mode of “HYBRID SYSTEM” is between 40 and 70 %. 8. Turn ignition switch ON (READY) and wait for 70 seconds. 9. Check 1st trip DTC. With GST 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Set selector lever to P position. 3. Turn ignition switch ON. 4. Make sure that air conditioner switch and electric load switches (lights, heater fan, rear window defogger) are OFF. 5. Check engine coolant temperature with Service $01 of GST and confirm that the indication is between 4 °C (39°F) and 36°C (97°F). If the indication is within the specified value, go to the following step. If the indication is out of the specified value, cool engine down or warm engine up and go to step 1. 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 |