P1423

P1423, P1424 COLD START CONTROL

Description

ECM controls fuel injection timing and fuel injection quantity when engine is started with the engine cold.
This control promotes the activation of three way catalyst by heating the catalyst and reduces emissions.


DTC Logic


DTC DETECTION LOGIC

NOTE:
-If DTC P1423 or P1424 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 procedure before conducting 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.
- GO TO 2.

2. PERFORM DTC CONFIRMATION PROCEDURE

WITH CONSULT
1.Turn ignition switch OFF and wait at least 10 seconds.
2.Turn ignition switch ON.
3.Select "DATA MONITOR" mode of "ENGINE" using CONSULT.
4.Check that "COOLAN TEMP/S".
-If it is between 5�C (41�F) and 40�C (104�F) go to the following steps.
-If it is below 5�C (41�F) warm engine up to more than 5�C (41�F) and retry from step 1.
-If it is above 40�C (104�F) cool engine down to less than 40�C (104�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" above.
Is 1st trip DTC detected?
YES- Proceed to .
NO- INSPECTION END


Diagnosis Procedure


1. INSPECTION START

1.Turn ignition switch ON.
2.Erase DTC.
3.Perform DTC confirmation procedure. .
4.Check 1st trip DTC.
Is the 1st trip DTC P1423 or P1424 displayed again?
YES- Replace ECM. Service and Repair.
NO- INSPECTION END