P0603

P0603 ECM POWER SUPPLY

Description






ECM has the memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the Idle Air Volume Learning value memory, etc. even when the ignition switch is turned OFF.


DTC Logic


DTC DETECTION LOGIC







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

1.Turn ignition switch ON wait at least 10 seconds.
2.Turn ignition switch OFF and wait at least 5 minutes
3.Turn ignition switch ON, wait at least 10 seconds.
4.Repeat step 2 and 3 for five times.
5.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. INSPECTION START

1.Erase DTC.
2.Perform DTC CONFIRMATION PROCEDURE.
See "DTC Logic" .
Is the 1st trip DTC P0603 displayed again?
YES- GO TO 2.
NO- INSPECTION END

2. REPLACE ECM

1.Replace ECM. Refer to "Removal and Installation" Removal And Installation.
2.Perform "Work Procedure" Work Procedure.
- INSPECTION END