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 ON.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- 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 steps 2 and 3 for five times.
5. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Erase DTC. Refer to "SELF-DIAGNOSTIC RESULTS MODE", "How to Erase Self diagnostic Results" in EC-103, "On Board Diagnosis Function" (Without CONSULT-III) or CONSULT-III Function ECM (With
CONSULT-III).
3. 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.
2. Perform Special Repair Requirement.
- INSPECTION END