For California

P0603 ECM POWER SUPPLY





Description





Battery voltage is supplied to the ECM even when the ignition switch is turned OFF for the ECM memory function of the DTC memory, the air-fuel ratio feedback compensation value memory, the idle air volume learning value memory, etc.




DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following 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 and wait at least 10 seconds.
2. Turn ignition switch OFF and wait at least 5 minutes
3. Turn ignition switch ON and 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 For California.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK ECM POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.





3. Check the voltage between ECM harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - GO TO 2.
2.DETECT MALFUNCTIONING PART
Check the following.
- 15 A fuse (No. 42)
- IPDM E/R harness connector F10
- Harness for open or short between ECM and battery
- Repair or replace harness or connectors.
3.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace harness or connectors.
4.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
1. Turn ignition switch ON.
2. Select "SELF-DIAG RESULTS" mode with CONSULT-III.
3. Touch "ERASE".
4. Perform DTC CONFIRMATION PROCEDURE.
See For California.
With GST
1. Turn ignition switch ON.
2. Select Service $04 with GST.
3. Perform DTC CONFIRMATION PROCEDURE.
See For California.
Is the 1st trip DTC P0603 displayed again?
YES - GO TO 5.
NO - INSPECTION END
5.REPLACE ECM
1. Replace ECM.
2. Go to For California.
- INSPECTION END