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Diagnosis Procedure
1.INSPECTION START
Check that the battery negative terminal is not disconnected during ignition switch ON.
Is the inspection result normal?
.
.
 
2.ERASE DTC
  1. Start the engine and let it idle at least 10 seconds.
  2. Turn ignition switch OFF.
  3. Repeat steps 1 and 2 for 4 times.
  4. Erase DTC.
  5. Turn ignition switch OFF and wait at least 10 seconds.
  6. Start the engine and let it idle for 10 seconds.
  7. Check 1st trip DTC.
Is DTC P1603 detected again?
Replace ECM. Refer to Removal & InstallationECM : Removal & Installation.
INSPECTION END
 
3.CHECK ECM POWER SUPPLY AND GROUND CIRCUIT
Check ECM power supply and ground circuit. Refer to Diagnosis ProcedureDTC Diagnosis Procedure.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
4.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Refer to Intermittent IncidentIntermittent Incident.
Is the inspection result normal?
.
Repair or replace error-detected parts.
 
5.PERFORM DTC CONFIRMATION PROCEDURE
  1. Turn ignition switch ON.
  2. Erase DTC.
  3. Perform DTC confirmation procedure. Refer to DTC Description.
Is the DTC P1603 detected again?
Replace ECM. Refer to Removal & InstallationECM : Removal & Installation.
INSPECTION END