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.
   VOLTAGE REFERENCE CHART
   
   

   ECM		Ground	Voltage
   Connector	Terminal
   F8	77	Ground	Battery voltage

   Is the inspection result normal? 

   YES: Go to  3.

   NO: Go to 2.

2. DETECT MALFUNCTIONING PART

   Check the following.

   • Harness connectors E8, F122
   • 20 A fuse (No. 62)
   • IPDM E/R harness connector E15
   • 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
   1. Erase DTC.
   2. Perform DTC CONFIRMATION PROCEDURE.

   See "DTC LOGIC ".

   Is the 1st trip DTC P0603 displayed again? 

   YES: Go to 5.

   NO: INSPECTION END

5. REPLACE ECM

1. Replace ECM.
2. Go to "ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT : SPECIAL REPAIR REQUIREMENT ".

INSPECTION END