Diagnosis Procedure

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the voltage between ECM harness connector terminals under the following conditions.

   ECM				Voltage
   +		-
   Connector	Terminal	Connector	Terminal
   F102	93	M107	128	Battery voltage

   Is the inspection result normal? 

   YES: GO TO  3.

   NO: GO TO 2.

Check the following.

• Harness connectors E3, F1
• 15 A fuse (No. 50)
• IPDM E/R harness connector E7
• Harness for open or short between ECM and battery

  : Repair or replace harness or connectors.

Refer to "INTERMITTENT INCIDENT ".

Is the inspection result normal? 

YES: GO TO 4.

NO: Repair or replace harness or connectors.

1. Turn ignition switch ON.
2. Erase DTC.
3. Perform DTC Confirmation Procedure.

   See "DTC LOGIC ".

   Is the 1st trip DTC P0603 displayed again? 

   YES: GO TO 5.

   NO: INSPECTION END

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

   : INSPECTION END