Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

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.

      ECM				Voltage
      +		-
      Connector	Terminal	Connector	Terminal
      F13	77	E10	112	Battery voltage

      Fig 1: Checking Voltage Between ECM Harness Connector And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      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 
   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

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

      : INSPECTION END