Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM-ENGINE CONTROL SYSTEM- ".

1. CHECK GROUND CONNECTION-I
   1. Turn ignition switch OFF.
   2. Check ground connection E9. Refer to Ground Inspection in "CIRCUIT INSPECTION ".

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace ground connection.

2. CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
   1. Disconnect ECM harness connector.
   2. Check the continuity between ECM harness connector and ground.

      ECM		Ground	Continuity
      Connector	Terminal
      F14	12	Ground	Existed
      	16
      E10	107
      	108
      	111
      	112

   3. Also check harness for short to power.

      is the inspection result normal? 

      YES: GO TO  4.

      NO: GO TO 3.

3. DETECT MALFUNCTIONING PART

   Check the following.

   • Harness connectors E11, F2
   • Harness for open or short between ECM and ground

     : Repair open circuit, short to power in harness or connectors.

4. CHECK ECM POWER SUPPLY CIRCUIT-I
   1. Reconnect ECM harness connector.
   2. Turn ignition switch OFF and then ON.
   3. Check the voltage between ECM harness connectors.

      ECM			Voltage
      Connector	+	-
      	Terminal	Terminal
      E10	93	112	Battery voltage

      Is the inspection result normal? 

      YES: GO TO  6.

      NO: GO TO 5.

      Fig 1: Checking Voltage Between ECM Harness Connector Terminals

      Courtesy of NISSAN NORTH AMERICA, INC.
5. DETECT MALFUNCTIONING PART

   Check the following.

   • IPDM E/R connector E18
   • 10 A fuse (No. 35)
   • Harness for open or short between ECM and fuse

     : Repair open circuit, short to ground or short to power in harness or connectors.

6. CHECK ECM POWER SUPPLY CIRCUIT-II
   1. Turn ignition switch OFF and wait at least 10 seconds.
   2. Check the voltage between ECM harness connectors.

      ECM			Voltage
      Connector	+	-
      	Terminal	Terminal
      E10	105	112	After turning ignition switch OFF, battery voltage will exist for a few seconds, then drop to approximately 0 V.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: GO TO  9.

      Fig 2: Checking Voltage Between ECM Harness Connectors Terminals

      Courtesy of NISSAN NORTH AMERICA, INC.
7. CHECK ECM POWER SUPPLY CIRCUIT-III
   1. Turn ignition switch ON.
   2. Check the voltage between IPDM E/R harness connector and ground.

      IPDM E/R		Ground	Voltage
      Connector	Terminal
      F10	49	Ground	Battery voltage
      	53

      Is the inspection result normal? 

      YES: GO TO 8.

      NO: Replace IPDM E/R. Refer to REMOVAL AND INSTALLATION .

      Fig 3: Checking Voltage Between IPDM E/R Harness Connector And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.
8. CHECK INTERMITTENT INCIDENT

   Refer to "INTERMITTENT INCIDENT ".

   : INSPECTION END

9. CHECK ECM POWER SUPPLY CIRCUIT-IV
   1. Turn ignition switch OFF and wait at least 10 seconds.
   2. Check the voltage between ECM harness connectors.

      ECM				Voltage
      +		-
      Connector	Terminal	Connector	Terminal
      F14	24	E10	112	Battery voltage

      Is the inspection result normal? 

      YES: GO TO  12.

      NO: GO TO 10.

      Fig 4: Checking Voltage Between ECM Harness Connectors

      Courtesy of NISSAN NORTH AMERICA, INC.
10. CHECK ECM POWER SUPPLY CIRCUIT-V
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

       ECM		IPDM E/R		Continuity
       Connector	Terminal	Connector	Terminal
       F14	24	F10	69	Existed

    4. Also check harness for short to ground and short to power.

       Is the inspection result normal? 

       YES: GO TO 11.

       NO: Repair open circuit, short to ground or short to power in harness or connectors.

11. CHECK 15 A FUSE
    1. Disconnect 15 A fuse (No. 42) from IPDM E/R.
    2. Check 15 A fuse.

       Is the inspection result normal? 

       YES: GO TO  14.

       NO: Replace 15 A fuse.

12. CHECK ECM POWER SUPPLY CIRCUIT-VI
    1. Disconnect ECM harness connector.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between ECM harness connector and IPDM E/R harness connector.

       ECM		IPDM E/R		Continuity
       Connector	Terminal	Connector	Terminal
       E10	105	E18	10	Existed

    4. Also check harness for short to ground and short to power.

       Is the inspection result normal? 

       YES: GO TO  14.

       NO: GO TO 13.

13. DETECT MALFUNCTIONING PART

    Check the following.

    • Junction block connectors E44, E45
    • Harness for open or short between ECM and IPDM E/R

      : Repair open circuit, short to ground or short to power in harness or connectors.

14. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

    YES: Replace IPDM E/R. Refer to REMOVAL AND INSTALLATION .

    NO: Repair or replace harness or connectors.