Diagnosis Procedure

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

1. CHECK COOLING FAN RELAY POWER SUPPLY CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect cooling fan relays-2, -3.
   3. Turn ignition switch ON.
   4. Check the voltage between cooling fan relays-2, -3 harness connectors and ground.

      Cooling fan relay		Ground	Voltage
      Connector	Terminal
      E42 (cooling fan relay-2)	2	Ground	Battery voltage
      	5
      E43 (cooling fan relay-3)	2
      	5

      Fig 1: Checking Voltage Between Cooling Fan Relays -2, -3 Harness Connectors 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.

   • 10 A fuse (No. 33)
   • 40 A fusible link (letter K)
   • Joint connector-E01 E1
   • IPDM E/R harness connector E18
   • Junction block connectors E44, E48
   • Harness for open or short between cooling fan relay-2 and battery
   • Harness for open or short between cooling fan relay-3 and battery
   • Harness for open or short between cooling fan relay-2 and IPDM E/R
   • Harness for open or short between cooling fan relay-3 and IPDM E/R

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

3. CHECK COOLING FAN RELAY OUTPUT SIGNAL CIRCUIT
   1. Turn ignition switch OFF.
   2. Disconnect IPDM E/R harness connectors.
   3. Check the continuity between cooling fan relay-2, -3 harness connectors and IPDM E/R harness connector.

      Cooling fan relay		IPDM E/R		Continuity
      Connector	Terminal	Connector	Terminal
      E42 (cooling fan relay-2)	1	E17	42	Existed
      E43 (cooling fan relay-3)	1	E18	34

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

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

4. DETECT MALFUNCTIONING PART

   Check the following.

   • Junction block connectors E47, E48
   • Harness for open or short between cooling fan relay-2 and IPDM E/R
   • Harness for open or short between cooling fan relay-3 and IPDM E/R

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

5. CHECK COOLING FAN MOTOR POWER SUPPLY CIRCUIT
   1. Disconnect cooling fan motor-1 harness connector.
   2. Check the voltage between cooling fan motor-1 harness connector and ground.

      Cooling fan motor-1		Ground	Voltage
      Connector	Terminal
      E220	1	Ground	Battery voltage
      	2

      Fig 2: Checking Voltage Between Cooling Fan Motor-1 Terminals 1, 2 And Ground

      Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

6. DETECT MALFUNCTIONING PART

   Check the following.

   • 40 A fusible link (letter M)
   • Harness connector E12, E203
   • Harness for open or short between cooling fan motor-1 and battery

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

7. CHECK COOLING FAN MOTOR CIRCUIT-I
   1. Disconnect cooling fan motor-2 harness connector.
   2. Check the continuity between cooling fan relay-2, -3 harness connectors and cooling fan motor -1, -2 harness connectors.

      Cooling fan relay		Cooling fan motor		Continuity
      Connector	Terminal	Connector	Terminal
      E42 (cooling fan relay-2)	3	E221 (Cooling fan motor-2)	2	Existed
      	7	E220 (Cooling fan motor-1)	3
      E43 (cooling fan relay-3)	3	E221 (Cooling fan motor-2)	1
      	7	E220 (Cooling fan motor-1)	4

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

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

8. DETECT MALFUNCTIONING PART

   Check the following.

   • Joint connector-E02 E20
   • Harness connector E12, E203
   • Harness for open or short between cooling fan motor-1 and cooling fan relay-2
   • Harness for open or short between cooling fan motor-1 and cooling fan relay-3
   • Harness for open or short between cooling fan motor-2 and cooling fan relay-2
   • Harness for open or short between cooling fan motor-2 and cooling fan relay-3

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

9. CHECK COOLING FAN MOTOR CIRCUIT-II
   1. Check the continuity between IPDM E/R harness connector and cooling fan motor -1, -2 harness connector.

      IPDM E/R		Cooling fan motor		Continuity
      Connector	Terminal	Connector	Terminal
      E18	35	E220 (Cooling fan motor-1)	4	Existed
      	38	E221 (Cooling fan motor-2)	1

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

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

10. DETECT MALFUNCTIONING PART

    Check the following.

    • Joint connector-E02 E20
    • Harness connector E70, E305
    • Harness for open or short between cooling fan motor-1 and IPDM E/R
    • Harness for open or short between cooling fan motor-2 and IPDM E/R

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

11. CHECK COOLING FAN MOTOR CIRCUIT-III
    1. Check the continuity between cooling fan relay-2, -3 harness connectors and ground.

       Cooling fan motor		Ground	Continuity
       Connector	Terminal
       E42 (cooling fan relay-2)	6	Ground	Existed
       E43 (cooling fan relay-3)	6

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

       Is the inspection result normal? 

       YES: GO TO 12.

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

12. CHECK COOLING FAN MOTOR CIRCUIT-IV
    1. Check the continuity between cooling fan motor-2 harness connector and ground.

       Cooling fan motor-2		Ground	Continuity
       Connector	Terminal
       E221	3	Ground	Existed
       	4

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

       Is the inspection result normal? 

       YES: GO TO 13.

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

13. CHECK COOLING FAN RELAYS -2 AND -3

    Refer to "COMPONENT INSPECTION (COOLING FAN RELAY) ".

    Is the inspection result normal? 

    YES: GO TO 14.

    NO: Replace malfunctioning cooling fan relay.

14. CHECK COOLING FAN MOTORS -1 AND -2

    Refer to "COMPONENT INSPECTION (COOLING FAN MOTOR) ".

    Is the inspection result normal? 

    YES: GO TO 15.

    NO: Replace malfunctioning cooling fan motor. Refer to "REMOVAL AND INSTALLATION ".

15. CHECK INTERMITTENT INCIDENT

    Perform "INTERMITTENT INCIDENT ".

    Is the inspection result normal? 

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

    NO: Repair or replace harness connectors.