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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 351 (Engine Control System (DTC/Circuit Diagnosis) (16 Of 17)) >> DTC/Circuit Diagnosis >> Cooling Fan >> Diagnosis Procedure (Cooling Fan Motor)

Diagnosis Procedure (Cooling Fan Motor)

WARNING: This page is about a different car, the 2019 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY-I 
    1. Turn ignition switch OFF.
    2. Disconnect cooling fan control module harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between cooling fan control module harness connector and ground.

      +

      -

      Voltage

      Cooling fan control module

      Connector

      Terminal

      E225

      3

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    GO TO 2.

  2. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY-II 
    1. Turn ignition switch OFF.
    2. Remove cooling fan relay.
    3. Check the voltage between cooling fan relay harness connector and ground.

      +

      -

      Voltage

      Cooling fan relay

      Connector

      Terminal

      E82

      3

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 3.

  3. CHECK FUSIBLE LINK 

    Check that 60A fusible link (No. H) is not blowing.

    Is the fusible link blown (open)?

    YES

    Perform trouble diagnosis for power supply circuit.

    NO

    Replace the fusible link after repairing the applicable circuit.

  4. CHECK COOLING FAN CONTROL MODULE POWER SUPPLY CIRCUIT 
    1. Check the continuity between cooling fan relay harness connector and cooling fan control module harness connector.

      Cooling fan relay

      Cooling fan control module

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E82

      5

      E225

      3

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

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace error-detected parts.

  5. CHECK COOLING FAN RELAY DRIVE POWER SUPPLY 
    1. Turn ignition switch ON.
    2. Check the voltage between cooling fan relay harness connector and ground.

      +

      -

      Voltage

      Cooling fan relay

      Connector

      Terminal

      E82

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 6.

  6. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Check that 10A fuse (No. 48) is not blowing.

    Is the fuse blown (open)?

    YES

    GO TO 7.

    NO

    Replace the fuse after repairing the applicable circuit.

  7. CHECK COOLING FAN RELAY DRIVE POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector.
    3. Check the continuity between IPDM E/R harness connector and cooling fan relay harness connector.

      IPDM E/R

      Cooling fan relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E119

      36

      E82

      1

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

    Is the inspection result normal?

    YES

    GO TO 10

    NO

    Repair or replace error-detected parts.

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

      IPDM E/R

      Cooling fan relay

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E119

      27

      E82

      2

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

    Is the inspection result normal?

    YES

    GO TO 9.

    NO

    Repair or replace error-detected parts.

  9. CHECK COOLING FAN RELAY 

    Refer to Component Inspection (Cooling Fan Relay) .

    Is the inspection result normal?

    YES

    GO TO 10.

    NO

    Replace cooling fan relay.

  10. 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 error-detected parts.

  11. CHECK COOLING FAN CONTROL MODULE GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check the continuity between cooling fan control module harness circuit.

      Cooling fan control module

      --

      Continuity

      Connector

      Terminal

      E225

      1

      Ground

      Existed
    3. Also check harness for short to power.

    Is the inspection result normal?

    YES

    GO TO 12.

    NO

    Repair or replace error-detected parts.

  12. CHECK COOLING FAN CONTROL SIGNAL 
    1. Reconnect cooling fan control module harness connector.
    2. Start engine.
    3. Check the voltage between IPDM E/R harness connector and ground.

      +

      -

      Condition

      Voltage

      IPDM E/R

      Connector

      Terminal

      E218

      93

      Ground

      Engine idling

      0 - 5 V

    Is the inspection result normal?

    YES

    GO TO 13.

    NO

    GO TO 10.

  13. CHECK COOLING FAN CONTROL SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R harness connector and cooling fan control module harness connector.
    3. Check the continuity between IPDM E/R harness connector and cooling fan control module harness connector.

      IPDM E/R

      Cooling fan control module

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E218

      93

      E225

      2

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

    Is the inspection result normal?

    YES

    GO TO 14.

    NO

    Repair or replace error-detected parts.

  14. CHECK COOLING FAN CONTROL MODULE OUTPUT SIGNAL 
    1. Reconnect all harness connectors disconnected.
    2. Disconnect cooling fan control module harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between cooling fan control module connector and ground.

      +

      -

      Voltage

      Cooling fan control module

      Motor

      Connector

      Terminal

      1

      E245

      4

      Ground

      Battery voltage

      2

      E246

      6

    Is the inspection result normal?

    YES

    GO TO 15.

    NO

    Replace cooling fan control module. Refer to Exploded View .

  15. CHECK COOLING FAN MOTOR 

    Refer to Component Inspection (Cooling Fan Motor) .

    Is the inspection result normal?

    YES

    Perform intermittent incident. Refer to Intermittent Incident

    NO

    Replace malfunctioning cooling fan motor. Refer to Exploded View .

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