Inspection When Radiator Fans Do Not Stop

INSPECTION WHEN MAIN FAN AND SUB FAN DO NOT STOP
1. CHECK SUB FAN RELAY .
  1. Disconnect the ground terminal from battery sensor. Ref. to GROUND TERMINAL REMOVAL OR INSTALLATION .
  2. Remove the sub fan relay. Ref. to COOLING (H4DO)>Radiator Fan Relay>LOCATION .
  3. Perform unit check for the sub fan relay. Ref. to COOLING (H4DO)>Radiator Fan Relay>INSPECTION .
  Is the sub fan relay OK?
  
  Yes
  
  Go to 2 .
  
  No
  1. Replace the sub fan relay.
  2. Restore the vehicle to its original state.
2. INSULATION CHECK OF HARNESS BETWEEN SUB FAN RELAY AND SUB FAN MOTOR .
  1. Connect the ground terminal to battery sensor. Ref. to GROUND TERMINAL REMOVAL OR INSTALLATION .
    NOTE: Sub fan relay is removed .
  2. Turn to IG ON.
  3. Check the radiator fan operation.
  Do the sub fan motor and the main fan motor rotate?
  
  Yes
  1. Repair the harness between sub fan relay and sub fan motor.
  2. Restore the vehicle to its original state.
  No
  
  Go to 3 .
3. INSULATION CHECK OF HARNESS BETWEEN SUB FAN RELAY AND ECM .
  1. Disconnect the ground terminal from battery sensor. Ref. to GROUND TERMINAL REMOVAL OR INSTALLATION .
  2. Disconnect the ECM connector. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM)>REMOVAL .
  3. Check insulation of harness and chassis ground between sub fan relay and ECM.
  Are they insulated?
  
  Yes
  1. Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) ).
  2. Restore the vehicle to its original state.
  No
  1. Repair the harness between sub fan relay and ECM.
  2. Restore the vehicle to its original state.

INSPECTION WHEN ONLY MAIN FAN DOES NOT STOP
1. CHECK MAIN FAN RELAY 1 .
  1. Disconnect the ground terminal from battery sensor. Ref. to GROUND TERMINAL REMOVAL OR INSTALLATION .
  2. Remove the main fan relay 1. Ref. to COOLING (H4DO)>Radiator Fan Relay>LOCATION .
  3. Perform unit check for the main fan relay 1. Ref. to COOLING (H4DO)>Radiator Fan Relay>INSPECTION .
  Is the main fan relay 1 OK?
  
  Yes
  
  Go to 2 .
  
  No
  1. Replace the main fan relay 1.
  2. Restore the vehicle to its original state.
2. INSULATION CHECK OF HARNESS BETWEEN MAIN FAN MOTOR AND SUB FAN MOTOR .
  1. Connect the ground terminal to battery sensor. Ref. to GROUND TERMINAL REMOVAL OR INSTALLATION .
    NOTE: Main fan relay 1 is removed.
  2. Turn to IG ON.
  3. Check the radiator fan operation.
  Does the main fan motor rotate?
  
  Yes
  1. Repair the harness between the main fan motor and the sub fan motor.
  2. Restore the vehicle to its original state.
  No
  1. Replace the ECM. Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO)>ENGINE CONTROL MODULE (ECM) ).
  2. Restore the vehicle to its original state.