COOLING FAN SYSTEM Cooling Fan Circuit

DESCRIPTION

The ECM calculates an appropriate cooling fan speed based on the engine coolant temperature, air conditioning switch condition, refrigerant pressure, engine speed and vehicle speed, and sends the signals to the cooling fan ECUs to regulate the cooling fans. The cooling fan ECUs control each cooling fan speed based on the duty ratio signal sent from the ECM. By basing its control on the operating conditions, the ECM can control the fan speed optimally using the cooling fan ECUs, achieving both high cooling performance and quietness.

WIRING DIAGRAM

Refer to the System Diagram.

Click here

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK VEHICLE

   
   

   1. Check the cooling fan motor type.

      Result
      Result Proceed to for Cooling Fan Motor 240 W + 240 W Type A for Cooling Fan Motor 300 W + 300 W Type B

   
   

   B

   PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN DUTY RATIO) Click here

   A

2. PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN DUTY RATIO)

   
   

   1. Connect the GTS to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the GTS on.

   4. Enter the following menus: Powertrain / Engine / Active Test / Control the Engine Cooling Fan Duty Ratio.

      
      Powertrain > Engine > Active Test

      Tester Display
      Control the Engine Cooling Fan Duty Ratio

   5. Check the operation of the cooling fans while operating them using the GTS.

      OK
      Tester Operation Fan Operation 30 - 100% Cooling fans operate 0% Cooling fans stop

      Result
      Result Proceed to OK A NG (Fan does not operate) B NG (No. 2 fan does not operate) C NG (Fan does not stop) D NG (No. 2 fan does not stop) E

   
   

   A

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   C

   CHECK COOLING FAN SYSTEM (NO. 2 FAN) Click here

   D

   CHECK HARNESS AND CONNECTOR (COOLING FAN ECU - ECM) Click here

   E

   CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN ECU - ECM) Click here

   B

3. CHECK COOLING FAN SYSTEM (FAN)

   
   

   1. Disconnect the A91 ECM connector.

   2. Turn the engine switch on (IG).

   3. Check the operation of the cooling fan.

      OK
      The cooling fan operates.

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE ECM Click here

   NG

4. INSPECT COOLING FAN MOTOR

   
   

   1. Inspect the cooling fan motor.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE COOLING FAN MOTOR Click here

   OK

5. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU POWER SOURCE)

   
   

   1. Disconnect the A87 cooling fan ECU connector.

   2. Turn the engine switch on (IG).

   3. 

      *a	Front view of wire harness connector (to Cooling Fan ECU )

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition A87-1 (+B1) - A87-3 (E1) Engine switch on (IG) 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   CHECK HARNESS AND CONNECTOR (COOLING FAN ECU - BODY GROUND) Click here

   OK

6. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU AND NO. 2 COOLING FAN ECU - ECM)

   
   

   1. Disconnect the A91 ECM connector.

   2. Disconnect the A87 cooling fan ECU connector.

   3. Disconnect the f1 No. 2 cooling fan ECU connector.

   4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition A87-2 (SI), f1-2 (SI) or A91-60 (RFC) - Body ground Always 10 kΩ or higher

      Result
      Proceed to OK NG

   
   

   OK

   REPLACE COOLING FAN ECU

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU AND NO. 2 COOLING FAN ECU - ECM)

7. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU - BODY GROUND)

   
   

   1. Disconnect the A87 cooling fan ECU connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition A87-3 (E1) - Body ground Always Below 1 Ω

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU - BODY GROUND)

   OK

8. INSPECT FAN RELAY

   
   

   1. Inspect the FAN relay.

      Click here

      Result
      Proceed to OK NG

   
   

   NG

   REPLACE FAN RELAY

   OK

9. CHECK HARNESS AND CONNECTOR (FAN RELAY POWER SOURCE CIRCUIT)

   
   

   1. Remove the FAN relay from the No. 2 engine room relay block and No. 2 junction block assembly.

   2. Turn the engine switch on (IG).

   3. 

      *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
      *2	FAN Relay

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition 1 (FAN relay) - Body ground Engine switch on (IG) 11 to 14 V 3 (FAN relay) - Body ground Always 11 to 14 V

      Result
      Proceed to OK NG

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN RELAY POWER SOURCE CIRCUIT)

   OK

10. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU - FAN RELAY)

    
    

    1. Disconnect the A87 cooling fan ECU connector.

    2. Remove the FAN relay from the No. 2 engine room relay block and No. 2 junction block assembly.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition A87-1 (+B1) - 5 (FAN relay) Always Below 1 Ω

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition A87-1 (+B1) or 5 (FAN relay) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN RELAY - BODY GROUND)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU - FAN RELAY)

11. CHECK COOLING FAN SYSTEM (NO. 2 FAN)

    
    

    1. Disconnect the A91 ECM connector.

    2. Turn the engine switch on (IG).

    3. Check the operation of the cooling fan.

       OK
       The cooling fan operates.

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE ECM Click here

    NG

12. INSPECT NO. 2 COOLING FAN MOTOR

    
    

    1. Inspect the No. 2 cooling fan motor.

       Click here

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE NO. 2 COOLING FAN MOTOR Click here

    OK

13. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN ECU POWER SOURCE)

    
    

    1. Disconnect the f1 No. 2 cooling fan ECU connector.

    2. Turn the engine switch on (IG).

    3. 

       *a	Front view of wire harness connector (to No. 2 Cooling Fan ECU)

       Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Condition Specified Condition f1-1 (+B) - f1-3 (GND) Engine switch on (IG) 11 to 14 V

       Result
       Proceed to OK NG

    
    

    NG

    CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN ECU - BODY GROUND) Click here

    OK

14. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU AND NO. 2 COOLING FAN ECU - ECM)

    
    

    1. Disconnect the A91 ECM connector.

    2. Disconnect the A87 cooling fan ECU connector.

    3. Disconnect the f1 No. 2 cooling fan ECU connector.

    4. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition A87-2 (SI), f1-2 (SI) or A91-60 (RFC) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE NO. 2 COOLING FAN ECU

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU AND NO. 2 COOLING FAN ECU - ECM)

15. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN ECU - BODY GROUND)

    
    

    1. Disconnect the f1 No. 2 cooling fan ECU connector.

    2. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition f1-3 (GND) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 COOLING FAN ECU - BODY GROUND)

    OK

16. INSPECT FAN NO. 2 RELAY

    
    

    1. Inspect the FAN NO. 2 relay.

       Click here

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FAN NO. 2 RELAY

    OK

17. CHECK HARNESS AND CONNECTOR (FAN NO. 2 RELAY POWER SOURCE CIRCUIT)

    
    

    1. Remove the FAN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

       

       *A	for LHD	*B	for RHD
       *1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly	*2	FAN NO. 2 Relay

       Standard Voltage
       Tester Connection Condition Specified Condition 1 (FAN NO. 2 relay) - Body ground Engine switch on (IG) 11 to 14 V 3 (FAN NO. 2 relay) - Body ground Always 11 to 14 V

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 2 RELAY POWER SOURCE CIRCUIT)

    OK

18. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN ECU - FAN NO. 2 RELAY)

    
    

    1. Disconnect the f1 No. 2 cooling fan ECU connector.

    2. Remove the FAN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition f1-1 (+B) - 5 (FAN NO. 2 relay) Always Below 1 Ω

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition f1-1 (+B) or 5 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 2 RELAY - BODY GROUND)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 COOLING FAN ECU - FAN NO. 2 RELAY)

19. CHECK HARNESS AND CONNECTOR (COOLING FAN ECU - ECM)

    
    

    1. Disconnect the A91 ECM connector.

    2. Disconnect the A87 cooling fan ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition A87-2 (SI) - A91-60 (RFC) Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN ECU - ECM)

    OK

20. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - BODY GROUND)

    
    

    1. Disconnect the z13 cooling fan motor connector.

    2. 

       *a	Component without harness connected (Cooling Fan Motor)

       Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition z13-1 (-) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE COOLING FAN ECU

    NG

    REPLACE COOLING FAN MOTOR Click here

21. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN ECU - ECM)

    
    

    1. Disconnect the A91 ECM connector.

    2. Disconnect the f1 No. 2 cooling fan ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition f1-2 (SI) - A91-60 (RFC) Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 COOLING FAN ECU - ECM)

    OK

22. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - BODY GROUND)

    
    

    1. Disconnect the z14 No. 2 cooling fan motor connector.

    2. 

       *a	Component without harness connected (No. 2 Cooling Fan Motor)

       Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition z14-1 (-) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE NO. 2 COOLING FAN ECU

    NG

    REPLACE NO. 2 COOLING FAN MOTOR Click here

23. PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN DUTY RATIO)

    
    

    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Engine Cooling Fan Duty Ratio.

       
       Powertrain > Engine > Active Test

       Tester Display
       Control the Engine Cooling Fan Duty Ratio

    5. Check the operation of the cooling fans while operating them using the GTS.

       OK
       Tester Operation Fan Operation 30 - 100% Cooling fans operate 0% Cooling fans stop

       Result
       Result Proceed to OK A NG (Fan does not operate) B NG (No. 2 fan does not operate) C NG (Fan does not stop) D NG (No. 2 fan does not stop) E

    
    

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    CHECK COOLING FAN SYSTEM (NO. 2 FAN) Click here

    D

    CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - ECM) Click here

    E

    CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - ECM) Click here

    B

24. CHECK COOLING FAN SYSTEM (FAN)

    
    

    1. Disconnect the A91 ECM connector.

    2. Turn the engine switch on (IG).

    3. Check the operation of the cooling fan.

       OK
       The cooling fan operates.

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE ECM Click here

    NG

25. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR POWER SOURCE)

    
    

    1. Disconnect the A97 cooling fan motor connector.

    2. Turn the engine switch on (IG).

    3. 

       *a	Front view of wire harness connector (to Cooling Fan Motor)

       Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Condition Specified Condition A97-1 (E1) - A97-3 (+B1) Engine switch on (IG) 11 to 14 V

       Result
       Proceed to OK NG

    
    

    NG

    CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - BODY GROUND) Click here

    OK

26. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR AND NO. 2 COOLING FAN MOTOR - ECM)

    
    

    1. Disconnect the A91 ECM connector.

    2. Disconnect the A97 cooling fan motor connector.

    3. Disconnect the f2 No. 2 cooling fan motor connector.

    4. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition A97-2 (SI), f2-2 (SI) or A91-60 (RFC) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE COOLING FAN MOTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR AND NO. 2 COOLING FAN MOTOR - ECM)

27. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - BODY GROUND)

    
    

    1. Disconnect the A97 cooling fan motor connector.

    2. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition A97-1 (E1) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR - BODY GROUND)

    OK

28. INSPECT FAN RELAY

    
    

    1. Inspect the FAN relay.

       Click here

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FAN RELAY

    OK

29. CHECK HARNESS AND CONNECTOR (FAN RELAY POWER SOURCE CIRCUIT)

    
    

    1. Remove the FAN relay from the No. 2 engine room relay block and No. 2 junction block assembly.

    2. Turn the engine switch on (IG).

    3. 

       *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
       *2	FAN Relay

       Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Condition Specified Condition 1 (FAN relay) - Body ground Engine switch on (IG) 11 to 14 V 3 (FAN relay) - Body ground Always 11 to 14 V

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN RELAY POWER SOURCE CIRCUIT)

    OK

30. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - FAN RELAY)

    
    

    1. Disconnect the A97 cooling fan motor connector.

    2. Remove the FAN relay from the No. 2 engine room relay block and No. 2 junction block assembly.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition A97-3 (+B1) - 5 (FAN relay) Always Below 1 Ω

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition A97-3 (+B1) or 5 (FAN relay) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN RELAY - BODY GROUND)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR - FAN RELAY)

31. CHECK COOLING FAN SYSTEM (NO. 2 FAN)

    
    

    1. Disconnect the A91 ECM connector.

    2. Turn the engine switch on (IG).

    3. Check the operation of the cooling fan.

       OK
       The cooling fan operates.

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE ECM Click here

    NG

32. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR POWER SOURCE)

    
    

    1. Disconnect the f2 No. 2 cooling fan motor connector.

    2. Turn the engine switch on (IG).

    3. 

       *a	Front view of wire harness connector (to No. 2 Cooling Fan Motor)

       Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Condition Specified Condition f2-3 (+B) - f2-1 (GND) Engine switch on (IG) 11 to 14 V

       Result
       Proceed to OK NG

    
    

    NG

    CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - BODY GROUND) Click here

    OK

33. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR AND NO. 2 COOLING FAN MOTOR - ECM)

    
    

    1. Disconnect the A91 ECM connector.

    2. Disconnect the A97 cooling fan motor connector.

    3. Disconnect the f2 No. 2 cooling fan motor connector.

    4. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition A97-2 (SI), f2-2 (SI) or A91-60 (RFC) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE NO. 2 COOLING FAN MOTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR AND NO. 2 COOLING FAN MOTOR - ECM)

34. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - BODY GROUND)

    
    

    1. Disconnect the f2 No. 2 cooling fan motor connector.

    2. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition f2-1 (GND) - Body ground Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 COOLING FAN MOTOR - BODY GROUND)

    OK

35. INSPECT FAN NO. 2 RELAY

    
    

    1. Inspect the FAN NO. 2 relay.

       Click here

       Result
       Proceed to OK NG

    
    

    NG

    REPLACE FAN NO. 2 RELAY

    OK

36. CHECK HARNESS AND CONNECTOR (FAN NO. 2 RELAY POWER SOURCE CIRCUIT)

    
    

    1. Remove the FAN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

    2. Turn the engine switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

       

       *A	for LHD	*B	for RHD
       *1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly	*2	FAN NO. 2 Relay

       Standard Voltage
       Tester Connection Condition Specified Condition 1 (FAN NO. 2 relay) - Body ground Engine switch on (IG) 11 to 14 V 3 (FAN NO. 2 relay) - Body ground Always 11 to 14 V

       Result
       Proceed to OK NG

    
    

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 2 RELAY POWER SOURCE CIRCUIT)

    OK

37. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - FAN NO. 2 RELAY)

    
    

    1. Disconnect the f2 No. 2 cooling fan motor connector.

    2. Remove the FAN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition f2-3 (+B) - 5 (FAN NO. 2 relay) Always Below 1 Ω

       Standard Resistance (Check for Short)
       Tester Connection Condition Specified Condition f2-3 (+B) or 5 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher

       Result
       Proceed to OK NG

    
    

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 2 RELAY - BODY GROUND)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 COOLING FAN MOTOR - FAN NO. 2 RELAY)

38. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR - ECM)

    
    

    1. Disconnect the A91 ECM connector.

    2. Disconnect the A97 cooling fan motor connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition A97-2 (SI) - A91-60 (RFC) Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE COOLING FAN MOTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COOLING FAN MOTOR - ECM)

39. CHECK HARNESS AND CONNECTOR (NO. 2 COOLING FAN MOTOR - ECM)

    
    

    1. Disconnect the A91 ECM connector.

    2. Disconnect the f2 No. 2 cooling fan motor connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance (Check for Open)
       Tester Connection Condition Specified Condition f2-2 (SI) - A91-60 (RFC) Always Below 1 Ω

       Result
       Proceed to OK NG

    
    

    OK

    REPLACE NO. 2 COOLING FAN MOTOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 2 COOLING FAN MOTOR - ECM)