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Home >> Toyota >> 2020 >> RAV4 XLE, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 178 (Engine Cooling Fan System (A25A-FXS) - Diagnostics & Circuit Tests) >> Cooling Fan System >> Cooling Fan Circuit [02/2019 - 08/2020] >> Procedure

Cooling Fan Circuit [02/2019 - 08/2020]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ENGINE COOLING FAN DUTY RATIO) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON (IG).
    3. Turn the Techstream 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 fan while operating it using the Techstream.

      OK

      Techstream Operation Fan Operation
      30 - 100% Cooling fan operates
      0% Cooling fan stops

      Result

      Result Proceed to
      OK A
      Cooling fan does not operate B
      Cooling fan does not stop C

    Result: 

    A 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [02/2019 - 08/2020]  

    Result: 

    C 

    See step  8

    Result: 

    B 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (FAN WITH MOTOR ASSEMBLY - ECM) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Disconnect the A24 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A25-3 (SI) or A24-32 (RFC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. INSPECT ECM (RFC TERMINAL) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON (IG).
    4. Turn the Techstream on.
    5. 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
    6. Operate the cooling fan motor (fan with motor assembly) using the Active Test function and measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Techstream Operation Specified Condition
      A25-3 (SI) - Body ground Before Active Test (0%) → During Active Test (100%) Before Active Test (0%): Resistance is stable → During Active Test (100%): Resistance fluctuates*

      HINT: 

      *: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the RFC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE ECM. Refer to  REMOVAL [02/2019 - 08/2020] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FAN WITH MOTOR ASSEMBLY POWER SOURCE) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Measure the voltage according to the value(s) in the table below.
      GTY942557Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Fan with Motor Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A25-1 (+B1) - A25-2 (E1) Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (FAN WITH MOTOR ASSEMBLY POWER SOURCE) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Turn the ignition switch to ON (IG).
    3. Measure the voltage according to the value(s) in the table below.
      GTY912434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Fan with Motor Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A25-4 (IGS1) - A25-2 (E1) Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FAN WITH MOTOR ASSEMBLY. Refer to  REMOVAL [02/2019 - 12/2021] 

    Result: 

    NG 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (FAN WITH MOTOR ASSEMBLY - EFI-MAIN NO. 1 RELAY) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Remove the EFI-MAIN NO. 1 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

      Tester Connection Condition Specified Condition
      A25-4 (IGS1) - 5 (EFI-MAIN NO. 1 relay) Always Below 1 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    CHECK ECM POWER SOURCE CIRCUIT 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (FAN WITH MOTOR ASSEMBLY - BODY GROUND) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A25-2 (E1) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN WITH MOTOR ASSEMBLY - AUXILIARY BATTERY) 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. INSPECT ECM (RFC TERMINAL) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Connect the Techstream to the DLC3.
    3. Turn the ignition switch to ON (IG).
    4. Turn the Techstream on.
    5. 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
    6. Operate the cooling fan motor (fan with motor assembly) using the Active Test function and measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Techstream Operation Specified Condition
      A25-3 (SI) - Body ground Before Active Test (0%) → During Active Test (100%) Before Active Test (0%): Resistance is stable → During Active Test (100%): Resistance fluctuates*

      HINT: 

      *: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the RFC terminal will be unstable during the Active Test. If the resistance is stable before the Active Test and fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FAN WITH MOTOR ASSEMBLY. Refer to  REMOVAL [02/2019 - 12/2021] 

    Result: 

    NG 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (FAN WITH MOTOR ASSEMBLY - ECM) 
    1. Disconnect the A25 fan with motor assembly connector.
    2. Disconnect the A24 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A25-3 (SI) - A24-32 (RFC) Always Below 1 Ω

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [02/2019 - 08/2020] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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