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Cooling Fan Circuit [01/2019 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE ENGINE COOLING FAN) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Engine Cooling Fan.

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Engine Cooling Fan
    5. Perform the Active Test according to the display on the Techstream.

      OK

      Active Tester Operation Fan Operation
      HIGH Cooling fans high speed operate
      LOW Cooling fans low speed operate
      OFF Cooling fans stop

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [01/2019 - ]  

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (FANL - FANH POWER SOURCE) 
    1. Disconnect the A46 ECM connector.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.
      GTY930583Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to ECM)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A46-8 (FANH) - Body ground Power switch on (IG) 11 to 14 V
      A46-7 (FANL) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  12

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY AND FAN NO. 3 RELAY POWER SOURCE CIRCUIT) 
    1. Remove the FAN NO. 1 relay from the No. 2 relay block.
    2. Remove the FAN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Measure the voltage according to the value(s) in the table below.
      GTY884848Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block
      *3 FAN NO. 1 Relay *4 FAN NO. 3 Relay

      Standard Voltage

      Tester Connection Condition Specified Condition
      3 (FAN NO. 1 relay) - Body ground Always 11 to 14 V
      3 (FAN NO. 3 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY AND FAN NO. 3 RELAY POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  4

  4. INSPECT COOLING FAN RELAY (FAN NO. 1, FAN NO. 2 AND FAN NO. 3) 
    1. Inspect the FAN NO. 1 relay, FAN NO. 2 relay and FAN NO. 3 relay.

      Refer to ON-VEHICLE INSPECTION [01/2019 - ]

      Result

      Result Proceed to
      OK A
      NG (FAN NO. 1 relay) B
      NG (FAN NO. 2 relay) C
      NG (FAN NO. 3 relay) D

    Result: 

    B 

    REPLACE FAN NO. 1 RELAY 

    Result: 

    C 

    REPLACE FAN NO. 2 RELAY 

    Result: 

    D 

    REPLACE FAN NO. 3 RELAY 

    Result: 

    A 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (FAN NO. 2 RELAY - BODY GROUND) 
    1. Remove the FAN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
      GTY931809Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
      *2 FAN NO. 2 Relay
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      5 (FAN NO. 2 relay) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  6

  6. INSPECT COOLING FAN MOTOR RH 
    1. Inspect the cooling fan motor RH.

      Refer to PROCEDURE - Step 2

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COOLING FAN MOTOR RH. Refer to  REMOVAL [01/2019 - 04/2020]  , or refer to  REMOVAL [04/2020 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - BODY GROUND) 
    1. Disconnect the A4 cooling fan motor RH connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A4-1 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY AND FAN NO. 2 RELAY - COOLING FAN MOTOR RH) 
    1. Disconnect the A4 cooling fan motor RH connector.
    2. Remove the FAN NO. 1 relay from the No. 2 relay block.
    3. Remove the FAN NO. 2 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    4. Measure the resistance according to the value(s) in the table below.
      GTY879414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block
      *3 FAN NO. 1 Relay *4 FAN NO. 2 Relay

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A4-2 - 5 (FAN NO. 1 relay) Always Below 1 Ω
      A4-2 - 4 (FAN NO. 2 relay) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A4-2 or 5 (FAN NO. 1 relay) - Body ground Always 10 kΩ or higher
      A4-2 or 4 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY AND FAN NO. 2 RELAY - COOLING FAN MOTOR RH) 

    Result: 

    OK 

    See step  9

  9. INSPECT COOLING FAN MOTOR LH 
    1. Inspect the cooling fan motor LH.

      Refer to PROCEDURE - Step 1

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COOLING FAN MOTOR LH. Refer to  REMOVAL [01/2019 - 04/2020]  , or refer to  REMOVAL [04/2020 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (FAN NO. 2 RELAY AND FAN NO. 3 RELAY - COOLING FAN MOTOR LH) 
    1. Disconnect the A5 cooling fan motor LH connector.
    2. Remove the FAN NO. 2 relay and FAN NO. 3 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.
      GTY932768Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 FAN NO. 2 Relay
      *3 FAN NO. 3 Relay - -

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A5-1 - 3 (FAN NO. 2 relay) Always Below 1 Ω
      A5-2 - 5 (FAN NO. 3 relay) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A5-1 or 3 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher
      A5-2 or 5 (FAN NO. 3 relay) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 2 RELAY AND FAN NO. 3 RELAY - COOLING FAN MOTOR LH) 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY - FAN NO. 2 RELAY) 
    1. Remove the FAN NO. 1 relay from the No. 2 relay block.
    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.
      GTY879414Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block
      *3 FAN NO. 1 Relay *4 FAN NO. 2 Relay

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) - 1 (FAN NO. 2 relay) Always Below 1 Ω
      2 (FAN NO. 1 relay) - 2 (FAN NO. 2 relay) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) or 1 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher
      2 (FAN NO. 1 relay) or 2 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [01/2019 - 04/2020]  , or refer to  REMOVAL [04/2020 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022]  , or refer to  REMOVAL [11/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE NO. 2 RELAY BLOCK 

  12. INSPECT COOLING FAN RELAY (FAN NO. 1, FAN NO. 2 AND FAN NO. 3) 
    1. Inspect the FAN NO. 1 relay, FAN NO. 2 relay and FAN NO. 3 relay.

      Refer to ON-VEHICLE INSPECTION [01/2019 - ]

      Result

      Result Proceed to
      OK A
      NG (FAN NO. 1 relay) B
      NG (FAN NO. 2 relay) C
      NG (FAN NO. 3 relay) D

    Result: 

    B 

    REPLACE FAN NO. 1 RELAY 

    Result: 

    C 

    REPLACE FAN NO. 2 RELAY 

    Result: 

    D 

    REPLACE FAN NO. 3 RELAY 

    Result: 

    A 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY, FAN NO. 2 RELAY AND FAN NO. 3 RELAY POWER SOURCE CIRCUIT) 
    1. Remove the FAN NO. 1 relay from the No. 2 relay block.
    2. Remove the FAN NO. 2 relay and FAN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Measure the voltage according to the value(s) in the table below.
      GTY875063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block
      *3 FAN NO. 1 Relay *4 FAN NO. 2 Relay
      *5 FAN NO. 3 Relay - -

      Standard Voltage

      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) - Body ground Always 11 to 14 V
      1 (FAN NO. 2 relay) - Body ground Always 11 to 14 V
      1 (FAN NO. 3 relay) - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY, FAN NO. 2 RELAY AND FAN NO. 3 RELAY - ECM) 

    Result: 

    NG 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (FAN NO. 1 RELAY, FAN NO. 2 RELAY AND FAN NO. 3 RELAY - NO. 1 INTEGRATION RELAY) 
    1. Remove the FAN NO. 1 relay from the No. 2 relay block.
    2. Remove the FAN NO. 2 relay and FAN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Remove the No. 1 integration relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    4. Disconnect the 2B No. 1 integration relay connector.
    5. Measure the resistance according to the value(s) in the table below.
      GTY875063Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 No. 2 Relay Block
      *3 FAN NO. 1 Relay *4 FAN NO. 2 Relay
      *5 FAN NO. 3 Relay - -

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) - 2B-4 Always Below 1 Ω
      1 (FAN NO. 2 relay) - 2B-4 Always Below 1 Ω
      1 (FAN NO. 3 relay) - 2B-4 Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) or 2B-4 - Body ground Always 10 kΩ or higher
      1 (FAN NO. 2 relay) or 2B-4 - Body ground Always 10 kΩ or higher
      1 (FAN NO. 3 relay) or 2B-4 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FAN NO. 1 RELAY, FAN NO. 2 RELAY AND FAN NO. 3 RELAY - NO. 1 INTEGRATION RELAY) 

    Result: 

    OK 

    See step  15

  15. INSPECT NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY) 
    1. Inspect the No. 1 integration relay.

      Refer to INSPECTION [01/2019 - 09/2022] , or refer to INSPECTION [09/2022 - 11/2022] , or refer to INSPECTION [11/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE NO. 1 INTEGRATION RELAY (EFI-MAIN RELAY) 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY POWER SOURCE CIRCUIT) 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the 2B No. 1 integration relay connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      2B-3 - Body ground Always 11 to 14 V
      GTY874183Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Integration Relay)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND) 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the 2B No. 1 integration relay connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2B-5 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND) 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (ECM - NO. 1 INTEGRATION RELAY) 
    1. Disconnect the A46 ECM connector.
    2. Disconnect the 2B No. 1 integration relay connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A46-46 (MREL) - 2B-6 Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A46-46 (MREL) or 2B-6 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [01/2019 - 04/2020]  , or refer to  REMOVAL [04/2020 - 09/2022]  , or refer to  REMOVAL [09/2022 - 11/2022]  , or refer to  REMOVAL [11/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - NO. 1 INTEGRATION RELAY) 

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