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Cooling Fan Circuit [11/2022 - ]: Procedure

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  1. PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN) 
    1. Connect the GTS to the DLC3.
    2. Turn the ignition switch to ON (IG)
    3. Turn the GTS 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 GTS.

      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 [11/2022 - ] 

    Result: 

    NG 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (FANL - FANH POWER SOURCE) 
    1. Disconnect the A47 ECM connector.
    2. Turn the ignition switch to ON (IG)
    3. Measure the voltage according to the value(s) in the table below.
      GTY1103695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a ECM connector

      Standard Voltage

      Tester Connection Condition Specified Condition
      A47-32 (FANH) - Body ground Ignition switch ON 11 to 14 V
      A47-33 (FANL) - Body ground Ignition switch ON 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.
      GTY1103468Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 FAN NO. 1 Relay
      *3 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 [11/2022 - ]

      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 NO. 2 COOLING FAN MOTOR 
    1. Inspect the No. 2 cooling fan motor.

      Refer to PROCEDURE - Step 2

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 2 COOLING FAN MOTOR 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (COOLING FAN MOTOR RH - BODY GROUND) 
    1. Disconnect the A182 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
      A182-1 - 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 A182 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.
      GTY1105713Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 FAN NO. 1 Relay
      *3 FAN NO. 2 Relay - -

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A182-2 - 5 (FAN NO. 1 relay) Always Below 1 Ω
      A182-2 - 4 (FAN NO. 2 relay) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A182-2 or 5 (FAN NO. 1 relay) - Body ground Always 10 kΩ or higher
      A182-2 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 
    1. Inspect the cooling fan motor.

      Refer to ON-VEHICLE INSPECTION [11/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE COOLING FAN MOTOR 

    Refer to REMOVAL [11/2022 - ]

    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 A183 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.
      GTY1103467Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 FAN NO. 1 Relay
      *3 FAN NO. 3 Relay - -

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      A183 - 3 (FAN NO. 2 relay) Always Below 1 Ω
      A183-2 - 5 (FAN NO. 3 relay) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A183-1 or 3 (FAN NO. 2 relay) - Body ground Always 10 kΩ or higher
      A183-2 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.
      GTY1108880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 FAN NO. 1 Relay
      *3 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) - 1 (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 [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 [11/2022 - ]

      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.
      GTY1104293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 FAN NO. 1 Relay
      *3 FAN NO. 2 Relay *4 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.
      GTY1104294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 FAN NO. 1 Relay
      *3 FAN NO. 2 Relay *4 FAN NO. 3 Relay

      Standard Resistance (Check for Open)

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

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      1 (FAN NO. 1 relay) or 5 (EFI-MAIN NO. 1 relay) - Body ground Always 10 kΩ or higher
      1 (FAN NO. 2 relay) or 5 (EFI-MAIN NO. 1 relay) - Body ground Always 10 kΩ or higher
      1 (FAN NO. 3 relay) or 5 (EFI-MAIN NO. 1 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, FAN NO. 2 RELAY AND FAN NO. 3 RELAY - EFI-MAIN NO. 1 RELAY) 

    Result: 

    OK 

    See step  15

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      3 (EFI-MAIN NO. 1 relay) - Body ground Always 11 to 14 V
      GTY1107978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly *2 EFI-MAIN NO. 1 Relay

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY POWER SOURCE CIRCUIT) 

    Result: 

    OK 

    See step  16

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      EFI-MAIN NO. 1 - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

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

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (ECM - EFI-MAIN NO. 1 RELAY) 
    1. Disconnect the A47 ECM connector.
    2. Disconnect the EFI-MAIN NO. 1 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
      A47-15 (MREL) - 1(EFI-MAIN NO. 1 relay) Always Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      A47-15 (MREL) or 1(EFI-MAIN NO. 1 relay) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [11/2022 - ]

    Result: 

    NG 

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

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