DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2GR-FKS) - Circuit Tests (2 Of 2) & Symptom Tests >> SFI System >> ACIS Control Circuit [12/2019 - 10/2022] >> Procedure

ACIS Control Circuit [12/2019 - 10/2022]: Procedure

  1. PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR INTAKE CONTROL) 
    1. Start the engine.
    2. According to the display on the GTS, perform the Active Test to operate the No. 1 vacuum switching valve assembly (for intake air control valve sub-assembly) and check for the operating sound of the intake air control valve sub-assembly in the intake air surge tank assembly.

      Powertrain > Engine > Active Test 

      Tester Display
      Activate the VSV for Intake Control

      OK

      Operating sounds can be heard.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - 10/2022] 

    Result: 

    NG 

    See step  2

  2. INSPECT INTAKE AIR SURGE TANK ASSEMBLY (INTAKE AIR CONTROL VALVE SUB-ASSEMBLY OPERATION) 

    Refer to ON-VEHICLE INSPECTION [12/2019 - 10/2022]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE INTAKE AIR SURGE TANK ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    OK 

    See step  3

  3. INSPECT VACUUM HOSE SUB-ASSEMBLY (NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - INTAKE AIR SURGE TANK ASSEMBLY) 
    1. Check the vacuum hose sub-assembly (No. 1 vacuum switching valve assembly (for intake air control valve sub-assembly) - intake air surge tank assembly) for looseness, disconnection and blockage.

      OK

      No looseness, disconnection or blockage.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE VACUUM HOSE SUB-ASSEMBLY 

    Result: 

    OK 

    See step  4

  4. CHECK VACUUM 
    1. Disconnect the vacuum hose sub-assembly from the No. 1 vacuum switching valve assembly (for intake air control valve sub-assembly).
      GTY628265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Start the engine.
    3. Using your finger, confirm that the hose has suction.

      Result

      Result Proceed to
      Suction applied A
      No suction B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  5

  5. INSPECT NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) 

    Refer to INSPECTION [12/2019 - 10/2022]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY). Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    OK 

    See step  6

  6. CHECK TERMINAL VOLTAGE (POWER SOURCE OF NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY)) 
    1. Disconnect the No. 1 vacuum switching valve assembly (for intake air control valve sub-assembly) connector.
      GTY872602Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to No. 1 Vacuum Switching Valve Assembly (for Intake Air Control Valve Sub-assembly))
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C29-2(+B) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - ECM) 
    1. Disconnect the No. 1 vacuum switching valve assembly (for intake air control valve sub-assembly) connector.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      C29-1 (ACIS) - C54-66 (ACIS) Always Below 1 Ω
      C29-1 (ACIS) or C54-66 (ACIS) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. CHECK HARNESS AND CONNECTOR (EFI-MAIN RELAY - NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY)) 
    1. Remove the EFI-MAIN relay, FUEL PMP relay and A/F HTR relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      HINT: 

      Remove the FUEL PMP and A/F HTR relays connected between the checked terminals as the coil inside the relay influences the measurement value.

    2. Disconnect the No. 1 vacuum switching valve assembly (for intake air control valve sub-assembly) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (EFI-MAIN relay) - C29-2 (+B) Always Below 1 Ω
      5 (EFI-MAIN relay) or C29-2 (+B) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO ECM POWER SOURCE CIRCUIT. Refer to  ECM Power Source Circuit [12/2019 - 10/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  9. INSPECT VACUUM PUMP ASSEMBLY 

    Refer to ON-VEHICLE INSPECTION [12/2019 - 10/2022]

    Result

    Proceed to
    OK
    NG

    Result: 

    OK 

    REPAIR OR REPLACE VACUUM HOSE SUB-ASSEMBLY (NO. 1 VACUUM SWITCHING VALVE ASSEMBLY (FOR INTAKE AIR CONTROL VALVE SUB-ASSEMBLY) - VACUUM PUMP ASSEMBLY) 

    Result: 

    NG 

    REPLACE VACUUM PUMP ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

Diesel-Data.com