LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2019 >> GS F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes And Circuit Tests >> SFI System >> Circuit Tests >> Air Intake Control Circuit [10/2015 - ] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Air Intake Control Circuit [10/2015 - ]: Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR AICV) 
    GTY650250Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *1 Air
    *2 Port E
    *3 Port F
    *4 Air Filter
    *a Vacuum Switching Valve is On
    *b Vacuum Switching Valve is Off
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Activate / Active Test the VSV for ACIS

      Powertrain > Engine > Active Test 

      Tester Display
      Activate the VSV for AICS
    5. Check for operation of the VSV when the VSV is operated using the Techstream.

      Standard

      Techstream Connection Specified Condition
      ON Air from port E flows out through port F
      OFF Air from port E flows out through the air filter

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [10/2015 - 05/2018]  , or refer to  PROBLEM SYMPTOMS TABLE [05/2018 - ] 

    Result: 

    NG 

    See step  2

  2. INSPECT AIR CLEANER CASE SUB-ASSEMBLY (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)) 
    1. Inspect the air cleaner case sub-assembly (vacuum switching valve assembly (for AICV)).

      Refer to PROCEDURE - Step 4

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE AIR CLEANER CASE SUB-ASSEMBLY (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)) 

    Result: 

    OK 

    See step  3

  3. CHECK TERMINAL VOLTAGE (POWER SOURCE OF AIR CLEANER CASE SUB-ASSEMBLY (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))) 
    GTY638374Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Air Cleaner Case Sub-assembly (Vacuum Switching Valve Assembly (for AICV))
    1. Disconnect the air cleaner case sub-assembly (vacuum switching valve assembly (for AICV)) connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value (s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A27-2 - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (AIR CLEANER CASE SUB-ASSEMBLY (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV)) - ECM) 
    1. Disconnect the A27 air cleaner case sub-assembly (vacuum switching valve assembly (for AICV)) connector.
    2. Disconnect the E1 ECM connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A27-1 - E1-7 (AICV) Always Below 1 Ω
      A27-1 or E1-7 - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT AIR CLEANER ASSEMBLY (VACUUM SURGE TANK) 
    1. Inspect the vacuum surge tank.

      Refer to PROCEDURE - Step 3

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM. Refer to  REMOVAL [10/2015 - 09/2017]  , or refer to  REMOVAL [09/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE AIR CLEANER ASSEMBLY 

  6. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AIR CLEANER CASE SUB-ASSEMBLY (VACUUM SWITCHING VALVE ASSEMBLY (FOR AICV))) 
    1. Remove the No. 1 integration relay from No. 2 engine room relay block.
    2. Disconnect the A27 air cleaner case sub-assembly (vacuum switching valve assembly (for AICV)) connector.
    3. Measure the resistance according to the value (s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2E-14 - A27-2 Always Below 1 Ω
      2E-14 or A27-2 - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [10/2015 - 09/2017]  , or refer to  REMOVAL [09/2017 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals