LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> IS 250 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (4GR-FSE) - System And Circuit Testing, On-Vehicle Inspection, Removal, Inspection & Installation >> ACIS Control Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE INTAKE AIR CONTROL VALVE) 
    1. Connect the intelligent tester to the DLC3.
    2. Start the engine and turn the tester on.
    3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / INTAKE CTL VSV1.
    4. Check if operating noise can be heard when operating the intake control valve using the intelligent tester.

      OK: 

      Operating noise can be heard. 

    OK: CHECK FOR INTERMITTENT PROBLEMS 

    NG: Go to next step 

  2. CHECK AIR INTAKE VALVE (OPERATION) 
    1. Disconnect the air intake valve connector.
    2. Apply battery voltage between the terminals of the air intake valve connector.
    3. Check air intake valve operation.

      OK: 

      Operating noise can be heard. 

    NG: REPLACE INTAKE AIR SURGE TANK 

    Fig 1: Identifying Air Intake Valve Connector Terminals
    G05316628Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (VSV FOR ACIS - ECM, VSV FOR ACIS - EFI NO. 2 FUSE) 
    1. Check the wire harness between the intake air control connector and the ECM connector.
      1. Disconnect the air intake valve connector.
      2. Disconnect the E5 ECM connector.
      3. Measure the resistance according to the value (s) in the table below.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION

        Tester Connection Specified Condition
        Intake air control valve (E50-2) - ACIS (E5-3) Below 1 Ω

        Standard resistance (Check for short) 

        RESISTANCE SPECIFICATION

        Tester Connection Specified Condition
        Intake air control valve (E50-2) or ACIS (E5-3) - Body ground 10 kΩ or higher
    2. Check the wire harness between the intake air control connector and the EFI No. 2 fuse.
      1. Disconnect the air intake valve connector.
      2. Remove the EFI No. 2 fuse from the engine room J/ B and R/B No. 2.
      3. Measure the resistance according to the value (s) in the table below.

        Standard resistance (Check for open) 

        RESISTANCE SPECIFICATION

        Tester Connection Specified Condition
        Intake air control valve (E50-1) - EFI No. 2 fuse (2) of Engine room No. 2 relay block Below 1 Ω
        Fig 2: Identifying E5 ECM Connector
        G05316629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

scientia non olet · About LEMON Manuals