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Home >> Lexus >> 2003 >> ES 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 161 (Engine Control System (SFI) (1MZ-FE-3MZ-FE) - Diagnostics) >> Air Intake Control Circuit >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

Hand-held Tester: 

  1. READ VALUE OF HAND-HELD TESTER (VSV FOR IAC VALVE NO. 3) 
    1. Turn the ignition switch ON and push the hand-held tester main switch ON.
    2. Enter the following menus: DIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/INTAKE CTL VSV1. Operate the VSV.
    3. Check the operation of the VSV when the VSV is operated by the hand-held tester.

      Standard: 

      VSV OPERATION CONDITIONS

      Tester Operation Specified Condition
      VSV is ON Air from port E flows out through port F
      VSV is OFF Air from port E flows out through the air filter
      Fig 1: Checking Operation Of VSV
      G02900694Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. OK: Go to step   4 
    2. NG: Go to next step. 
  2. CHECK VSV (See  INTAKE  ) 
    1. NG: REPLACE INTAKE AIR CONTROL VALVE ASSY NO.3 
    2. OK: Go to next step. 
  3. CHECK WIRE HARNESS (VSV FOR IAC VALVE NO. 3 - ECM, VSV FOR IAC VALVE NO. 3 - EFI RELAY) 
    1. Check the wire harness between the VSV and ECM.
      1. Disconnect the V3 VSV connector for AICV.
      2. Disconnect the E 10 ECM connector.
      3. Check the resistance of the wire harness side connectors.

      Standard: 

      VSV CONNECTOR FOR AICV RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      V3-1 - E10-33 (AICV) Below 1 Ω
      V3-1 or E10-33 (AICV) - Body ground 10 kΩ or higher
      Fig 2: Identifying VSV For IAC Valve No.3 Connector Terminals
      G02900695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the wire harness between the VSV and EFI relay.
      1. Disconnect the V3 VSV connector for AICV.
      2. Remove the EFI relay from the engine room J/B.
      3. Check the resistance of the wire harness side connectors.

      Standard: 

      VSV AND EFI RELAY CONNECTOR TERMINALS RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      VSV for AICV (V3-2) - J/B EFI relay terminal 3 Below 1Ω
      Fig 3: Identifying EFI Relay Connector Terminals
      G02900696Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to next step 
  4. INSPECT VACUUM TANK (See  INTAKE  ) 
    1. NG: REPAIR OR REPLACE 
    2. OK: REPLACE ECM (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ). 

OBDII scan tool (excluding Hand-held tester): 

  1. CHECK VSV FOR AICV (See  INTAKE  ) 
    1. NG: REPLACE INTAKE AIR CONTROL VALVE ASSY NO.3 
    2. OK: Go to next step 
  2. INSPECT ECM 
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connectors.

      Voltage: 

      ECM CONNECTORS VOLTAGE SPECIFICATION

      Tester Connection Specified Condition
      E10-33 (AICV) - E8-1 (E1) 9 to 14 V
      Fig 4: Identifying ECM Connectors
      G02900697Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: Go to next step 
  3. INSPECT VACUUM TANK (See  INTAKE  ) 
    1. NG: REPAIR OR REPLACE 
    2. OK: Go to next step 
  4. CHECK WIRE HARNESS (VSV FOR IAC VALVE NO. 3 - ECM, VSV FOR IAC VALVE NO. 3 - EFI RELAY) 
    1. Check the wire harness between the VSV and ECM.
      1. Disconnect the V3 VSV connector for AICV.
      2. Disconnect the E10 ECM connector.
      3. Check the resistance of the wire harness side connectors.

      Standard: 

      VSV CONNECTOR RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      V3-1 - E10-33 (AICV) Below 1Ω
      V3-1 or E10-33 (AICV) - Body ground 10 kΩ or higher
      Fig 5: Identifying VSV For IAC Valve No. 3 - ECM Connector Terminals
      G02900698Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the wire harness between the VSV and EFI relay.
      1. Disconnect the V3 VSV connector for AICV.
      2. Remove the EFI relay from the engine room J/B.
      3. Check the resistance of the wire harness side connectors.

      Standard: 

      VSV And EFI Relay Harness Side Connector Resistance Specification

      Tester Connection Specified Condition
      VSV for AICV (V3-2) - J/B EFI relay terminal 3 Below 1 Ω
      Fig 6: Identifying VSV And EFI Relay Harness Side Connector
      G02900699Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 
    2. OK: REPLACE ECM (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ). 
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