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Home >> Lexus >> 2006 >> GX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - System And Circuit Testing, On-Vehicle Inspection, Removal, Inspection, Installation >> VC Output Circuit >> Inspection Procedure
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Inspection Procedure

  1. CHECK MIL 
    1. Check that the Malfunction Indicator Lamp (MIL) lights up when turning the ignition switch ON.

      OK: 

      MIL lights up 

    OK: SYSTEM OK 

    NG: Go to next step 

  2. CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM 
    1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
    2. Turn the ignition switch ON and intelligent tester ON.
    3. Check the communication between the intelligent tester and ECM.

      Result 

      RESULT REFERENCE

      Condition Proceed to
      Communication is possible A
      Communication is impossible B

    A: GO TO  MIL CIRCUIT  

    B: Go to next step 

  3. INSPECT ECM 
    1. Turn the ignition switch ON.
      2. Fig 1: Identifying E5 Connector Terminal & E4 Connector Terminal
      G05264279Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Measure the voltage between E5-23 (VC) and E7-1 (E1) of the ECM connectors.

      Standard voltage: 

      Voltage is not 5 V 

  4. CHECK MIL (THROTTLE POSITION SENSOR) 
    1. Disconnect the T2 throttle body connector.
    2. Turn the ignition switch ON.
    3. Check the MIL

      Result 

      RESULT REFERENCE

      Condition Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE THROTTLE BODY 

    B: Go to next step 

  5. CHECK MIL (CAMSHAFT POSITION SENSOR) 
    1. Disconnect the C1 camshaft position sensor connector.
    2. Turn the ignition switch ON.
    3. Check the MIL

      Result 

      RESULT REFERENCE

      Condition Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE CAMSHAFT POSITION SENSOR 

    B: Go to next step 

  6. CHECK MIL (CANISTER PUMP MODULE) 
    1. Remove the spare tire.
      2. Fig 2: Identifying L4 Canister Pump Module Connector
      G04968181Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    2. Disconnect the L4 canister pump module connector.
    3. Turn the ignition switch ON.
    4. Check the MIL

      Result 

      RESULT REFERENCE

      Condition Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE CANISTER 

    B: Go to next step 

  7. CHECK MIL (PRESSURE SENSOR) 
    1. Remove the intake manifold (see REMOVAL ).
    2. Disconnect the A45 pressure sensor.
    3. Turn the ignition switch ON.
    4. Check the MIL

      Result 

      RESULT REFERENCE

      Condition Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE AIR SWITCHING VALVE 

    B: Go to next step 

  8. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the T2 throttle body connector.
    2. Disconnect the C1 camshaft position sensor connector.
    3. Disconnect the L4 canister pump module connector.
    4. Disconnect the A45 pressure sensor.
      5. Fig 3: Identifying E5 ECM Connector Terminals
      G05264281Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
    5. Disconnect the E5 ECM connector.
    6. Measure the resistance of the wire harness side connector.

      Standard resistance (check for short) 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      VC (E5-23) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

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