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Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Tacoma. However, it is still accessible from the selected car via links, so may be relevant.
  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 DLC3.
    2. Turn the ignition switch ON and intelligent tester ON.
    3. Check the communication between the intelligent tester and ECM.
      RESULT SPECIFICATIONS

      Result Proceed to
      Communication is possible A
      Communication is not possible B

    A:  Go TO MIL CIRCUIT 

    B: Go to Next Step 

  3. CHECK MIL (THROTTLE BODY) 
    1. Disconnect the throttle body connector.
    2. Turn the ignition switch ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE THROTTLE BODY 

    B: Go to Next Step 

  4. CHECK MIL (ACCELERATOR PEDAL) 
    1. Disconnect the accelerator pedal connector.
    2. Turn the ignition switch ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE CHART

      Result Proceed to
      MIL Illuminates A
      MIL does not illuminate B

    A: REPLACE ACCELERATOR PEDAL ASSEMBLY 

    B: Go to Next Step 

  5. CHECK MIL (PRESSURE SENSOR FOR SECONDARY AIR INJECTION) 
    1. Disconnect the pressure sensor connector.
    2. Turn the ignition switch ON.
    3. Check the MIL.

      Result 

      RESULT REFERENCE CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE PRESSURE SENSOR 

    B: Go to Next Step 

  6. CHECK MIL (CANISTER PUMP MODULE) 
    1. Disconnect the canister pump module connector.
    2. Turn the ignition switch ON.
    3. Check the MIL

      Result 

      RESULT REFERENCE CHART

      Result Proceed to
      MIL illuminates A
      MIL does not illuminate B

    A: REPLACE CHARCOAL CANISTER ASSEMBLY 

    B: Go to Next Step 

  7. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the throttle body connector.
    2. Disconnect the accelerator pedal connector.
    3. Disconnect the pressure sensor connector.
    4. Disconnect the canister pump module connector.
    5. Disconnect the ECM connector.
    6. Measure the resistance of the wire harness side connector.

      Standard Resistance (check for short) 

      STANDARD RESISTANCE (CHECK FOR SHORT)

      Tester Connection Specified Condition
      VC (E4-18) - Body ground 10 kΩ or higher
      VCPA (E8-26) - Body ground 10 kΩ or higher
      VCP2 (E8-27) - Body ground 10 kΩ or higher
      7. Fig 1: Disconnecting E4 And E8 ECM Connector Terminals
      G05198378Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK : REPLACE ECM 

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