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Inspection Procedure

  1. CHECK MIL 
    1. Check that MIL lights up when turning the ignition switch.

    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

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

    B: GO TO  MIL CIRCUIT  

    A: GO TO NEXT STEP 

  3. CHECK ECM (VC1 VOLTAGE) 
    1. Turn the ignition switch ON.
    2. Measure the voltage of the ECM connector.
    Fig 1: Measuring Voltage Of ECM Connector
    G04067665Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Result: 

    Voltage is not 5 V 

    NEXT 

  4. CHECK MIL (THROTTLE POSITION SENSOR) 
    1. Disconnect the T20 throttle body connector.
    2. Turn the ignition switch ON.
    3. Check the MIL.

    Result 

    RESULT

    Condition Proceed to
    MIL does not illuminate A
    RESULT

    Condition Proceed to
    MIL illuminates B

    B: REPLACE THROTTLE BODY ASSEMBLY 

    A: GO TO NEXT STEP 

  5. CHECK MIL (CANISTER PUMP MODULE) 
    1. Disconnect the L18 canister pump module connector.
    2. Turn the ignition switch ON.
    3. Check the MIL.

    Result 

    RESULT

    Condition Proceed to
    MIL does not illuminate A
    MIL illuminates B

    B: REPLACE CANISTER 

    A: GO TO NEXT STEP 

  6. CHECK WIRE HARNESS (ECM - BODY GROUND) 
    1. Disconnect the T20 throttle body connector.
    2. Disconnect the L18 canister pump module connector.
    3. Disconnect the E5 ECM connector.
    4. Measure the resistance of the wire harness connector.

    Standard resistance 

    TESTER CONNECTION SPECIFIED CONDITION

    Tester Connection Specified Condition
    E5-29 (VC1) - Body ground 10 kΩ or higher
    Fig 2: Disconnecting E5 ECM Connector
    G04067666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE ECM 

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