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MIL Circuit [08/2015 - 08/2017]: Procedure

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK THAT MIL IS ILLUMINATED 
    1. Perform troubleshooting in accordance with the table below.
      RESULT

      Result Proceed to
      MIL remains ON A
      MIL does not illuminate B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK WHETHER MIL TURNS OFF 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream ON.
    3. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    4. Check if any DTCs have been stored. Note down any DTCs.
    5. Clear DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2018] ).
    6. Check if the MIL goes off.

      Standard

      MIL goes off

    Result: 

    OK 

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

    (Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 10/2016] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2016 - 08/2017] )

    Result: 

    NG 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
    GTY595870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A27 ECM connector.
    2. Turn the ignition switch to ON.
    3. Check that the MIL is not illuminated.

      OK

      MIL is not illuminated.

    Result: 

    OK 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

    Result: 

    NG 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    1. Disconnect the A27 ECM connector.
    2. Disconnect the H37 combination meter connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A27-24 (W) or H37-5 (CHK) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE COMBINATION METER 

    (Refer to REMOVAL [08/2015 - 08/2017] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK THAT MIL IS ILLUMINATED 
    1. Check if the MIL is illuminated when the ignition switch is turned to ON.

      OK

      MIL should be illuminated.

    Result: 

    OK 

    SYSTEM OK 

    Result: 

    NG 

    See step  6

  6. CHECK THAT ENGINE STARTS 
    1. Turn the ignition switch to ON.
    2. Start the engine.
      RESULT

      Result Proceed to
      Engine starts A
      Engine does not start* B

      HINT: 

      *: The Techstream cannot communicate with the ECM.

    Result: 

    B 

    GO TO VC OUTPUT CIRCUIT 

    (Refer to VC Output Circuit [08/2015 - 08/2017] )

    Result: 

    A 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    1. Disconnect the A27 ECM connector.
    2. Disconnect the H37 combination meter connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A27-24 (W) - H37-5 (CHK) Always Below 1 Ω

    Result: 

    OK 

    REPLACE COMBINATION METER 

    (Refer to REMOVAL [08/2015 - 08/2017] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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