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MIL Circuit [08/2014 - ]: Procedure

  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

    B → See step   5 

    A: Go to next step 

  2. CHECK WHETHER DTC OUTPUT RECURS 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Trouble Codes.
    5. Check if any DTCs have been detected. Note down any DTCs.
      RESULT

      Result Proceed to
      DTC is not output A
      Any DTCs is output B

      HINT: 

      Check for detected DTCs output from other ECUs which relate to the MIL.

    B → REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
    GTY397660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the ECM connector.
    2. Turn the engine switch on (IG).
    3. Check that the MIL is not illuminated.

      OK

      MIL is not illuminated.

      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to ECM)

    NG → See step   4 

    OK → See step   8 

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H14-5 (CHK) or A22-27 (W) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   9 

  5. CHECK THAT MIL IS ILLUMINATED 
    1. Check if the MIL is illuminated when the engine switch is turned on (IG).

      OK

      MIL should be illuminated.

    NG → See step   6 

    OK → See step   12 

  6. CHECK THAT ENGINE STARTS 
    1. Start the engine.
      RESULT

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

      HINT: 

      *: The Techstream cannot communicate with the ECM.

    B → See step   10 

    A: Go to next step 

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H14-5 (CHK) - A22-27 (W) Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   11 

  8. REPLACE ECM. Refer to  REMOVAL [08/2014 - ] 
  9. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2014 - ] 
  10. GO TO VC OUTPUT CIRCUIT. Refer to  VC Output Circuit [08/2014 - ]  
  11. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [08/2014 - ] 
  12. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [08/2014 - ] 
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