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MIL Circuit: 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 power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
    5. Check if any DTCs have been detected. Note down any DTCs.
      RESULT

      Result Proceed to
      DTC is not detected A
      Any DTCs are detected B

      HINT: 

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

    B → REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

    A: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
    1. Disconnect the A22 ECM connector.
      Fig 1: A22 ECM Connector
      GTY397662Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the power 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
      A22-30 (W) or H14-5 (CHK) - 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 power switch is turned on (IG).

      OK

      MIL should be illuminated.

    NG → See step   6 

    OK → See step   10 

  6. CHECK THAT ENGINE STARTS 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in inspection mode (maintenance mode). Refer to INSPECTION MODE PROCEDURE [06/2012 - ] .
    5. 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   11 

    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
      A22-30 (W) - H14-5 (CHK) Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   12 

  8. REPLACE ECM. Refer to  REMOVAL [06/2012 - ] 
  9. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2012 - ] 
  10. CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [06/2012 - ] 
  11. GO TO VC OUTPUT CIRCUIT. Refer to  VC Output Circuit  
  12. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [06/2012 - ] 
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