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Home >> Toyota >> 2009 >> Sienna LE, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System - System & Component Testing, On-Vehicle Inspection, Removal, Inspection & Installation >> MIL Circuit >> Inspection Procedure
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Inspection Procedure

  1. CHECK THAT MIL IS ILLUMINATED 
    1. Turn the ignition switch to the ON position.
    2. Check the illumination of the MIL.

      Result 

      RESULT REFERENCE

      Result Proceed to
      MIL remains illuminated (Even after ignition switch is turned to ON position and several seconds have passed, MIL still remains illuminated) A
      MIL remains off (Does not illuminate at all) B
      MIL illuminates for several seconds, but turns off after engine is started C

    B:  Go to step  5

    C: SYSTEM OK 

    A: Go to next step. 

  2. CHECK WHETHER MIL TURNS OFF 
    1. Connect Techstream to the DLC3.
    2. Turn the ignition switch to the ON position and turn the tester on.
    3. Select the following menu items: Powertrain / Engine and ECT / Trouble Code.
    4. Check if any DTCs have been stored. Note down any DTCs.
    5. Clear the DTCs (See DTC CHECK / CLEAR ).
    6. Check if the MIL goes off.

      Standard: MIL goes off. 

    OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

    NG: Go to next step. 

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
    1. Disconnect the E5 ECM connector.
      2. Fig 1: Identifying E5 ECM Connector
      G05136334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to the ON position.
    3. Check that the MIL is not illuminated.

      OK: MIL is not illuminated. 

    4. Reconnect the ECM connector.

    OK: REPLACE ECM  (See REMOVAL  )

    NG: Go to next step. 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    1. Disconnect the E5 ECM connector.
    2. Disconnect the C10 combination meter connector.
      3. Fig 2: Identifying C10 Combination Meter Connector
      G05136335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance (Check for open) 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      W (E5-30) - C10-8 Bellow 1 Ω

      Standard resistance (Check for short) 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      W (E5-30) or C10-8 - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the combination meter connector.

    OK: REPLACE COMBINATION METER ASSEMBLY 

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM) 

  5. CHECK THAT ENGINE STARTS 
    1. Turn the ignition switch to the ON position.
    2. Start the engine.

      Result 

      RESULT REFERENCE

      Result Proceed to
      Engine starts A
      Engine does not start* B
      HINT:
      *: Techstream cannot communicate with the ECM.

    B: GO TO VC OUTPUT CIRCUIT 

    A: Go to next step. 

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BODY GROUND) 
    1. Disconnect the E5 ECM connector.
      2. Fig 3: Identifying E5 ECM Connector
      G05136336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to the ON position.
    3. Measure the voltage according to the value (s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATIONS

      Tester Connection Condition Specified Condition
      W (E5-30) - Body ground Ignition switch ON 11 to 14 V
    4. Reconnect the ECM connector.

    OK: REPLACE ECM  (See REMOVAL  )

    NG: Go to next step. 

  7. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    1. Disconnect the E5 ECM connector.
    2. Disconnect the C10 combination meter connector.
      3. Fig 4: Identifying C10 Combination Meter Connector
      G05136335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value (s) in the table below.

      Standard resistance (Check for short) 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      W (E5-30) - C10-8 Bellow 1 Ω

      Standard resistance (Check for Short) 

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Specified Condition
      W (E5-30) or C10-8 - Body ground 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the combination meter connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER ECM) 

    OK: REPLACE COMBINATION METER ASSEMBLY 

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