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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Engine Control System (1AR-FE) (Diagnostic Codes (P1604 - U0101) & Circuit Tests)) >> SFI System >> MIL Circuit >> Procedure

MIL Circuit: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK THAT MIL IS ILLUMINATED 
    1. Turn the ignition switch to ON.
    2. Check the illumination of the MIL.

      Result

      Result Proceed to
      MIL remains illuminated (Even after ignition switch is turned to ON and several seconds have passed, MIL still remains illuminated) A
      MIL remains off (Does not illuminate at all) B

    B → See step   5 

    A: Go to next step 

  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 / Trouble Code.
    4. Check if any DTCs have been stored. Note down any DTCs.
    5. Clear the DTCs, refer to DTC CHECK / CLEAR .
    6. Check if the MIL goes off.

      OK

      MIL goes off.

    NG → See step   3 

    OK → See step   8 

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
    1. Disconnect the ECM connector.
      Fig 1: Disconnecting ECM D60 Connector
      GTY173711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Check that the MIL is not illuminated.

      OK

      MIL is not illuminated.

    4. Reconnect the ECM connector.

    NG → See step   4 

    OK → See step   9 

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

      Standard Resistance (Check for Short)

      Tester Connection Condition Specified Condition
      D60-18 (W) or E1-10 (CHK) - Body ground Always 10 kΩ or higher
    4. Reconnect the ECM connector.
    5. Reconnect the combination meter assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  5. 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.

    B → See step   11 

    A: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BODY GROUND) 
    1. Disconnect the ECM connector.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D60-18 (W) - Body ground Ignition switch ON 11 to 14 V
    4. Reconnect the ECM connector.

    NG → See step   7 

    OK → See step   9 

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

      Standard Resistance (Check for Open)

      Tester Connection Condition Specified Condition
      D60-18 (W) - E1-10 (CHK) Always Below 1 Ω
    4. Reconnect the ECM connector.
    5. Reconnect the combination meter assembly connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

  8. REPAIR CIRCUITS INDICATED BY OUTPUT DTCS. Refer to  DIAGNOSTIC TROUBLE CODE CHART 
  9. REPLACE ECM. Refer to  REMOVAL 
  10. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL 
  11. GO TO VC OUTPUT CIRCUIT. Refer to  VC Output Circuit  
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