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Home >> Lexus >> 2011 >> LS 460L AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P1603-U0319) & Circuit Tests) >> SFI System >> MIL Circuit >> Procedure

MIL Circuit: Procedure

  1. CHECK THAT MIL IS ILLUMINATED 
    1. Perform troubleshooting in accordance with the chart below.

      Result

      Condition Proceed to
      MIL remains on A
      MIL is not illuminated B

    B → See step   5 

    A: Go to next step 

  2. CHECK IF MIL TURNS OFF 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Check if DTCs have been stored. Refer to DTC CHECK / CLEAR . If DTCs are present, write them down.
    4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    5. Check that the MIL turns off.

      OK

      MIL turns off.

    OK → See step   8 

    NG: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
    Fig 1: Identifying A14 ECM Connector
    GTY264503Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the A14 ECM connector.
    2. Turn the engine switch on (IG).
    3. Check that the MIL is not illuminated.

      OK

      MIL is not illuminated.

    OK → See step   9 

    NG: Go to next step 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    Fig 2: Identifying L10 Combination Meter And A14 ECM Connectors
    GTY274802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the L10 combination meter connector.
    2. Disconnect the A14 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (check for open)

      Tester Connection Condition Specified Condition
      L10-11 (EFI) - A14-11 (W) Always Below 1 Ω

      Standard resistance (check for short)

      Tester Connection Condition Specified Condition
      L10-11 (EFI) or A14-11 (W) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   10 

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

      OK

      MIL is illuminated.

    OK → SYSTEM OK 

    NG: Go to next step 

  6. CHECK THAT ENGINE STARTS 
    1. Turn the engine switch on (IG).
    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 

  7. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT) 
    1. See the combination meter troubleshooting procedure. Refer to HOW TO PROCEED WITH TROUBLESHOOTING .

    NG → See step   12 

    OK → CHECK AND REPAIR HARNESS OR CONNECTOR (COMBINATION METER - ECM) 

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