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Home >> Lexus >> 2012 >> IS 350 Base, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P060A-U0101) & Circuit Tests) >> SFI System >> Circuit Tests >> MIL Circuit >> Procedure
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MIL Circuit: Procedure

  1. CHECK MIL CONDITION (WHETHER MIL TURNS OFF) 
    1. Connect Techstream to the DLC3.
    2. Turn the engine switch on (IG).
    3. Turn the tester on.
    4. Check whether any DTCs have been stored. Refer to DTC CHECK / CLEAR . Note them down if necessary.
    5. Clear DTCs. Refer to DTC CHECK / CLEAR .
    6. Check if the MIL turns off.

      OK

      MIL turns off.

    OK → REPAIR CIRCUIT INDICATED BY OUTPUT DTC 

    NG: Go to next step 

  2. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) 
    1. Disconnect the A6 ECM connector.
    2. Turn the engine switch on (IG).
    3. Check the MIL is not illuminated.

      OK

      MIL is not illuminated.

    4. Reconnect the ECM connector.

    OK → See step   7 

    NG: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    1. Disconnect the A6 ECM connector.
    2. Disconnect the J35 combination meter connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      W (A6-8) - EFI (J35-12) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      W (A6-8) or EFI (J35-12) - Body ground 10 kΩ or higher
    4. Reconnect the combination meter connector.
    5. Reconnect the ECM connector.

    OK → REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  4. CHECK MIL (MIL IS ILLUMINATED) 
    1. Check if the MIL is illuminated when the engine switch is turns on (IG).

      OK

      MIL is illuminated.

    OK → SYSTEM IS OK 

    NG: Go to next step 

  5. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the A6 ECM connector.
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Specified Condition
      W (A6-8) - Body ground 10 to 14 V
    4. Reconnect the ECM connector.

    OK → See step   8 

    NG: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) 
    1. Disconnect the A6 ECM connector.
    2. Disconnect the J35 combination meter connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      W (A6-8) - EFI (J35-12) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      W (A6-8) or EFI (J35-12) - Body ground 10 kΩ or higher
    4. Reconnect the combination meter connector.
    5. Reconnect the ECM connector.

    OK → REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. REPLACE ECM. Refer to  REMOVAL 
  8. REPLACE ECM. Refer to  REMOVAL 
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