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Inspection Procedure

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

      Result 

      RESULT CHART

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

    B:  Go to 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 (see DTC CHECK/CLEAR ). If DTCs are present, write them down.
    4. Clear the DTCs (see DTC CHECK/CLEAR ).
    5. Check that the MIL turns off.

      OK: MIL turns off. 

    OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (See DIAGNOSTIC TROUBLE CODE CHART )

    NG: Go to next step 

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

      OK: MIL is not illuminated. 

    4. Reconnect the ECM connector.

    OK: REPLACE ECM  (See REMOVAL  )

    Fig 1: Disconnecting A8 ECM Connector
    G05804037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to next step 

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

      Standard resistance (check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connection Condition Specified Condition
      K31-8 (EFI) - A6-8 (W) Always Below 1 Ω

      Standard resistance (check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connection Condition Specified Condition
      K31-8 (EFI) or A6-8 (W) - Body ground Always 10 kΩ or higher
    4. Reconnect the combination meter connector and ECM connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 2: Checking Harness And Connector (Combination Meter - ECM)
    G05804038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPAIR OR REPLACE COMBINATION METER 

  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: END 

    NG: Go to next step 

  6. CHECK THAT ENGINE STARTS 
    1. Start the engine.

      Result 

      RESULT CHART

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

    B:  GO TO VC OUTPUT CIRCUIT 

    A: Go to next step 

  7. INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT) 
    1. See the combination meter troubleshooting procedure (see INITIALIZATION ).

    NG: REPAIR OR REPLACE COMBINATION METER ASSEMBLY 

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

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