Lexus IS250 · Service Manual ENGINE

HOW TO PROCEED WITH TROUBLESHOOTING

Troubleshooting

HINT:
  1. Use these procedures to troubleshoot the push-button start function.
  2. The intelligent tester should be used in steps 4, 5 and 8.


1.VEHICLE BROUGHT TO WORKSHOP
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    2.CUSTOMER PROBLEM ANALYSIS CHECK

      HINT:
      1. In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
      2. Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.

      1. The following 5 items are important points in the problem analysis:
        What
        		 Vehicle model, system name
        When
        		 Date, time, occurrence frequency
        Where
        		 Road conditions
        Under what conditions?
        		 Running conditions, driving conditions, weather conditions
        How did it happen?
        		 Problem symptoms
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    3.INSPECT BATTERY VOLTAGE

      Standard Voltage:
      11 to 14 V

      If the voltage is below 11 V, recharge or replace the battery before proceeding.
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    4.INSPECT COMMUNICATION FUNCTION OF MULTIPLEX COMMUNICATION SYSTEM (BEAN)

    1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally (Click here).

      Result:
      Result
      		 Proceed to
      MPX DTC is not output
      		 A
      MPX DTC is output
      		 B


    		B.
    A

    5.CHECK FOR DTC

    1. Check for DTC and note any codes that are output (Click here).

    2. Delete DTC.

    3. Recheck DTC.

      Result:
      Result
      		 Proceed to
      DTC does not reoccur
      		 A
      DTC reoccurs
      		 B


    		B.
    A

    6.INSPECT BASIC OPERATION

    1. Turn the engine switch on (START) and check that the engine starts normally. Make sure the brake pedal is depressed and the shift position is in P at this time.

    2. Check that the engine switch mode can be changed by pushing the engine switch.

      HINT:
      Without depressing the brake pedal, push the engine switch repeatedly. Engine switch mode should turn from off to on (ACC) to on (IG) and back to off.
      With the brake pedal depressed, push the engine switch repeatedly. Engine switch mode should turn to ENGINE START from any status.

      OK:
      Engine can start normally.

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    7.PROBLEM SYMPTOMS TABLE

      Result:
      Result
      		 Proceed to
      Fault is not listed in the problem symptoms table
      		 A
      Fault is listed in the problem symptoms table
      		 B


    		B.
    A

    8.OVERALL ANALYSIS AND TROUBLESHOOTING

    1. Terminals of ECU (Click here)

    2. DATA LIST/ACTIVE TEST (Click here)

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    9.REPAIR OR REPLACE
      NEXT

      10.CONFIRMATION TEST
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