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How To Proceed With Troubleshooting

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

  1. VEHICLE BROUGHT TO WORKSHOP 
  2. CUSTOMER PROBLEM ANALYSIS CHECK AND SYMPTOM CHECK 
  3. INSPECT BATTERY VOLTAGE 

    Standard voltage: 

    11 to 14 V 

    If the voltage is below 11 V, recharge or replace the battery before proceeding.

  4. INSPECT COMMUNICATION FUNCTION OF LARGE-SCALE MULTIPLEX COMMUNICATION SYSTEM (BEAN)* 
    1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

      Result 

      RESULT CHART

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

    B:  GO to MULTIPLEX COMMUNICATION SYSTEM

    A: Go to next step 

  5. CHECK FOR DTC* 
    1. Check for DTCs and note any codes that are output.
    2. Delete the DTCs.
    3. Recheck for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.

      Result 

      RESULT CHART

      Result Proceed to
      DTC does not reoccur A
      DTC reoccurs B

    B: Go to DIAGNOSTIC TROUBLE CODE CHART 

    A: Go to next step 

  6. PROBLEM SYMPTOMS TABLE 

    Result 

    RESULT CHART

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

    B: Go to step  8

    A: Go to next step 

  7. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. (see DATA LIST / ACTIVE TEST  )
    2. (see ON-VEHICLE INSPECTION  )
    3. (see TERMINALS OF ECU  )
  8. ADJUST, REPAIR OR REPLACE 
  9. CONFIRMATION TEST 

    NEXT: END