HYBRID BATTERY SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • *: Use the intelligent tester

  • Use the following procedure to troubleshoot the hybrid battery system.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS


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  3. CONNECT INTELLIGENT TESTER TO THE DLC3*

    Tech Tips

    If the display on the tester indicates a communication fault, inspect the DLC3.


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  4. CHECK DTC AND SAVE FREEZE FRAME DATA* Click here, Click here

    Tech Tips


    • Make sure to save freeze frame data because the data is necessary for a simulation test.

    • For the hybrid vehicle control system, there are many DTCs, many of which can be stored due to a single malfunction. As a result, in some of the diagnosis procedures an instruction is provided to check for other DTCs and their corresponding INF codes. By following the diagnosis path based on the combination of output DTCs and INF codes, it is possible to narrow down the problem early and avoid unnecessary diagnosis.


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  5. CLEAR DTC AND FREEZE FRAME DATA* Click here


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  6. CONDUCT VISUAL INSPECTION


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  7. CONFIRM PROBLEM SYMPTOMS

    Tech Tips

    If the engine does not start, perform steps 9 and 11 first.

    Result
    Result Proceed to
    Malfunction does not occur A
    Malfunction occurs B

    B

    GO TO STEP 10
    A

  8. DUPLICATE CONDITIONS THAT PRODUCE SYMPTOMS


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  9. CHECK FOR DTCS* Click here

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

    B

    GO TO STEP 11
    A

  10. REFER TO DTC CHART Click here


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    GO TO STEP 13

  11. CONDUCT BASIC INSPECTION

    Result
    Result Proceed to
    Malfunctioning parts not confirmed A
    Malfunctioning parts confirmed B

    B

    GO TO STEP 15
    A

  12. CHECK ECU POWER SOURCE CIRCUIT


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  13. CONDUCT CIRCUIT INSPECTION

    Result
    Result Proceed to
    Malfunction not confirmed A
    Malfunction confirmed B

    B

    GO TO STEP 16
    A

  14. CHECK FOR INTERMITTENT PROBLEMS Click here


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    GO TO STEP 16

  15. CONDUCT PARTS INSPECTION


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  16. IDENTIFY PROBLEM


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  17. ADJUST AND/OR REPAIR


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  18. CONDUCT CONFIRMATION TEST


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    END