POWER STEERING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use the following procedure to troubleshoot the power steering system.

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. CUSTOMER PROBLEM ANALYSIS


    1. Confirm problem symptoms Click here.


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  3. INSPECT AUXILIARY BATTERY VOLTAGE


    1. Measure the voltage of the auxiliary battery.

      Standard Voltage
      11 to 14 V

      If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.

    2. Using the intelligent tester, inspect auxiliary battery voltage reduction history "Batt Vo Low" in the Data List Click here.


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  4. CHECK DTC AND FREEZE FRAME DATA*


    1. Record DTCs and freeze frame data.


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  5. CLEAR DTC AND FREEZE FRAME DATA*


    1. Clear the DTCs and freeze frame data.


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  6. PROBLEM SYMPTOM CONFIRMATION

    Result
    Result Proceed to
    Symptom does not occur. A
    Symptom occurs. B

    B
    A
  7. SYMPTOM SIMULATION


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  8. CHECK CAN COMMUNICATION SYSTEM*


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      CAN system DTC is not output. A
      CAN system DTC is output. B

      Tech Tips


      • If any DTCs of the CAN communication system are output, perform troubleshooting on the CAN communication system first.

      • If communication to the power steering ECU cannot be established through the intelligent tester, inspect terminals CANH and CANL of the DLC3 and the power steering ECU, and the IG circuit of the power steering ECU.


      B
      A
  9. CHECK FOR DTC*


    1. Check for DTCs Click here.

      Tech Tips

      Refer to Diagnostic Trouble Code Chart when any DTCs are output Click here.

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

      B
      A
  10. PROBLEM SYMPTOMS TABLE


    1. Refer to Problem Symptoms Table Click here.


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  11. CIRCUIT INSPECTION


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  12. IDENTIFICATION OF PROBLEM


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  13. REPAIR OR REPLACE


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  14. CONFIRMATION TEST


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