POWER STEERING SYSTEM HOW TO PROCEED WITH TROUBLESHOOTING

Tech Tips


  • Use these procedures to troubleshoot the power steering system.

  • *: Use the intelligent tester.


  1. VEHICLE BROUGHT TO WORKSHOP


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  2. INSPECT AUXILIARY BATTERY VOLTAGE

    Standard voltage
    11 to 14 V

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


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  3. CHECK DTC AND FREEZE FRAME DATA*


    1. Record DTCs and freeze frame data.


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  4. CLEAR DTC AND FREEZE FRAME DATA*


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  5. PROBLEM SYMPTOM CONFIRMATION

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

    B

    Go to step 7
    A

  6. SYMPTOM SIMULATION


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  7. CHECK DTC*


    1. Check for DTCs Click here.

    2. Delete DTCs.

    3. Recheck for DTCs.

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

      Tech Tips


      • Refer to the diagnostic trouble code chart if any DTCs are output.

      • If any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first (for LHD: Click here, for RHD: Click here.

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


      B

      Go to step 9
      A

  8. PROBLEM SYMPTOMS TABLE


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  9. CIRCUIT INSPECTION


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  10. IDENTIFICATION OF PROBLEM


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  11. REPAIR OR REPLACE


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  12. CONFIRMATION TEST


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    END