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Home >> Scion >> 2014 >> iQ Base >> Repair and Diagnosis (Single Page) >> Steering >> Manual Steering >> Power Steering System (Diagnostics - Introduction) >> Power Steering System >> How To Proceed With Troubleshooting [05/2013 - ] >> How To Proceed With Troubleshooting [05/2013 - ]

How To Proceed With Troubleshooting [05/2013 - ]

HINT: 

  1. VEHICLE BROUGHT TO WORKSHOP 

    NEXT: Go to next step 

  2. INSPECT BATTERY VOLTAGE 

    Standard voltage

    11 to 14 V

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

    NEXT: Go to next step 

  3. CHECK DTC AND FREEZE FRAME DATA* 
    1. Refer to DTC Check/Clear. Refer to DTC CHECK / CLEAR [05/2013 - ] .

      NEXT: Go to next step 

  4. PROBLEM SYMPTOM CONFIRMATION 

    NEXT: Go to next step 

  5. CHECK CAN COMMUNICATION SYSTEM* 
    1. Refer to DTC output for the CAN communication system. Refer to DIAGNOSIS SYSTEM [05/2013 - ] .
      RESULT

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

      HINT: 

      • When any CAN communication system DTCs are output, perform troubleshooting on the CAN communication system first.
      • When communication to the power steering ECU is not established through the Techstream, inspect terminals CANH and CANL of the DLC3 and the power steering ECU, and the IG circuit of the power steering ECU.

      B → PROCEED TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2013 - ] 

      A: Go to next step 

  6. CHECK DTC* 
    1. Refer to DTC Check/Clear. Refer to DTC CHECK / CLEAR [05/2013 - ] .
      RESULT

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

      B → Go to step 9 

      A: Go to next step 

  7. PROBLEM SYMPTOMS TABLE 
    1. Refer to Problem Symptoms Table. Refer to PROBLEM SYMPTOMS TABLE [05/2013 - ] .
      RESULT

      Result Proceed to
      Fault is not listed in Problem Symptoms Table A
      Fault is listed in Problem Symptoms Table B

      B → Go to step 9 

      A: Go to next step 

  8. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Refer to Terminals of ECU. Refer to TERMINALS OF ECU [05/2013 - ] .
    2. Refer to Data List/Active Test. Refer to DATA LIST / ACTIVE TEST [05/2013 - ] .

      NEXT: Go to next step 

  9. REPAIR OR REPLACE 

    NEXT: Go to next step 

  10. CONFIRMATION TEST 

    NEXT → END