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DTC C123A-17: Supply Voltage Circuit Voltage Above Threshold [11/2023 - ]: Procedure

  1. CHECK VEHICLE SPECIFICATION 

    Result

    Result Proceed to
    w/o Stop and Start System A
    w/ Stop and Start System B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (IG POWER SOURCE) 
    1. Disconnect the C67 rack and pinion power steering gear assembly connector.
      GTY1177841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)      		 - -
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C67-4 (IG) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CLEAR DTC 
    1. Clear the DTCs.

      Chassis > EMPS > Clear DTCs 

      Result

      Proceed to
      NEXT
    2. Turn the ignition switch off.

    Result: 

    NEXT 

    See step  4

  4. CHECK FOR DTC 

    Chassis > EMPS > Trouble Codes 

    Result

    Result Proceed to
    DTCs are output A
    DTCs are not output B

    Result: 

    A 

    REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

  5. CHECK HARNESS AND CONNECTOR (IG POWER SOURCE) 
    1. Disconnect the C67 rack and pinion power steering gear assembly connector.
      GTY1177841Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rack and Pinion Power Steering Gear Assembly)      		 - -
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      C67-4 (IG) - Body ground Ignition switch ON 10.5 to 16 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT). Refer to  Backup Boost Converter Circuit [11/2023 - ] 

    Result: 

    OK 

    See step  6

  6. CLEAR DTC 
    1. Clear the DTCs.

      Chassis > EMPS > Clear DTCs 

      Result

      Proceed to
      NEXT
    2. Turn the ignition switch off.

    Result: 

    NEXT 

    See step  7

  7. CHECK FOR DTC 
    1. Check for DTCs.

      Chassis > EMPS > Trouble Codes 

      Result

      Result Proceed to
      DTCs are output A
      DTCs are not output B

    Result: 

    A 

    REPLACE RACK AND PINION POWER STEERING GEAR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

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