POWER STEERING SYSTEM CALIBRATION


  1. TORQUE SENSOR ZERO POINT CALIBRATION (USING GTS)

    Note

    Perform torque sensor zero point calibration if any of the following conditions occur:


    • The power steering ECU assembly has been replaced.

    • The electric power steering column sub-assembly has been replaced.

    • There is a difference in steering effort between turning left and right.


    1. Perform inspection before calibration.


      1. Turn the power switch off.

      2. Connect the GTS to the DLC3.

      3. Turn the power switch on (IG).

      4. Turn the GTS on.

      5. Calibrate the power steering ECU assembly. Enter the following menus: Chassis / EMPS / Data List.

      6. Check the values by referring to the table below.

        EMPS
        Tester Display Measurement Item/Range Normal Condition Diagnostic Note
        IG Power Supply

        IG power source voltage/

        Min.: 0.0000 V

        Max.: 20.1531 V

        		 8 to 16 V Power switch on (IG)

        Note

        If the IG power supply voltage is 8 V or less, calibration cannot be performed. In this case, charge or replace the auxiliary battery, and then perform calibration.

      7. Perform torque sensor zero point calibration.

        Note

        If DTC C1516 (Torque Sensor Zero Point Adjustment Incomplete) is stored, the torque sensor zero point cannot be calibrated. Clear the DTCs before starting calibration.


        1. Set the steering wheel to the center point and align the front wheels straight ahead.

        2. Turn the power switch off.

        3. Connect the GTS to the DLC3.

        4. Turn the power switch on (IG).

        5. Turn the GTS on.

        6. Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.

          Note


          • Do not turn the steering wheel sharply.

          • Do not touch the steering wheel during torque sensor zero point calibration (for 3 seconds).

        7. Check for DTCs Click here.

          Note

          If DTC C1515, C1516, C1534 or C1581 is output, perform troubleshooting for the corresponding DTC.

      8. TORQUE SENSOR ZERO POINT CALIBRATION (USING SST CHECK WIRE)

        Note

        Perform torque sensor zero point calibration if any of the following conditions occur:


        • The power steering ECU assembly has been replaced.

        • The electric power steering column sub-assembly has been replaced.

        • There is a difference in steering effort between turning left and right.


        1. Check for DTCs.


          1. Check for DTCs Click here.

            Note


            • If DTC C1516 (Torque Sensor Zero Point Adjustment Incomplete) is stored, the torque sensor zero point cannot be calibrated. Clear the DTCs before starting calibration.

            • If DTCs other than C1516 are output, refer to the Diagnostic Trouble Code Chart Click here.

        2. Perform pre-calibration check.


          1. Turn the power switch off.

          2. Disconnect the c1 power steering ECU assembly connector.

          3. Turn the power switch on (IG).

          4. A0003Z9E01
        9. Text in Illustration
        *a

        Front view of wire harness connector

        (to Power Steering ECU Assembly)

Measure the voltage according to the value(s) in the table below.

Note

If the IG power supply voltage is 8 V or less, calibration cannot be performed. In this case, charge or replace the auxiliary battery, and then perform calibration.

  • Turn the power switch off.

  • Reconnect the c1 power steering ECU assembly connector.

  • Clear sensor calibration value.


    1. Set the steering wheel to the center point and align the front tires straight ahead.

    2. Turn the power switch off.

    3. A0008FXE37
    • Text in Illustration
    *1 DLC3

    Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

    SST
    09843-18040

    Note

    Connect the terminals to the correct positions to avoid a malfunction.

  • Turn the power switch on (IG) and then connect and disconnect terminals 13 (TC) and 4 (CG) at least 20 times in 20 seconds.

  • A0008HME09
    Text in Illustration
    *1 EPS Warning Light

    Check that the EPS warning light blinks and then remains illuminated.

    Tech Tips

    The EPS warning light illumination indicates that DTC C1515 has been stored.

  • Turn the power switch off.

    Note

    After erasing the sensor calibration value, zero point calibration cannot be performed if the power switch is on (IG).

  • Perform torque sensor zero point calibration.

    Note

    As torque sensor zero point calibration cannot be performed if DTC C1515 has not been stored, be sure to perform sensor calibration value erasure before performing torque sensor zero point calibration.


    1. Set the steering wheel to the center point and align the front tires straight ahead.

    2. Turn the power switch off.

    3. A0008FXE37
      Text in Illustration
      *1 DLC3

      Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      SST
      09843-18040

    4. Turn the power switch on (IG) and then connect terminals 13 (TC) and 4 (CG).

      Note

      Do not touch the steering wheel during calibration (for 3 seconds).

      Tech Tips

      The EPS warning light remains illuminated even after calibration has completed.

  • ASSIST MAP WRITING (USING GTS)

    Note

    Perform assist map writing if any of the following condition occurs:

    The power steering ECU assembly has been replaced.


    1. Turn the power switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Chassis / EMPS / Utility / Signal Check.

      Tech Tips


      • Follow the instructions on the GTS to perform Signal Check.

      • With DTC C1581 output, performing Signal Check will cause the power steering ECU assembly to enter Signal Check and the assist map will be written automatically.

    6. Wait for at least 5 seconds.

    7. Check for DTCs Click here.

      Tech Tips

      After writing the assist map, if DTC C1581 is output, perform the troubleshooting procedure for DTC C1581 Click here.

  • ASSIST MAP WRITING (USING SST CHECK WIRE)

    Note

    Perform assist map writing if the following condition occurs:

    The power steering ECU assembly has been replaced.

    Tech Tips

    If DTC C1581 is output after torque sensor zero point calibration, perform assist map writing.


    1. A0008FXE38
      Text in Illustration
      *1 DLC3

      Turn the power switch off.

    2. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      SST
      09843-18040

      Note

      Connect the terminals correctly to avoid a malfunction.

    3. Turn the power switch on (IG).

    4. Wait for 5 seconds or more.

    5. Check for DTCs Click here.

      Tech Tips

      After writing the assist map, if DTC C1581 is output, perform the troubleshooting procedure for DTC C1581 Click here.