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.


        Chassis > EMPS > Data List
        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)

        Chassis > EMPS > Data List
        Tester Display
        IG Power Supply

        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.


          Chassis > EMPS > Utility
        8. Tester Display
        Torque Sensor Adjustment

Note


  • Check for DTCs.

    Click here


    Chassis > EMPS > Trouble Codes

    Note

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

  • 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 E30 power steering ECU assembly connector.

      3. Turn the power switch on (IG).

      4. A01KTJTC01
    • *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 E30 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. A01KR59C01
    • *a 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.

  • A01KS5YC04
    *a 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. A01KR59C02
      *a 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 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.


      Chassis > EMPS > Utility
      Tester Display
      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


      Chassis > EMPS > Trouble Codes

      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. A01KR59C03
      *a 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