POWER STEERING SYSTEM CALIBRATION


  1. ROTATION ANGLE SENSOR VALUE INITIALIZATION AND TORQUE SENSOR ZERO POINT CALIBRATION (USING THE GTS)

    Note

    Clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point if any of the following has occurred:


    • The power steering ECU assembly has been replaced.

    • The steering column assembly has been replaced.

    • Steering effort differs between turning left and right.


    1. 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

        ECU power source voltage/

        Min.: 0.0000 V

        Max.: 20.1531 V

        		 9 to 16 V Power switch on (IG)

        Note

        If the IG power supply voltage is 9 V or less, calibration cannot be performed. In this case, charge or replace the auxiliary battery, and then perform calibration.

      7. Rotation angle sensor calibration value clear, rotation angle sensor value initialization, and torque sensor zero point calibration

        Note


        • If DTC C1516/16 (Torque Sensor Zero Point Adjustment Incomplete) is stored, the torque sensor zero point cannot be calibrated. Clear the DTCs before starting calibration.

        • If DTC C1526/18 (Rotation Angle Sensor Initialization Incomplete) is stored, the rotation angle sensor value cannot be initialized. Clear the DTCs before starting initialization.


        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


          • After rotation angle sensor value initialization and zero point calibration completes normally, confirm that no DTCs are output.

          • If DTC C1515/15, C1516/16, C1525/17, C1526/18, C1534/25 or C1581/26 is output, perform troubleshooting for the corresponding DTC.

        8. Result
        Result See Procedure
        DTC C1515/15 is output.

        Click here

        DTC C1516/16 is output.

        Click here

        DTC C1525/17 is output.

        Click here

        DTC C1526/18 is output.

        Click here

        DTC C1534/25 is output.

        Click here

        DTC C1581/26 is output.

        Click here

  • ROTATION ANGLE SENSOR INITIALIZATION AND TORQUE SENSOR ZERO POINT CALIBRATION (USING SST CHECK WIRE)

    Note

    Clear the rotation angle sensor calibration value, initialize the rotation angle sensor, and calibrate the torque sensor zero point if any of the following has occurred:


    • The power steering ECU assembly has been replaced.

    • The steering column assembly has been replaced.

    • Steering effort differs between turning left and right.


    1. Check for DTCs.


      1. Check for DTCs Click here.

        Note


        • If DTC C1516/16 (Torque Sensor Zero Point Adjustment Incomplete) is stored, the torque sensor zero point cannot be calibrated. Clear the DTCs before starting calibration.

        • If DTC C1526/18 (Rotation Angle Sensor Initialization Incomplete) is stored, the rotation angle sensor cannot be initialized. Clear the DTCs before starting initialization.

        • If DTCs other than C1516/16 and C1526/18 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 L54 power steering ECU assembly connector.

      3. Turn the power switch on (IG).

      4. B005YYVE02
        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 measured value is 9 V or less, the calibration cannot be performed. Recharge or replace the auxiliary battery and then perform calibration.

      5. Turn the power switch off.

      6. Connect the L54 power steering ECU assembly connector.

      7. Clear the 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. B005ZUUE54
        8. 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.

  • B005YOEE02
    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 DTCs C1515/15 and C1525/17 have been stored.

  • Turn the power switch off.

    Note

    After clearing the sensor calibration value, rotation angle sensor initialization or zero point calibration cannot be performed if the power switch is on (IG).

  • Torque sensor zero point calibration.

    Note

    As torque sensor zero point calibration cannot be performed if DTC C1515/15 has not been stored, be sure to clear the sensor calibration value 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. B005ZUUE54
      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 the calibration (for 3 seconds).

      Tech Tips

      The EPS warning light remains illuminated if calibration has completed.

    5. With terminals 12 (TS) and 4 (CG), and 13 (TC) and 4 (CG) connected, and the power switch on (IG), continue to perform rotation angle sensor initialization.

  • Rotation angle sensor initialization.

    Note

    As rotation angle sensor initialization cannot be performed if DTC C1525/17 has not been stored, be sure to clear the sensor calibration value and torque sensor zero point calibration before performing rotation angle sensor initialization.


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

      Note

      Make sure that terminals 12 (TS) and 4 (CG), and 13 (TC) and 4 (CG) are connected, and the power switch is on (IG).

    2. Disconnect and reconnect terminals 13 (TC) and 4 (CG).

      Tech Tips

      Disconnecting and reconnecting terminals 13 (TC) and 4 (CG) allows the power steering ECU assembly to change modes to rotation angle sensor initialization mode.

    3. Turn the steering wheel to the left and right 45° or more. Then turn the steering wheel to the left or right 90° or more.

      Note

      Do not turn the steering wheel sharply.

      Tech Tips


      • When the calibration has been completed normally, the EPS warning light goes from being illuminated to blinking (at 0.125 second intervals).

      • The EPS warning light remains illuminated if calibration has not completed normally. In this case, check for DTCs and perform calibration again if DTC C1515/15 and/or C1525/17 is/are output. When performing calibration again, perform it in the following order: clear sensor calibration value and perform torque sensor zero point calibration and rotation angle sensor initialization. If DTCs other than C1515/15 and C1525/17 are output, go to Diagnostic Trouble Code Chart Click here.

    4. Disconnect SST from the DLC3.

    5. Turn the power switch off.

  • ASSIST MAP WRITING (USING THE GTS)

    Note

    Perform assist map writing if any of the following conditions occur:

    The power steering ECU assembly has been replaced.

    Tech Tips

    If DTC C1581/26 is output after torque sensor zero point calibration, perform assist map writing.


    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 C1581/26 output, performing Signal Check will cause the power steering ECU assembly to enter Test Mode and the assist map will be written automatically.

    6. Wait for at least 1 second.

    7. Check for DTCs Click here.

      Tech Tips

      After writing the assist map, if DTC C1581/26 is output, perform the troubleshooting procedure for DTC C1581/26 Click here.

  • ASSIST MAP WRITING (USING SST CHECK WIRE)

    Note

    Perform assist map writing if any of the following conditions occur:

    The power steering ECU assembly has been replaced.

    Tech Tips

    If DTC C1581/26 is output after torque sensor zero point calibration, perform assist map writing.


    1. B005ZUUE52
      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 1 seconds or more.

    5. Check for DTCs Click here.

      Tech Tips

      After writing the assist map, if DTC C1581/26 is output, perform the troubleshooting procedure for DTC C1581/26 Click here.