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Home >> Lexus >> 2019 >> ES 350 Luxury >> Repair and Diagnosis >> External Pages >> Different car >> Section 154 (Power Steering System (Hybrid) - Diagnostics - Introduction) >> POWER STEERING SYSTEM (for HV Model) >> Calibration [06/2018 - ] >> Calibration [06/2018 - ]

Calibration [06/2018 - ]

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  1. TORQUE SENSOR ZERO POINT CALIBRATION (USING TECHSTREAM) 
    NOTE:

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

    • The rack and pinion power steering gear 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 Techstream to the DLC3.
      3. Turn the power switch on (IG).
      4. Turn the Techstream on.
      5. Calibrate the rack and pinion power steering gear assembly. Enter the following menus: Chassis / EMPS / Data List.
      6. Read the Data List according to the display on the Techstream.

        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

        Standard Voltage

        8 to 16 V

        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.

    2. 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. Align the front wheels straight ahead and center the steering wheel.
      2. Turn the power switch off.
      3. Connect the Techstream to the DLC3.
      4. Turn the power switch on (IG).
      5. Turn the Techstream on.
      6. Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.

        Chassis > EMPS > Utility 

        Tester Display
        Torque Sensor Adjustment
        NOTE:
        • Do not turn the steering wheel sharply.
        • During the torque sensor zero point calibration the steering wheel will shudder. Do not touch the steering wheel until at least 3 seconds have elapsed after the shuddering has stopped.
      7. Check for DTCs.

        Chassis > EMPS > Trouble Codes 

        NOTE:

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

        Result

        Result See Procedure
        DTC C1515 is output. Refer to DTC C1515: Torque Sensor Zero Point Adjustment Undone [06/2018 - ]
        DTC C1516 is output. Refer to DTC C1516: Torque Sensor Zero Point Adjustment Incomplete [06/2018 - ]
        DTC C1534 is output. Refer to DTC C1511: Torque Sensor1; DTC C1512: Torque Sensor2; DTC C1513: Torque Sensor Deviation Excessive; DTC C1514: Torque Sensor Power Supply Voltage; DTC C1521: Short in Motor Circuit; DTC C1522: Power Supply Sensor; DTC C1523: Current Deviation Excessive; DTC C1528: Motor Rotation Angle Sensor; DTC C1531: ECU Malfunction; DTC C1532: ECU Malfunction; DTC C1533: Temperature Sensor Circuit is Low or High; DTC C1534: EEPROM; DTC C1555: Motor Relay Welding Failure [06/2018 - ]
        DTC C1581 is output. Refer to DTC C1581: Assist Map Number Un-Writing [06/2018 - ]
  2. ASSIST MAP WRITING (USING TECHSTREAM) 
    NOTE:

    Perform assist map writing if the following condition occurs:

    The rack and pinion power steering gear assembly has been replaced.

    1. Turn the power switch off.
    2. Connect the Techstream to the DLC3.
    3. Turn the power switch on (IG).
    4. Turn the Techstream on.
    5. Enter the following menus: Chassis / EMPS / Utility / Signal Check.

      Chassis > EMPS > Utility 

      Tester Display
      Signal Check

      HINT: 

      • Follow the instructions on the Techstream to perform Signal Check.
      • With DTC C1581 output, performing Signal Check will cause the rack and pinion power steering gear assembly to enter Signal Check and the assist map will be written automatically.
    6. Wait for at least 5 seconds.
    7. Check for DTCs.

      Chassis > EMPS > Trouble Codes 

      HINT: 

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

      Refer to DTC C1581: Assist Map Number Un-Writing [06/2018 - ]

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