Power Steering System (For Hatchback) Calibration

Steering. Yaris. Ncp93, 131
Power Assist Systems. Yaris. Ncp93, 131

  1. TORQUE SENSOR ZERO POINT CALIBRATION

  1. ASSIST MAP WRITING

Power Steering System (For Hatchback) -- Calibration



TORQUE SENSOR ZERO POINT CALIBRATION
NOTICE:
Perform the torque sensor zero point calibration if any of the following conditions occur:
  1. The steering column assembly (containing the torque sensor) has been replaced.
  2. The power steering motor assembly has been replaced.
  3. The power steering ECU assembly has been replaced.
  4. There is a difference in steering effort between turning right and left.
HINT:
When torque sensor zero point calibration is performed, the assist map is written automatically at the same time.

  1. Inspection before calibration.

    1. Turn the ignition switch off.

    2. Connect the Techstream to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the Techstream 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 V
      Max.: 20.1531 V
      		11 to 14 V
      		Ignition switch ON

      Standard voltage:
      11 to 14 V
      NOTICE:
      If the IG power supply voltage is 9 V or less, calibration cannot be performed. In this case, charge or replace the battery, and then perform calibration.

  2. Perform the torque sensor zero point calibration.

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

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

    2. Turn the ignition switch off.

    3. Connect the Techstream to the DLC3.

    4. Start the engine.

    5. Turn the Techstream on.

    6. Calibrate the power steering ECU assembly. Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.

      NOTICE:
      1. Do not touch the steering wheel during the torque sensor zero point calibration.
      2. Perform the calibration only when the vehicle is stopped.

    7. Check for DTCs (YARIS_NCP93 RM000001AL601KX.html).

      NOTICE:
      1. After zero point calibration is completed normally, confirm that DTC is not output.
      2. If DTC C1515, C1516, C1534 or C1581 is output, perform troubleshooting for the corresponding DTC.
      Result
      Result
      		Proceed to
      DTC C1515 is output.
      		YARIS_NCP93 RM000001WCS027X.html
      DTC C1516 is output.
      		YARIS_NCP93 RM000001WCT026X.html
      DTC C1534 is output.
      		YARIS_NCP93 RM000001CHX02GX.html
      DTC C1581 is output.
      		YARIS_NCP93 RM000003PCN00DX.html

ASSIST MAP WRITING
HINT:
If DTC C1581 is output after torque sensor zero point calibration, perform assist map writing.

  1. Turn the ignition switch off.

  2. Connect the Techstream to the DLC3.

  3. Start the engine.

  4. Turn the Techstream on.

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

    HINT:
    1. Follow the instructions on the Techstream to perform Signal Check.
    2. With DTC C1581 output, performing Signal Check will cause the power steering ECU assembly to enter Test Mode and the assist map will be written automatically.

  6. Check for DTCs (YARIS_NCP93 RM000001AL601KX.html).

    HINT:
    After writing the assist map, if DTC C1581 is output, perform the troubleshooting procedure for DTC C1581 (YARIS_NCP93 RM000003PCN00DX.html).