Power Steering System: Calibration: Calibration

1. 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 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	9 to 16 V	Power switch on (IG)

      Standard Voltage

      9 to 16 V

      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.

2. Rotation angle sensor calibration value clear, rotation angle sensor value initialization, and 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.
   • If DTC C1526 (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 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.
      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. Refer to DTC CHECK / CLEAR .
      NOTE:

      • After rotation angle sensor value initialization and zero point calibration completes normally, confirm that no DTCs are output.
      • If DTC C1515, C1516, C1525, C1526, 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; DTC C1525: Rotation Angle Sensor Initialization Undone
        DTC C1516 is output.	Refer to DTC C1516: Torque Sensor Zero Point Adjustment Incomplete; DTC C1526: Rotation Angle Sensor Initialization Incomplete
        DTC C1525 is output.	Refer to DTC C1515: Torque Sensor Zero Point Adjustment Undone; DTC C1525: Rotation Angle Sensor Initialization Undone
        DTC C1526 is output.	Refer to DTC C1516: Torque Sensor Zero Point Adjustment Incomplete; DTC C1526: Rotation Angle Sensor Initialization Incomplete
        DTC C1534 is output.	Refer to DTC C1521: Motor Circuit Malfunction; DTC C1531: ECU Malfunction; DTC C1532: ECU Malfunction; DTC C1533: ECU Malfunction; DTC C1534: ECU Malfunction
        DTC C1581 is output.	Refer to DTC C1581: Assist Map Number Un-Writing

HINT: 

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

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.

   HINT: 

   • Follow the instructions on the Techstream to perform Signal Check.
   • 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. Wait for at least 1 second.
7. Check for DTCs. Refer to DTC CHECK / CLEAR .

   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 .