Power Steering System: Calibration

ROTATION ANGLE SENSOR VALUE INITIALIZATION AND TORQUE SENSOR ZERO POINT CALIBRATION

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 has been replaced.
The power steering gear assembly has been replaced.
Steering effort differs between left and right.

Inspection before calibration.

Connect the intelligent tester (with CAN VIM) or Techstream to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester or Techstream on. Intelligent tester - Select "IG SUPPLY" from the data list.
Techstream - Select "IG Supply" from the data list.

Check the IG power supply voltage on the tester screen.

Intelligent tester

EMPS

INTELLIGENT TESTER - EMPS

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
IG SUPPLY	ECU power source voltage/ Min.: 0 V, Max.: 25.5 V	Engine switch on (IG): 11 to 14 V	When malfunction occurs, problem may be ECU power supply

Techstream

EMPS

TECHSTREAM - EMPS

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
IG Supply	ECU power source voltage/ Min.: 0 V, Max.: 25.5 V	Engine switch on (IG): 11 to 14 V	When malfunction occurs, problem may be ECU power supply

Standard voltage:

11 to 14 V

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

Clearing rotation angle sensor calibration value, 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 DTC before starting calibration.
- If DTC C1526 (Motor Rotation Angle Sensor Initialization Incomplete) is stored, the rotation angle sensor value cannot be initialized. Clear the DTC before starting initialization.
1. Connect the intelligent tester (with CAN VIM) or Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the intelligent tester or Techstream on. Intelligent tester - Select "TRQ SENSOR ADJ". Techstream - Select "Torque Sensor Adjustment".
4. Follow the procedures on the tester display to clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point.
  NOTE:
  - When initializing the rotation angle sensor value, observe the following to stabilize sensor voltage:
    After turning the engine switch on (IG), wait for at least 2.5 seconds before turning the steering wheel. Do not turn the steering wheel quickly.
  - The steering wheel will vibrate during torque sensor zero point calibration. Do not touch the steering wheel while it is vibrating or for 2 seconds after it stops.