Electronic 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 assembly 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) to the DLC3.
Turn the engine switch on (IG).
Turn the intelligent tester on.
Select "IG SUPPLY " from the data list.
Check the IG power supply voltage on the tester screen.

Fig 1: Connecting Intelligent Tester To DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ITEM REFERENCE VALUE TABLE

Item	Measurement Item/Range (Display)	Inspection Condition	Reference Value
IG SUPPLY	ECU power source voltage/ Min.: 0 V, Max.: 25.5 V	Engine switch on (IG)	10 to 14 V

Voltage:

10 to 14 V

NOTE: If the IG power supply voltage is 10 V or less, calibration cannot be performed. In this case, charge or replace the battery, and then perform calibration.

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

Fig 2: Connecting Intelligent Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 (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) to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the intelligent tester on.
4. Select "TRQ SENSOR ADJ ".
5. 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.