Programming and Relearning

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: CALIBRATION

1. ROTATION ANGLE SENSOR VALUE INITIALIZATION AND TORQUE SENSOR ZERO POINT CALIBRATION

NOTICE:
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 steering column assembly has been replaced.
* Steering effort differs between turning left and right.

(a) 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





Standard Voltage:

9 to 16 V

NOTICE:
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.

(b) Rotation angle sensor calibration value clear, rotation angle sensor value initialization, and 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 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.

NOTICE:
* 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 Reading and Clearing Diagnostic Trouble Codes.

NOTICE:
* 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:





2. ASSIST MAP WRITING

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

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the power switch on (IG).

(d) Turn the Techstream on.

(e) 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.

(f) Wait for at least 1 second.

(g) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

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