Programming and Relearning

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for 2ZR-FE): CALIBRATION

1. TORQUE SENSOR ZERO POINT CALIBRATION (USING TECHSTREAM)

NOTICE:
Perform the torque sensor zero point calibration if any of the following conditions occur:

* The steering column assembly (containing the torque sensor) has been replaced.
* The power steering ECU has been replaced.
* 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.

(a) 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. Enter the following menus: Chassis / EMPS / Utility / Torque Sensor Adjustment.

NOTICE:
* Do not touch the steering wheel during the torque sensor zero point calibration.
* Perform the calibration only when the vehicle is stopped.
(7) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

NOTICE:
* After zero point calibration is completed normally, confirm that DTC is not output.
* If DTC C1515, C1516, C1534 or C1581 is output, perform troubleshooting for the corresponding DTC.

Result:





2. ASSIST MAP WRITING (USING TECHSTREAM)

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

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Start the engine.

(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 to enter Test Mode and the assist map will be written automatically.
(f) 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