Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Calibration

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Suspension / Power Assist Systems / Power Steering System / Calibration

CALIBRATION

TORQUE SENSOR ZERO POINT CALIBRATION (USING TECHSTREAM)

NOTICE:

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

  • The power steering ECU assembly has been replaced.
  • The electric power steering column sub-assembly has been replaced.
  • There is a difference in steering effort between turning left and right.

(a) Perform inspection before calibration.

(1) Turn the engine switch off.

(2) Connect the Techstream to the DLC3.

(3) Turn the engine 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.

Chassis > EMPS > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

IG Power Supply

IG power source voltage

Min.: 0.0000 V

Max.: 20.1531 V

8 to 16 V

Engine switch on (IG)
Chassis > EMPS > Data List

Tester Display

IG Power Supply

Standard Voltage:

8 to 16 V

NOTICE:

If the IG power supply voltage is 8 V or less, calibration cannot be performed. In this case, charge or replace the battery, and then perform calibration.

(b) Perform 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.

(1) Align the front wheels straight ahead and center the steering wheel.

(2) Turn the engine switch off.

(3) Connect the Techstream to the DLC3.

(4) Turn the engine switch on (IG).

(5) Turn the Techstream on.

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

Chassis > EMPS > Utility

Tester Display

Torque Sensor Adjustment

NOTICE:

  • Do not turn the steering wheel sharply.
  • During the torque sensor zero point calibration the steering wheel will shudder. Do not touch the steering wheel until at least 3 seconds have elapsed after the shuddering has stopped.

(7) Check for DTCs.

Click here

Chassis > EMPS > Trouble Codes

NOTICE:

If DTC C1515, C1516, C1534 or C1581 is output, perform troubleshooting for the corresponding DTC.

Result

See Procedure

DTC C1515 is output.

DTC C1516 is output.

DTC C1534 is output.

DTC C1581 is output.

ASSIST MAP WRITING (USING TECHSTREAM)

NOTICE:

Perform assist map writing if the following condition occurs:

The power steering ECU assembly has been replaced.

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Utility / Signal Check.

Chassis > EMPS > Utility

Tester Display

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 Signal Check and the assist map will be written automatically.

(f) Wait for at least 5 seconds.

(g) Check for DTCs.

Click here

Chassis > EMPS > Trouble Codes

HINT:

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

Click here

    Assist Map Number Mismatch (C1582)
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