Power Assist System (Brush)

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for Brush Type Motor): C1511-C1514,C1517: Torque Sensor Circuit Malfunction
C1517 - Torque Hold Abnormal

DESCRIPTION

The power steering ECU calculates assisting power based on steering torque signals from the torque sensor. If these DTCs are stored in the power steering ECU, the ECU stops steering power assist as a fail-safe function.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* If the power steering ECU has been replaced with a new one, perform the assist map writing and the torque sensor zero point calibration Power Steering System (For Brush Type Motor).
* If the steering column assembly has been replaced with a new one, perform the torque sensor zero point calibration after performing the initialization of the torque sensor zero point value Power Steering System (For Brush Type Motor).

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION (TORQUE SENSOR - ECU)

(a) Check the installation condition of the torque sensor connector.

OK:

Torque sensor connector is securely connected to the power steering ECU.

NG -- CONNECT CONNECTOR
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM (TORQUE SENSOR1, TORQUE SENSOR2)

(a) Turn the power switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Chassis / EMPS / Data List.

(f) Select the items "Torque sensor 1 output" and "Torque sensor 2 output" in the Data List and read the value displayed on the Techstream.

EMPS





OK:

Normal condition value is displayed on the Techstream during each steering operation.

NG -- CHECK POWER STEERING ECU (TOQUE SENSOR OUTPUT)

OK -- REPLACE POWER STEERING ECU Removal

3. CHECK POWER STEERING ECU (TOQUE SENSOR OUTPUT)

(a) Turn the power switch on (READY).





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPLACE POWER STEERING ECU Removal
OK -- Continue to next step.

4. CHECK STEERING COLUMN ASSEMBLY (TORQUE SENSOR)

(a) Turn the power switch on (READY).





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





NG -- REPLACE STEERING COLUMN ASSEMBLY Removal

OK -- REPLACE POWER STEERING ECU Removal