C1512
POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: C1511-C1514, C1517: Torque Sensor Circuit Malfunction
C1517 - Torque Hold Abnormal
DESCRIPTION
The torque sensor converts the rotational torque input to the steering wheel into an electrical signal and sends it to the power steering ECU. Based on this signal, the ECU detects steering effort.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
If the power steering ECU and steering column assembly have been replaced, perform rotation angle sensor initialization and torque sensor zero point calibration Programming and Relearning.
PROCEDURE
1. CHECK CONNECTOR CONNECTION CONDITION (TORQUE SENSOR - ECU)
(a) Check the connection condition of the z17 torque sensor connector.
OK:
Torque sensor connector is securely connected to the power steering ECU.
Text in Illustration
NG -- CONNECT CONNECTOR SECURELY
OK -- Continue to next step.
2. READ VALUE USING TECHSTREAM (TORQUE SENSOR 1, TORQUE SENSOR 2)
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(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 (TRQV VOLTAGE)
OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal
3. CHECK POWER STEERING ECU (TRQV VOLTAGE)
(a) Turn the ignition switch to ON.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE POWER STEERING ECU ASSEMBLY Removal
OK -- Continue to next step.
4. CHECK POWER STEERING ECU (TRQ1, TRQ2 VOLTAGE)
(a) Turn the ignition switch to ON.
(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 ASSEMBLY Removal