Toyota Corolla Cross: System Description
SYSTEM DESCRIPTION
DESCRIPTION
The power steering system generates torque through the operation of the motor and the reduction gear installed on the column shaft in order to assist steering effort.
The power steering ECU assembly determines the direction and the amount of assist power in accordance with the vehicle speed signals and signals from the torque sensor built into the electric power steering column sub-assembly. As a result, the power steering ECU assembly adjusts the steering effort so that it is lighter during low speed driving and heavier during high speed driving.
(a) Power steering ECU:
The power steering ECU calculates assist power based on steering torque signals from the torque sensor and vehicle speed signals from the or brake actuator assembly (skid control ECU).
(b) Torque sensor:
The torque sensor detects the steering effort generated when the steering wheel is turned and converts it to an electrical signal.
(c) Power steering motor:
The power steering motor generates torque in accordance with the current from the power steering ECU to assist the steering effort.
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How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the power steering system.
*: Use the GTS.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
Calibration
CALIBRATION
POWER STEERING ECU INITIAL SETTING (ASSIST MAP WRITING) (USING GTS)
NOTICE:
If any of the following conditions are met, perform Power Steering ECU Initial
Setting (assist map writing)
Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms. If
multiple suspected areas are listed, the potential causes of the symptoms are
listed in
SEE MORE:
Pressure Control Solenoid "J" Performance/Stuck Off (2 Trip Detected) (P281F00,P281F71)
DESCRIPTION
Using the current from the TCM, the shift solenoid valve SLP controls the primary
pulley pressure in accordance with the requested gear ratio to perform gear ratio
changes.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
Inspection
INSPECTION
PROCEDURE
1. INSPECT BRAKE CYLINDER AND PISTON
(a) Check the rear disc brake cylinder bore and rear disc brake piston
for rust and scoring. If necessary, replace the rear disc brake cylinder and rear
disc brake piston.
2. INSPECT PAD LINING THICKNESS
(a) Using a ruler,
