Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - VARIABLE GEAR RATIO STEERING
VARIABLE GEAR RATIO STEERING SYSTEM - PRECAUTION
| 1.TROUBLESHOOTING PRECAUTIONS |
If the problem is caused by a poor connection of a terminal or poor installation of a part, reconnecting the terminal, or removing and reinstalling the part may solve the problem, or may temporarily return the system to normal.
To determine the cause of the problem, check for DTCs or confirm the vehicle operating conditions when the problem occurred and note them down before disconnecting connectors or removing parts.
Be sure to check for DTCs in other systems as the problem may be caused by a malfunction in another system.
DTCs may be stored in the vehicle stability control system due to Variable Gear Ratio Steering (VGRS) system inspections. Check for DTCs in the vehicle stability control system and clear any output codes after inspecting the VGRS system.
When the engine switch is turned on (IG)/off, the system start-up/stop operation is performed. At this time, a small operating sound can be heard and the steering wheel turns slightly.
If "Invalid" is displayed for "Straight Angle Valid Flag" in the Data List, the VGRS system does not operate.
If the steering wheel is turned left and right with the engine switch off, a noise can be heard. However, this is not a malfunction.
| 2.HANDLING AND OPERATING PRECAUTIONS |
Removal and installation of the steering control ECU, steering actuator, and each sensor must be performed with the engine switch off unless specified.
If the steering control ECU, steering actuator, or a sensor is removed and installed, perform the test mode inspection, check for DTCs, and confirm that the normal system code is output.
If the engine switch is turned on (IG) with the steering control ECU connector disconnected, DTCs may be stored in the vehicle stability control system. Check for DTCs in those systems and clear any output codes after completing repairs.
| 3.PRECAUTIONS FOR REPLACEMENT OF STEERING SYSTEM PARTS |
If the steering control ECU or steering actuator is replaced, perform actuator angle neutral point calibration and initialization.
The steering control ECU cannot be disassembled or repaired. If there is any problem with the steering control ECU, replace it with a new one.
| 4.PRECAUTIONS FOR STEERING WHEEL OFF-CENTER |
- NOTICE:
- If the steering wheel is still off-center after completing steering angle sensor initialization (), perform VGRS system calibration ().
- HINT:
| 5.CONDITIONS UNDER WHICH VGRS SYSTEM DOES NOT OPERATE |
The VGRS system does not operate under any of the following conditions:
The power supply voltage is low or too high.
A fail-safe function is operating to protect the system from overheating. System control is suspended to prevent the motor in the steering actuator and the steering control ECU from overheating. If the temperatures of the motor and ECU drop, the system will return to normal.
The vehicle is exposed to extremely low temperatures. If the ambient temperature becomes approximately -30°C (-22°F), system control will be suspended.
- NOTICE:
- If any of the above occur, perform steering angle sensor initialization ().