Variable Gear Ratio Steering System Precaution

Steering. Land Cruiser. Urj200, 202 Grj200 Vdj200
Variable Gear Ratio Steering. Land Cruiser. Urj200, 202 Grj200 Vdj200

  1. TROUBLESHOOTING PRECAUTIONS

  1. HANDLING AND OPERATING PRECAUTIONS

  1. PRECAUTIONS FOR REPLACEMENT OF STEERING SYSTEM PARTS

  1. PRECAUTIONS FOR STEERING WHEEL OFF-CENTER

  1. CONDITIONS UNDER WHICH VGRS SYSTEM DOES NOT OPERATE

Variable Gear Ratio Steering System -- Precaution



1.TROUBLESHOOTING PRECAUTIONS

  1. If a 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.

  2. To determine the cause of a problem, check for DTCs or confirm the vehicle operating conditions when the problem occurred and note them down before disconnecting connectors or removing parts.

  3. Be sure to check for DTCs in other systems as a problem may be caused by a malfunction in another system.

  4. Other systems may store DTCs when the VGRS system is inspected. Therefore, check and clear any DTCs from other systems after inspecting the VGRS system.

  5. 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.

  6. If "Fixed Val" is not displayed for "Direct Advance Wheel Angle Status" in the Data List, the VGRS system does not operate.

  7. 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

  1. Removal and installation of the VGRS ECU (steering control ECU), steering actuator assembly and each sensor must be performed with the engine switch off unless specified.

  2. If the VGRS ECU (steering control ECU), steering actuator assembly or a sensor is removed and installed, perform the test mode inspection, check for DTCs, and confirm that the normal system code is output.

  3. Other systems may store DTCs when the engine switch is turned on (IG) with the connector of the VGRS ECU (steering control ECU) disconnected. Therefore, after performing repairs, check and clear DTCs for other systems.


3.PRECAUTIONS FOR REPLACEMENT OF STEERING SYSTEM PARTS

  1. If the VGRS ECU (steering control ECU) or steering actuator assembly is replaced, perform actuator angle neutral point calibration and initialization.

  2. The VGRS ECU (steering control ECU) cannot be disassembled or repaired. If there is any problem with the VGRS ECU (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 sensor initialization (Click here), perform VGRS system calibration (Click here).
HINT:
  1. The steering wheel may become off-center under any of the following conditions. These conditions do not indicate a malfunction.
    1. The steering wheel is turned when the engine switch is off.
    2. The steering wheel is turned quickly.
    3. The steering wheel is turned from lock to lock.
  2. If the steering wheel is off-center, drive the vehicle at 40 km/h (25 mph) or more for 5 seconds, or turn the steering wheel to the left and right with the vehicle stopped or while driving at low speeds. This may center the steering wheel.
  3. If one of the situations under Conditions Under Which VGRS System does Not Operate occurs, the steering wheel may temporarily become off-centered.

5.CONDITIONS UNDER WHICH VGRS SYSTEM DOES NOT OPERATE

  1. The VGRS system does not operate under any of the following conditions:

    1. The power supply voltage is low or too high.

    2. A fail-safe function is operating to protect the system from overheating. System control is suspended to prevent the motor in the steering actuator assembly and the VGRS ECU (steering control ECU) from overheating. If the temperatures of the motor and ECU drop, the system returns to normal.

    3. Steering sensor zero point calibration has not been performed.