Variable Gear Ratio Steering System Vgrs System Stops Or Does Not Operate

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (RECORD OF OVERHEAT)

CHECK HEAT PROTECTION FUNCTION FOR STEERING ACTUATOR

CHECK STEERING EFFORT

CHECK STEERING ACTUATOR

CHECK STEERING CONTROL ECU (POWER SOURCE CIRCUIT)

INSPECTION PROCEDURE

HINT:

This problem may be caused by a malfunction in the vehicle stability control system or steering system.

Make sure that no DTC is output for the skid control ECU or steering control ECU before proceeding with the following procedures.

If a DTC is output for either of these ECUs, first troubleshoot it and then proceed to the troubleshooting below.

1. Use the Data List to check if the record of overheat is functioning properly.
   
   

   VGRS

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Motor Overheat Record	Record of continuous overheat preventive control/Rec or Unrec	Rec or Unrec	-

   Result

   Result	Proceed to
   "Rec" (Record of motor overheating)	A
   "Unrec" (No record of motor overheating)	B

   HINT:

   If "Rec" is displayed, reset the setting to "Unrec". Enter the VGRS menu on the tester, select record clearance, and follow the prompts to set to "Unrec".

1. Turn the engine switch on (IG) and wait for 30 minutes until the steering actuator cools down.
   

2. Start the engine and slowly turn the steering wheel from lock to lock (approximately 90°/sec.) 3 times.
   

   HINT:

   If turning the steering wheel quickly while driving at low speeds, the steering angle may differ between the left and right, or the steering wheel may become off-center.

   However, this is not a malfunction.

3. Check the number of turns from lock to lock.
   

   Result

   Result	Proceed to
   3.2 turns	A
   2.7 turns	B

1. Start the engine.
   

2. Turn the steering wheel.
   

3. Measure the steering effort.
   

   Standard steering effort:

   Below 6.9 N*m (70 kgf*cm, 61 in.*lbf)
   

   HINT:

   After completing the inspection or repair, attempt to simulate the problem and then perform "Read Value Using Intelligent Tester" above again to reconfirm that the problem does not occur.

   Result

   Result Result	Proceed to
   OK	A
   NG (for 1VD-FTV with DPF)	B
   NG (except 1VD-FTV with DPF)	C

1. Check for abnormal noise or vibration in the steering actuator.
   

   OK:

   Neither abnormal noise nor vibration occurs.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   E77-3 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   E77-8 (PIG) - Body ground

2. Turn the engine switch off.
   

3. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E77-7 (PGND) - Body ground	Always	Below 1 Ω

   Result

   Result Result	Proceed to
   NG	A
   OK (for LHD)	B
   OK (for RHD)	C