Variable Gear Ratio Steering System Diagnosis System

Inspect the battery voltage.

Standard:

11 to 14 V

HINT:

If the voltage is below 11 V, recharge the battery before proceeding.

Check the DLC3.

1. The steering control ECU uses CAN and ISO 9141-2 as its communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-3and matches the ISO 9141-2 format. Verify the conditions listed in the table below.
   
   

   Symbols (Terminals No.)	Terminal description	Condition	Specified condition
   SIL (7) - SG (5)	Bus "+" line	During transmission	Pulse generation
   CG (4) - Body ground	Chassis ground	Always	Below 1 Ω
   SG (5) - Body ground	Signal ground	Always	Below 1 Ω
   BAT (16) - Body ground	Battery positive	Always	11 to 14 V
   CANH (6) - CANL (14)	HIGH-level CAN bus line	Engine switch off	54 to 67 Ω
   CANH (6) - Battery positive	HIGH-level CAN bus line	Engine switch off	1 MΩ or higher
   CANH (6) - CG (4)	HIGH-level CAN bus line	Engine switch off	3 kΩ or higher
   CANL (14) - Battery positive	LOW-level CAN bus line	Engine switch off	1 MΩ or higher
   CANL (14) - CG (4)	LOW-level CAN bus line	Engine switch off	3 kΩ or higher

   HINT:

   If the display shows a communication error message when you connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and operate the intelligent tester, there is a problem on either the vehicle side or the tool side.

   1. If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
      
   2. If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.
      
   3. If the problem still occurs after the above inspection is performed, there may be a problem with the DLC3 connector.
      

If a malfunction occurs during system operation, the master warning light (VGRS) on the combination meter assembly will come on and "CHECK VGRS" will be displayed on the multi-information display to inform the driver of the system malfunction.

Normal mode.

1. DTCs are memorized in the steering control ECU and read by using the intelligent tester (Click here).
   

Test mode.

1. By switching from normal mode to test mode, the steering angle sensor can be inspected (Click here).
   

   HINT:

   Whether the system is in diagnostic mode or test mode can be checked from the indication on the multi-information display. For details of the indication and how to check, refer to "DTC CHECK/CLEAR" (Click here).

Turn the engine switch on (IG).

Check that the master warning light (VGRS) comes on for 2 seconds.

HINT:

If the master warning light (VGRS) check result is not normal, proceed to troubleshooting of the warning light circuit.