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Diagnosis System

  1. FUNCTION OF WARNING LIGHT AND MESSAGE 
    1. If a malfunction occurs during system operation, the master warning light on the combination meter come on and "CHECK VGRS" will be displayed on the multi-information display to inform the driver of the system malfunction.
      Fig 1: CHECK VGRS Display
      G04950179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. DTC 
    1. Normal mode.
      1. DTCs are memorized in the steering control ECU and read by using the tester (see DTC CHECK / CLEAR  ).
    2. Test mode.
      1. By switching from normal mode to test mode, the steering angle sensor can be inspected (see TEST MODE PROCEDURE  ).

        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 " .

  3. CHECK MASTER WARNING LIGHT 
    1. Turn the engine switch on (IG).
    2. Check that the master warning light 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.

      Fig 2: Identifying Master Warning Light
      G04950170Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TROUBLE AREA REFERENCE

      Trouble Area See procedure
      Master warning light circuit MASTER WARNING LIGHT MALFUNCTION