Inspection Procedure

HINT:

• Check the condition of each related circuit connector before troubleshooting (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
• When C1774 is output, inspect and repair the trouble areas indicated by C1774 first (see DTC C1774 LOW BATTERY POSITIVE VOLTAGE  ).

1. CHECK FOR DTC 
   1. Clear the DTC (see FAIL-SAFE CHART  ).
   2. Turn the power switch OFF.
   3. Turn the power switch ON (IG) again and check that no CAN communication system DTC is output.
   4. Turn the power switch ON (READY).
   5. Drive the vehicle and turn the steering wheel to the right and left at a speed of 24 mph (35 km/h), and check which DTC is output (see DTC CHECK / CLEAR  and BC-56).

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      Only DTC C1777 is output	A
      CAN communication system DTC is output	B
      Steering angle sensor DTC is output (Brake control system trouble code C1231/31)	C

   B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (See DIAGNOSTIC TROUBLE CODE CHART )

   C: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (See DIAGNOSTIC TROUBLE CODE CHART )

   A: GO TO Next Step 

2. CHECK WIRE HARNESS (STEERING ANGLE SENSOR INPUT VOLTAGE) 
   1. Disconnect the K19 steering angle sensor connector.
   2. Turn the power switch ON (IG).
   3. Measure the voltage of the wire harness side connector.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      K19-1 (IG) - K19-2 (ESS)	Power switch ON (IG)	10 to 14 V

   4. Turn the power switch OFF.
   5. Measure the resistance of the wire harness side connector.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Specified Condition
      K19-2 (ESS) - Body ground	Below 1 Ω

      Fig 1: Disconnecting K19 Steering Angle Sensor Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT REFERENCE
      
      

      Result	Proceed to
      OK	A
      OK (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE )	B
      NG	C

   B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE  

   C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   A: REPLACE STEERING ANGLE SENSOR