Inspection Procedure

HINT:

• When U0073/94, U0123/62, U0124/95 or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/95 or U0126/63 first.
• When the speed sensor or the yaw rate sensor has trouble, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate sensor are output together with other DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate sensor first, and then inspect and repair the steering angle sensor.

1. CHECK DTC 
   1. Clear the DTC (See DTC CHECK / CLEAR  ).
   2. Turn the engine switch off.
   3. Turn the engine switch on (IG) again and check that no CAN communication system DTC is output.
   4. Drive the vehicle and turn the steering wheel to the right and left at the speed of 35 km/h (22 mph) and check that no speed sensor and yaw rate sensor DTCs are output.

      Result 

      RESULT CHART
      
      

      Condition	Proceed to
      No CAN communication system DTC and the speed sensor or yaw rate sensor DTC are output	A
      CAN communication system DTC is output	B
      Speed sensor or yaw rate sensor DTC is output	C

      HINT:

      • If there is a malfunction in the speed sensor or the yaw rate sensor, an abnormal value may be output although the steering angle sensor is normal.
      • If the speed sensor and the yaw rate sensor DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor.

   B: INSPECT CAN COMMUNICATION SYSTEM 

   C: REPAIR CIRCUIT INDICATED BY OUTPUT DTC (See  DIAGNOSTIC TROUBLE CODE CHART   ) 

   A: Go to Next Step 

2. INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL) 
   1. Turn the engine switch off.
   2. Remove the steering wheel and the column cover lower.
   3. Disconnect the steering angle sensor connector.
   4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      E31-1 (IG) - Body ground	Engine switch on (IG)	10 to 14 V
      E31-3 (BAT) - Body ground	Always	10 to 14 V

   Fig 1: Identifying Steering Angle Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

   OK: Go to Next Step 

3. INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL) 
   1. Turn the engine switch off.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      E31-2 (ESS) -Body ground	Always	Below 1 Ω.

      HINT:

      If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See PROBLEM SYMPTOMS TABLE  ).

   Fig 2: Identifying Steering Angle Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

   OK: REPLACE STEERING ANGLE SENSOR