Inspection Procedure

HINT:

• When U0073/94, U0123/62 and/or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62 and/or U0126/63 first (See DTC U0073/94 CONTROL MODULE COMMUNICATION BUS OFF; DTC U0100/65 LOST COMMUNICATION WITH ECM / PCM; DTC U0123/62 LOST COMMUNICATION WITH YAW RATE SENSOR MODULE; DTC U0124/95 LOST COMMUNICATION WITH LATERAL ACCELERATION SENSOR MODULE; DTC U0126/63 LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE  ).
• When the speed sensor or the yaw rate and acceleration 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 and acceleration sensor are output together with other DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate and acceleration sensor first, and then inspect and repair the steering angle sensor.

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

      Result 

      RESULT CHART
      
      

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

      HINT:

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

        B: INSPECT CAN COMMUNICATION SYSTEM  (See HOW TO PROCEED WITH TROUBLESHOOTING )

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

        A: Go to next step 

2. INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL) 
   1. Turn the ignition switch off.
   2. Remove the steering wheel and the column cover.
   3. Make sure that there is no looseness at the locking part and the connecting part of the connector.
   4. Disconnect the steering angle sensor connector.
   5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      VOLTAGE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      D35-5 (IG) - Body ground	Ignition switch ON	11 to 14 V
      D35-6 (BAT) - Body ground	Always	11 to 14 V

      Text in Illustration 

      ILLUSTRATION LEGEND
      
      

      *1	Front view of wire harness connector (to Spiral Cable Sub-assembly (Steering Angle Sensor))

      Fig 1: Identifying Steering Angle Sensor Connector Terminals

      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 ignition switch off.
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION
      
      

      Tester Connection	Condition	Specified Condition
      D35-2 (ESS) - Body ground	Always	Below 1 Ω

      Text in Illustration 

      ILLUSTRATION LEGEND
      
      

      *1	Front view of wire harness connector (to Spiral Cable Sub-assembly (Steering Angle Sensor))

      Fig 2: Identifying Steering Angle Sensor Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

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

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

      OK: REPLACE SPIRAL CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR)  (See REMOVAL  )