Inspection Procedure

HINT:

• When U0073/94, U0123/62, U0124/95 and/or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/95 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 DTC (See DTC CHECK/CLEAR  ).
   2. Turn the ignition switch to OFF.
   3. Turn the ignition switch to ON 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 and acceleration sensor DTCs are output (See DTC CHECK/CLEAR  ).

      Result 

      RESULT CHART
      
      

      Result	Proceed to
      DTC (C1231/31) output	A
      DTC output (relating to CAN communication system)	B
      DTC output (relating to speed sensor or yaw rate and acceleration sensor)	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 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 ignition switch to 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 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Switch Condition	Specified Condition
      F33-4 (IG1) - Body ground	Ignition switch ON	11 to 14 V
      F33-5 (BAT) - Body ground	Always	11 to 14 V

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

   Fig 1: Identifying Steering Angle Sensor Connector Terminals (Power Source Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Go to next step 

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      F33-1 (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  ).

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

   Fig 2: Identifying Steering Angle Sensor (Ground Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE STEERING ANGLE SENSOR  (See REMOVAL  )