Inspection Procedure

HINT:

• When U0073, U0123, U0124 and/or U0126 is output together with C1434, inspect and repair the trouble areas indicated by U0073, U0123, U0124 and/or U0126 first (See DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF; DTC U0100 LOST COMMUNICATION WITH ECM / PCM; DTC U0123 LOST COMMUNICATION WITH YAW RATE SENSOR MODULE; DTC U0124 LOST COMMUNICATION WITH LATERAL ACCELERATION SENSOR MODULE; DTC U0126 LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE ).
• When any of the speed sensors or the yaw rate and deceleration 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 sensors or yaw rate and deceleration sensor are output together with DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate and deceleration 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 DIAGNOSTIC TROUBLE CODE CHART ).
   4. Start the engine.
   5. Drive the vehicle at a speed of 35 km/h (22 mph) and turn the steering wheel to the right and left and check that no speed sensor or yaw rate and deceleration sensor DTCs are output (See DTC CHECK / CLEAR ).

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   No CAN communication system, speed sensor, or yaw rate and deceleration sensor DTCs are output.	A
   CAN communication system DTC is output.	B
   Speed sensor or yaw rate and deceleration sensor DTC is output.	C

   HINT:

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

   B : INSPECT CAN COMMUNICATION SYSTEM  (See DIAGNOSTIC TROUBLE CODE CHART )

   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 off.
   2. Remove the steering wheel and the column cover lower.
   3. Make sure that there is no looseness in the locking part and 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 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   E11-4 (IG) - Body ground	Ignition switch ON	11 to 14 V
   E11-5 (BAT) - Body ground	Always	11 to 14 V

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

   Fig 1: Identifying E11 Steering Angle Sensor Connector Terminals (IG And BAT)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   E11-1 (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 E11 Steering Angle Sensor Connector Terminals (ESS)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE STEERING ANGLE SENSOR  (See REMOVAL )