DTC C1434: Steering Angle Sensor Output Malfunction: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [06/2012 - ] .
2. Turn the engine switch off.
3. Turn the engine switch on (IG) again and check that no CAN communication system DTCs are output. Refer to DIAGNOSIS SYSTEM [06/2012 - ] .
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 then check that no speed sensor or yaw rate and acceleration sensor DTCs are output. Refer to DTC CHECK / CLEAR [06/2012 - ] .

   Result

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

   HINT: 

   • If there is a malfunction in a speed sensor, or the yaw rate and acceleration sensor (airbag sensor assembly), DTCs for the steering angle sensor may be stored even though the steering angle sensor is normal.
   • If speed sensor and yaw rate and acceleration sensor DTCs are output simultaneously, repair the sensors and then inspect the steering angle sensor.

B → See step   7 

C → See step   5 

A: Go to next step 

1. Turn the engine switch off.
2. Check that the steering angle sensor has been installed properly. Refer to INSTALLATION [06/2012 - ] .

   OK

   The steering angle sensor installation is normal.

NG → See step   8 

OK: Go to next step 

1. Remove the steering wheel and the column cover.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the H23 steering angle sensor connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   H23-5 (BAT) - Body ground	Always	11 to 14 V
   H23-4 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Steering Angle Sensor)

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

OK: Go to next step 

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance according to the value(s) in the table below.
   NOTE:

   Before measuring the resistance of the steering angle sensor, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H23-1 (ESS) - Body ground	1 minute after engine switch off	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Steering Angle Sensor)

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [06/2012 - ] .

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

OK → See step   6