BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1434; Steering Angle Sensor Output Malfunction; 2016 - 2017 MY Sienna [12/2015

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM100000000VIW1
Model Year Start: 2016	Model: Sienna	Prod Date Range: [12/2015 - 11/2017]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1434; Steering Angle Sensor Output Malfunction; 2016 - 2017 MY Sienna [12/2015 - 11/2017]

DTC

C1434

Steering Angle Sensor Output Malfunction

DESCRIPTION

Steering angle sensor signals are sent to the skid control ECU via the CAN communication system. When there is a malfunction in the CAN communication system, it will be detected by the steering angle sensor zero point malfunction diagnostic function.

DTC Code	DTC Detection Condition	Trouble Area
C1434	Error in communication between the skid control ECU and the steering angle sensor, or abnormal steering angle sensor zero point.	Steering angle sensor power supply Spiral cable (Steering angle sensor)

WIRING DIAGRAM

Refer to DTC C1432 (See page ).

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

When DTC U0073, U0123, U0124 and/or U0126 is output together with DTC C1434, inspect and repair the trouble areas indicated by DTC U0073, U0123, U01245 and/or U0126 first (See page ).
When any of the speed sensors 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 sensors or yaw rate and acceleration sensor are output together with 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.

PROCEDURE

CHECK DTC

(a) Clear the DTCs (See page ).

(b) Turn the ignition switch off.

(d) Start the engine.

(e) 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 or yaw rate and acceleration sensor DTCs are output (See page ).

Result

Result	Proceed to
No CAN communication system, speed sensor, or yaw rate and acceleration sensor DTCs 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 any of the speed sensors or the yaw rate and acceleration sensor, an abnormal value may be output although the steering angle sensor is normal.
If speed sensor and yaw rate and acceleration sensor DTCs are output simultaneously, repair these two sensors first and inspect the steering angle sensor.

INSPECT CAN COMMUNICATION SYSTEM

(See page )

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

2.	INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)

(a) Turn the ignition switch off.

(b) Remove the steering wheel and the column cover lower.

(d) Disconnect the steering angle sensor connector.

(e) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
D22-5 (IG) - Body ground	Ignition switch ON	11 to 14 V
D22-6 (BAT) - Body ground	Always	11 to 14 V

Text in Illustration

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

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

3.	INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL)

(a) Turn the ignition switch off.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D22-2 (ESS) - Body ground	Always	Below 1 Ω

HINT:

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

Text in Illustration

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

REPLACE SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (STEERING ANGLE SENSOR)

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)