Toyota 4Runner: Steering Angle Sensor Output Malfunction (C1434)

Toyota 4Runner Service Manual / Brake / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Hydraulic Brake Booster) / Steering Angle Sensor Output Malfunction (C1434)

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 is detected by the steering angle sensor zero point malfunction diagnostic function.

DTC Code	DTC Detection Condition	Trouble Area
C1434	An error in communication between the skid control ECU and the steering angle sensor, or an abnormal steering angle sensor zero point.	ECU-B fuse ECU-IG NO. 1 fuse Steering angle sensor power supply Steering angle sensor (Spiral cable sub-assembly)

WIRING DIAGRAM

Refer to DTC C1432 (See page ).

CAUTION / NOTICE / HINT

NOTICE:

Do not remove the steering angle sensor from the spiral cable.
When replacing the spiral cable, confirm that the replacement part is of the correct specification.
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, U0124 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 stored 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 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 (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 then inspect the steering angle sensor.

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

2.	CHECK TERMINAL VOLTAGE (IG, BAT)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

3.	CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)

REPLACE SPIRAL CABLE SUB-ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

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