Toyota Tacoma 2015-2018 Service Manual: Steering Angle Sensor Output Malfunction (C1434)

Toyota Tacoma 2015-2018 Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System(for Vacuum Brake Booster) / Steering Angle Sensor Output Malfunction (C1434)

DESCRIPTION

Steering angle sensor signals are input to the skid control ECU (brake actuator assembly) via the CAN communication system.

HINT:

When a malfunction occurs in the communication line to the steering angle sensor, U0126 is output. If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.

DTCs may be stored if one of the following occurs:

Steering angle sensor zero point malfunction
Steering angle sensor signal malfunction

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
C1434	Steering Angle Sensor Output Malfunction	Normal communication between the skid control ECU and the steering angle sensor and abnormal steering angle sensor zero point.	ECU-B NO. 2 fuse ECU-IG NO. 3 fuse Steering angle sensor (Spiral cable with sensor sub-assembly) Skid control ECU (Brake actuator assembly) Wire harness or connector

WIRING DIAGRAM

Refer to DTC C1432 (See page CAUTION / NOTICE / HINT ).

CAUTION / NOTICE / HINT

NOTICE:

Do not remove the steering angle sensor from the spiral cable with sensor sub-assembly.
When replacing the steering angle sensor (spiral cable with sensor sub-assembly), 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 U0073, U0124 and/or U0126 is output together with C1434, inspect and repair the trouble areas indicated by U0073, U0124 and/or U0126 first (See page ).
When any of the speed sensors or the yaw rate and acceleration sensor (airbag sensor assembly) has trouble, DTCs for the steering angle sensor (spiral cable with sensor sub-assembly) may be output even when the steering angle sensor (spiral cable with sensor sub-assembly) is normal. When DTCs for the speed sensors or yaw rate and acceleration sensor (airbag sensor assembly) are output together with DTCs for the steering angle sensor (spiral cable with sensor sub-assembly), inspect and repair the speed sensor and yaw rate and acceleration sensor (airbag sensor assembly) first, and then inspect and repair the steering angle sensor (spiral cable with sensor sub-assembly).

PROCEDURE

CHECK DTC

(a) Clear the DTCs (See page (b) Turn the ignition switch off. ).

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON again and check that no CAN communication system DTC is output (See page (d) Start the engine. ).

(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 to check that no speed sensor or yaw rate and acceleration sensor DTCs are output (See page ).

HINT:

If there is a malfunction in any of the speed sensors or the yaw rate and acceleration sensor (airbag sensor assembly), an abnormal value may be output although the steering angle sensor (spiral cable with sensor sub-assembly) sensor is normal.
If speed sensor and yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output simultaneously, repair these two sensors first and inspect the steering angle sensor (spiral cable with sensor sub-assembly).

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

CHECK CAN COMMUNICATION SYSTEM

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

2.	CHECK TERMINAL VOLTAGE (BAT TERMINAL)

(a) Turn the ignition switch off.

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

(d) Disconnect the S32 steering angle sensor (spiral cable with sensor sub-assembly) connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S32-5 (BAT) - Body ground	Always	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Steering Angle Sensor [Spiral Cable with Sensor Sub-assembly])

REPAIR OR REPLACE HARNESS OR CONNECTOR (BAT CIRCUIT)

3.	CHECK TERMINAL VOLTAGE (IG TERMINAL)

(a) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
S32-4 (IG) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Steering Angle Sensor [Spiral Cable with Sensor Sub-assembly])

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT)

4.	CHECK HARNESS AND CONNECTOR (ESS 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
S32-1 (ESS) - Body ground	Always	Below 1 Ω

Text in Illustration

*a	Front view of wire harness connector (to Steering Angle Sensor [Spiral Cable with Sensor Sub-assembly])

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 page ).

REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (ESS CIRCUIT)

Steering Angle Sensor Internal Circuit (C1433)

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Yaw Rate Sensor Malfunction (C1436)

DESCRIPTION The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system. The airbag sensor ...

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