Toyota Tacoma manuals

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

DESCRIPTION

Steering angle sensor (spiral cable with sensor sub-assembly) signals are sent to the skid control ECU (master cylinder solenoid) via the CAN communication system. When there is a malfunction in the CAN communication system, it is detected by the steering angle sensor (spiral cable with sensor sub-assembly) zero point malfunction diagnostic function.

DTC Code

DTC Detection Condition

Trouble Area

C1434

An error in communication between the skid control ECU (master cylinder solenoid) and the steering angle sensor, or an 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) power supply
  • Steering angle sensor (spiral cable with sensor sub-assembly)

WIRING DIAGRAM

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

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, 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 stored 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

1.

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, and then check that no speed sensor or yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output (See page Result Result ).

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 (airbag sensor assembly), an abnormal value may be output although the steering angle sensor (spiral cable with sensor sub-assembly) is normal.
  • If speed sensor and yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output simultaneously, repair these two sensors first, and then inspect the steering angle sensor (spiral cable with sensor sub-assembly).
B

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

C

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A

2.

INSPECT STEERING ANGLE SENSOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY) (IG, BAT TERMINAL)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

3.

INSPECT STEERING ANGLE SENSOR (SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY) (ESS TERMINAL)

OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

Steering Angle Sensor Internal Circuit (C1433)
DESCRIPTION Steering angle sensor (spiral cable with sensor sub-assembly) signals are sent to the skid control ECU (master cylinder solenoid) via the CAN communication system. When there is a mal ...

Yaw Rate Sensor Malfunction (C1436)
DESCRIPTION The skid control ECU (master cylinder solenoid) receives signals from the yaw rate and acceleration (airbag sensor assembly) via the CAN communication system. The airbag sensor assembl ...

Other materials:

Precaution
PRECAUTION 1. IGNITION SWITCH EXPRESSIONS (a) The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section. Expression Ignition Switch (Position) Engine ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

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