Toyota CH-R Service Manual: Steering Angle Sensor Output Malfunction (C1434)

DESCRIPTION

The skid control ECU (brake actuator assembly) receives signals from the steering angle sensor via CAN communication.

HINT:

If there is a malfunction in the bus lines between the steering angle sensor and the CAN communication system, DTC U0126 (Lost Communication with Steering Angle Sensor Module) is output. When U0126 is output together with C1434, inspect and repair the trouble areas indicated by U0126 first.

DTCs may be stored if one of the following occurs:

  • Steering angle sensor zero point value malfunction.
  • Steering angle sensor signal malfunction.
  • Steering angle sensor signal stuck malfunction.
  • Steering angle sensor and the yaw rate sensor values inconsistent.
  • Steering angle sensor installation abnormality.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1434

Steering Angle Sensor Output Malfunction

Any of the following is detected:

  • The difference between zero point stored in the steering angle sensor and the estimated zero point exceeds 15 deg.
  • The offset value of the steering angle sensor is -13.5 deg. or less or 13.5 deg. or more.
  • The steering angle sensor value exceeds a specified value for 0.3 seconds or more.
  • The change of the steering angle sensor value within 0.02 seconds is abnormal.
  • The steering angle sensor value changes by less than 5 deg. and both left and right turns have been recognized.
  • There is a difference between the skid control ECU (brake actuator assembly) estimated value and the steering angle sensor value due to an abnormal steering angle sensor value.
  • Sensor installation
  • Steering angle sensor power supply
  • Steering angle sensor
  • Skid control ECU (brake actuator assembly)
DTC Detection Conditions: C1434
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Diagnosis Condition

-

-

-

-

Malfunction Status

The difference between zero point stored in the steering angle sensor and the estimated zero point exceeds 15 deg.

-

-

The offset value of the steering angle sensor is -13.5 deg. or less or 13.5 deg. or more.

-

-

The steering angle sensor value exceeds a specified value.

-

-

Detection Time

-

-

0.3 seconds or more

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

DTC Detection Conditions: C1434
 

Vehicle Condition

Pattern 4

Pattern 5

Pattern 6

Diagnosis Condition

-

-

-

-

Malfunction Status

The change of the steering angle sensor value within 0.02 seconds is abnormal.

-

-

The steering angle sensor value changes by less than 5 deg. and both left and right turns have been recognized.

-

-

There is a difference between the skid control ECU (brake actuator assembly) estimated value and the steering angle sensor value due to an abnormal steering angle sensor value.

-

-

Detection Time

-

-

-

Number of Trips

1 trip

1 trip

1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

HINT:

  • When U0073, U0123 and/or U0126 is output together with C1434, inspect and repair the trouble areas indicated by U0073, U0123 and/or U0126 first.

    Click here

  • When a speed sensor or the yaw rate and acceleration sensor (airbag sensor assembly) is malfunctioning, DTCs for the steering angle sensor may be stored even though the steering angle sensor is normal. When DTCs for a speed sensor or yaw rate and acceleration sensor (airbag sensor assembly) are output together with DTCs for the steering angle sensor, inspect and repair the speed sensor or yaw rate and acceleration sensor (airbag sensor assembly) first, and then inspect and repair the steering angle sensor.

PROCEDURE

1.

CHECK DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC/EPB > Clear DTCs

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON again and check that no CAN communication system DTCs are output.

Click here

(d) Start the engine.

(e) Drive the vehicle at a speed of 50 km/h (31 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.

Click here

Chassis > ABS/VSC/TRAC/EPB > Trouble Codes

Result

Proceed to

No CAN communication system, speed sensor, or yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output.

A

CAN communication system DTCs are output.

B

Speed sensor and/or yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output.

C

HINT:

  • If a speed sensor or the yaw rate and acceleration sensor (airbag sensor assembly) is malfunctioning, 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 (airbag sensor assembly) DTCs are output simultaneously, repair these malfunctions and then inspect the steering angle sensor.
B

INSPECT CAN COMMUNICATION SYSTEM

C

REPAIR CIRCUIT INDICATED BY OUTPUT DTC

A

2.

CHECK STEERING ANGLE SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check that the steering angle sensor has been installed properly.

Click here

OK:

The steering angle sensor installation is normal.

NG

INSTALL STEERING ANGLE SENSOR CORRECTLY

OK

3.

CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Remove the steering wheel and column cover.

*a

Front view of wire harness connector

(to Steering Angle Sensor)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(c) Disconnect the F69 steering angle sensor connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F69-5 (BAT) - Body ground

Always

11 to 14 V

F69-4 (IG1) - Body ground

Ignition switch ON

11 to 14 V

Result

Proceed to

OK

A

NG

B

B

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

A

4.

CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

(a) Turn the ignition switch off.

*a

Front view of wire harness connector

(to Steering Angle Sensor)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E69-1 (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 before replacing parts.

Click here

OK

REPLACE STEERING ANGLE SENSOR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

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