Dtc C1231/31 Steering Angle Sensor Circuit Malfunction


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)

INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL)

DTC C1231/31 Steering Angle Sensor Circuit Malfunction


DESCRIPTION

The steering angle sensor signal is 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
C1231/31
With ECU IG1 terminal voltage between 9.5 and 17.4 V, the steering angle sensor malfunction signal is received.
  1. Steering angle sensor (Spiral cable sub-assembly)
  2. Steering angle sensor circuit
  3. Steering angle sensor power supply

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1231/31 Steering Angle Sensor Circuit Malfunction


INSPECTION PROCEDURE

HINT:
  1. When U0073/94, U0123/62, U0124/95 and/or U0126/63 is output together with C1231/31, inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/95 and/or U0126/63 first (Toyota Fortuner RM0000026QM00JX.html).
  2. When the speed sensor or the yaw rate sensor assembly has trouble, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate sensor assembly are output together with this steering angle sensor DTC, inspect and repair the speed sensor and yaw rate sensor assembly first, and then inspect and repair the steering angle sensor.
NOTICE:
If the steering wheel is turned before tie rod end adjustment is completed, DTC C1231/31 may be stored (Toyota Fortuner RM00000164500YX.html).
1.CHECK FOR DTC

  1. Clear the DTC(s) (Toyota Fortuner RM000000XHV09NX.html).

  1. Turn the ignition switch off.

  1. Turn the ignition switch to ON again and check that no CAN communication system DTC is output.

  1. 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 sensor assembly DTCs are output (Toyota Fortuner RM000000XHV09NX.html).

    Result
    Result
    		Proceed to
    DTC C1231/31 output
    		A
    DTC relating to CAN communication system output
    		B
    DTC relating to speed sensor or yaw rate and acceleration sensor output
    		C
    HINT:
    1. If there is a malfunction in the speed sensor or yaw rate sensor assembly, an abnormal value may be output although the steering angle sensor is normal.
    2. If speed sensor and yaw rate sensor assembly DTCs are output together with this steering angle sensor DTC, inspect and repair the speed and yaw rate sensors first, and then inspect and repair the steering angle sensor.


B
INSPECT CAN COMMUNICATION SYSTEM

C
REPAIR CIRCUIT INDICATED BY OUTPUT DTC
A


2.INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1231/31 Steering Angle Sensor Circuit Malfunction

  1. Turn the ignition switch off.

  1. Disconnect the steering angle sensor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    S23-5 (IG) - Body ground
    		Ignition switch ON
    		11 to 14 V
    S23-6 (BAT) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK


3.INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Brake Control.Vehicle Stability Control System. Dtc C1231/31 Steering Angle Sensor Circuit Malfunction

  1. Turn the ignition switch off.

  1. Disconnect the steering angle sensor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S23-2 (ESS) - Body ground
    		Always
    		Below 1 Ω
    HINT:
    If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (Toyota Fortuner RM000000XHN092X.html).


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)
OK

REPLACE SPIRAL CABLE SUB-ASSEMBLY