C1231

BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1231; Steering Angle Sensor; 2013 MY FR-S [03/2012 -]
C1231 - Steering Angle Sensor

DESCRIPTION

The steering sensor signal is sent to the skid control ECU (brake actuator assembly) via the CAN communication system. When there is a malfunction in the CAN communication system, it will be detected by the steering sensor zero point malfunction diagnostic function.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* When replacing the steering sensor, perform VSC sensor neutral memorization Programming and Relearning.
* Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT
* When DTC U0073 and/or U0126 is output together with DTC C1231, inspect and repair the trouble areas indicated by DTC U0073 and/or U0126 first Vehicle Stability Control System.
* When the speed sensor or the yaw rate sensor has trouble, DTCs for the steering sensor may be output even when the steering sensor is normal. When DTCs for the speed sensor or yaw rate sensor assembly are output together with this steering sensor DTC, inspect and repair the speed sensor and yaw rate sensor assembly first, and then inspect and repair the steering sensor.

PROCEDURE

1. CHECK DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

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

(d) Drive the vehicle at a speed of 35 km/h (22 mph), turn the steering wheel to the right and left, and check that no speed sensor and yaw rate sensor DTCs are output Reading and Clearing Diagnostic Trouble Codes.

Result





HINT
* If there is a malfunction in the speed sensor or yaw rate sensor, an abnormal value may be output although the steering sensor is normal.
* If speed sensor and yaw rate sensor assembly DTCs are output together with this steering sensor DTC, inspect and repair the speed and yaw rate sensors first, and then inspect and repair the steering sensor.

B -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) How to Proceed With Troubleshooting

C -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC Vehicle Stability Control System
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the steering sensor connector.

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









Standard Voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (GROUND TERMINAL)

(a) Turn the ignition switch off.

(b) Disconnect the steering sensor connector.

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









Standard Resistance:





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

OK -- REPLACE STEERING SENSOR Removal