Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA201886 GT, STANDARD TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESTRACTION CONTROLVEHICLE STABILITY CONTROL SYSTEM - DIAGNOSTIC CODES & SYMPTOM TESTSVEHICLE STABILITY CONTROL SYSTEMDIAGNOSTIC CODESDTC C1231: STEERING ANGLE SENSOR [06/2016 - ]CAUTION / NOTICE / HINT
2018 Toyota 86 GT, Standard Trans
Caution / Notice / Hint
2018 Toyota 86 GT, Standard TransSECTION Caution / Notice / Hint
NOTE:
- When replacing the steering sensor, perform VSC sensor neutral memorization (Refer to CALIBRATION [06/2016 - ] ).
- 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 (Refer to DTC U0073: Control Module Communication Bus "A" Off; DTC U0100: Lost Communication with ECM / PCM "A"; DTC U0101: Lost Communication with TCM; DTC U0126: Lost Communication with Steering Angle Sensor Module; DTC U0140: Lost Communication with Main Body ECU [06/2016 - ] ).
- 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.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.