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.
SYS.OK|MANUAL.DBβ LIVE
HOMESERVICE MANUALSSCION2015FR-S AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESVEHICLE STABILITY CONTROL SYSTEM (DIAGNOSTIC CODES & SYMPTOM TESTS)VEHICLE STABILITY CONTROL SYSTEMDTC 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 [05/2014 - ]DESCRIPTION
2015 Scion FR-S Automatic Trans
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 [05/2014 - ]: Description
2015 Scion FR-S Automatic TransSECTION Description
The skid control ECU (brake actuator assembly) receives signals from the ECM, steering sensor and TCM via the CAN communication system.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| U0073 | The +BS terminal voltage is between 9.6 and 16.5 V and bus off is judged for 0.1 seconds or more. | CAN communication system |
| U0100 | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle is being driven, and signals cannot be sent to the ECM for 0.5 seconds or more. |
|
| U0123 | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle is being driven, and signals cannot be sent to the TCM for 0.5 seconds or more. |
|
| U0126 | The +BS terminal voltage is between 9.6 and 16.5 V, the vehicle is being driven, and signals from the steering sensor cannot be received for 0.1 seconds or more. |
|
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.