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 MANUALSMITSUBISHI2012LANCER EVOLUTION GSRREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLACTIVE STABILITY CONTROL SYSTEM (ASC) - LANCER EVOLUTIONDIAGNOSISDIAGNOSTIC TROUBLE CODE PROCEDURESDTC C123B: PROLONGED OPERATION OF ASCNOTES

2012 Mitsubishi Lancer Evolution GSR

DTC C123B: Prolonged Operation Of ASC: Notes

2012 Mitsubishi Lancer Evolution GSRSECTION Notes

CAUTION:

If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, diagnose the CAN bus lines. Refer to EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS .
Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
When the steering wheel sensor is replaced or re-installed, always perform the calibration to make ASC-ECU learn the neutral point. (Refer to STEERING WHEEL SENSOR CALIBRATION .)
Do not drop the G and yaw rate sensor or subject it to a shock.
When the G and yaw rate sensor is replaced, always perform the calibration to make ASC-ECU learn the neutral point. (Refer to G AND YAW RATE SENSOR CALIBRATION .)
When the hydraulic unit (integrated with ASC-ECU) is replaced, always perform the calibration of steering wheel sensor, G and yaw rate sensor, brake fluid pressure sensor, cut valve, and inlet valve. (Refer to G AND YAW RATE SENSOR CALIBRATION , STEERING WHEEL SENSOR CALIBRATION , MASTER CYLINDER BRAKE FLUID PRESSURE SENSOR CALIBRATION , and CALIBRATION OF CUT VALVE AND INLET VALVE .)

RENDER: 1.0x

NO RELATED

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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.