What is MASC? Description and operating principle

What is MASC? Description and operating principle

MASC (Mitsubishi Active Stability Control) is a stability control system installed on Mitsubishi cars. It prevents skidding and improves traction and the vehicle’s manoeuvrability.

How MASC works

MASC determines the actual path of the vehicle by measuring the wheel speed, yaw rate, and lateral and longitudinal acceleration rate. Sensors transmit data on the steering wheel angle, brake fluid pressure, and brake pedal position to provide information about the driver’s actions.

If the actual path of the car doesn’t match the intended one, the system starts to slow down individual wheels and limit the engine torque. The ABS pump and valves, which can increase the pressure in a desired brake circuit, are used to activate the brakes. Engine torque is limited by changing the throttle position and/or switching off the fuel injectors.

Popular Mitsubishi cars equipped with MASC

Reasons for malfunction

  • Oxidation of the ABS, yaw rate, and lateral acceleration sensor contacts
  • Mass airflow sensor failure. 
  • Installation of different sized tyres
  • Use of a space-saver spare wheel
  • Failure of the steering wheel angle sensor.
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