S60 T5 L5-2.3L Turbo VIN 53 B5234T3 (2002)
The Differential Electronic Module (DEM) receives signals from the Engine Control Module (ECU) and the Brake Control Module (BCM) via the
Control Area Network (CAN). The Differential Electronic Module (DEM) uses the sensor signals to control the oil pressure to the multi-plate clutch
by adjusting the axial solenoid. The axial solenoid regulates the control valve constantly using a Pulse Width Modulation (PWM) signal. The oil
pressure for the multi-plate clutch determines the amount of torque which can be transferred to the rear wheels.
Note: If the car has Dynamic Stability And Traction Control (DSTC), the required stability control is applied before fourwheel drive.
Active On-demand Coupling (AOC) has an oil pressure and temperature sensor, which gauge the prevailing temperature and pressure of the hydraulic
fluid. The oil pressure and temperature sensor provide the Differential Electronic Module (DEM) with information about the temperature and
pressure. Four wheel drive is disengaged to protect the coupling unit from damage if the temperature becomes too high, above 97°C. The coupling
unit is re-engaged at full function when the temperature falls below 93°C.
Mechanical function, overview
1. Pressure plate
2. Rollers for the annular piston
3. Rollers for the operating piston
4. Annular piston
5. Operating piston
6. Input shaft
7. Cam disc
8. Housing for the outer plates
9. Outer plates
10. Inner plates
11. Springs
12. 0utput shaft.
The transmission transfers engine torque to the propeller shaft. The input shaft is separate from the output shaft. The multi-plate clutch in the coupling