Pressure Monitoring Module

The pressure monitoring module controls most electrical activity in the hydraulic unit, including the following functions:

1. Pump Motor Control
   
   The pressure monitoring module receives an accumulator pressure input from two switches in the sensor block assembly. The module then commands the pump on and off to adjust accumulator pressure to its normal operating range. See PUMP/MOTOR ASSEMBLY  under OPERATION for more detail.
2. BRAKE Warning Lamp Control
   
   The pressure monitoring module also can illuminate the BRAKE warning indicator lamp in the event of low accumulator pressure or an internal pressure switch failure.
3. System Fault Communication
   
   The module communicates low pressure conditions and other internal problems to the EBCM by means of the system fault line.
4. Valve Relay Control
   
   The pressure monitoring module grounds the valve relay coil when commanded to do so by the EBCM. The EBCM commands the valve relay on by grounding the valve relay actuation line. The pressure monitoring module can disable the valve relay without being told to do so by the EBCM in the case of very low pressure and internal module failures.