Circuit Description

The exhaust solenoid valve is switched on and off via the suspension control module. The control module provides a switched path to ground whenever exhaust activity is required and during a compressor "head-relief" sequence which occurs at compressor start-up if system pressure is lower than 68.95 kPa (10 psi). The control module continually monitors the exhaust solenoid valve circuitry to determine if the voltage level agrees with the commanded state.