Circuit Description

The YSC relay supplies battery voltage to 4 valve solenoids (priming, charging, supply and YSC). The EBCM microprocessor applies the grounds needed in order to activate each solenoid. The low side of each solenoid coil has a feedback circuit to the EBCM microprocessor. When a solenoid is commanded OFF, the feedback voltage is high. When a solenoid is commanded ON, the feedback voltage is low.