QX4 2WD V6-3.5L (VQ35DE) (2003)
Vacuum Pump: Description and Operation
Automatic Speed Control Device (ASCD)
ASCD PUMP OPERATION
The ASCD pump consists of a vacuum motor, an air valve and a release valve. When the ASCD activates, power is supplied
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from terminal 12 of ASCD control unit
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to ASCD pump terminal 1.
Ground is supplied to vacuum motor, air valve and release valve from ASCD control unit depending on the operated condition.
The pump is connected to ASCD actuator by vacuum hose. When the ASCD pump is activated, the ASCD pump vacuum the diaphragm of ASCD
actuator to control throttle cable.