EGR Related Controls (exhaust gas recirculation) and the cleaning control system are placed inside the control box on the bulkhead. These components include the EGR control solenoid valve, CVC valve and airbox if used, and the purge shutoff solenoid valve.
Replacing any of these devices requires removing the control box from its mountings, disconnecting the external electrical connectors, and opening the control box. Disconnect the vacuum hose (And) away from the device and remove the device. Installation is carried out in the reverse order.