Air Injection System: Description
The air injection system reduces Hydrocarbon (HC) and Carbon Monoxide (CO) emissions by supplying filtered air to exhaust manifold. On Pulsar NX and Sentra, the system consists of an air temperature sensor, air injection control solenoid valve, air injection valve, air cleaner and water temperature sensor. The Electronic Control Unit (ECU) coordinates function of the air injection valve. On Pulsar NX SE, the system consists of an air injection valve, air temperature sensor, coolant temperature sensor and thermal vacuum valve.
On Maxima and 200SX SE, system includes an air injection valve, air injection control solenoid valve, pressure regulator control solenoid valve, water temperature sensor and Electronic Concentrated Engine Control System (ECCS) control unit. The air injection valve is controlled by the ECCS control unit, corresponding to engine temperature.