EGR Valve: Description and Operation

VALVE

DESCRIPTION

The EGR Valve consists of three major components:

- EGR Valve
- EGR Solenoid
- EGR Tube




The EGR Valve (3) is located at the right rear of the engine and is attached to the right cylinder head, to the right of the Throttle Body (4). The EGR Solenoid (2) is attached to the EGR Valve (3) on the throttle body side of the valve. The EGR Tube (1) connects the EGR Valve (3) to the rear of the Intake Manifold (5).

OPERATION

The Exhaust Gas Recirculation flow is determined by the Powertrain Control Module (PCM). For a given set of conditions, the PCM calculates the ideal exhaust gas recirculation flow to minimize NOx emissions and maximize fuel economy by adjusting the pintle position. Pintle position is controlled by the EGR Solenoid. The PCM adjusts the duty cycle of the power supplied to the solenoid coil to obtain the correct position.