Purge Valve

WARNING: This page is about a different car, the 2018 Jaguar XF, 2017 Jaguar XF, and 2016 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

The purge valve is located on the left side of the engine, below the ignition coil cover. The purge valve is a solenoid operated valve which is closed when de-energized.

A vapor pipe is routed from the purge valve to the inlet of the supercharger.

The purge valve is controlled by the Engine Control Module (ECM) and is operated when the engine operating conditions are correct to allow purging of the evaporative emissions canister.

The purge valve is operated at 10 Hz by a Pulse Width Modulation (PWM) control ground from the ECM. The purge valve receives a fused power supply from the Engine Junction Box (EJB). At this high frequency, pulses of fuel vapor flow into the intake of the supercharger in an almost continuous flow. The valve operates at a duty cycle of between 7% and 100%.

Atmospheric pressure in the evaporative emissions canister is higher than the pressure at the supercharger inlet under all throttle settings and engine running conditions. This pressure differential allows vapor to be drawn from the evaporative emissions, through the open purge valve and into the supercharger air intake.