Range Rover Sport (LS) V8-4.2L SC (2006)
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ramped slowly because the vapour concentration is unknown (a sudden increase in purge could cause the engine to flood). The concentration is then
determined from the amount of adjustment that the closed loop fuelling is required to make to achieve the target Air Fuel Ratio (AFR). Once the
concentration has been determined, the purge flow can be increased rapidly and the injected fuel can be proactively adjusted to compensate for the
known purge vapour and the target AFR control is maintained.
When the purging process is active, fresh air is drawn into the charcoal canister via the DMTL valve atmospheric vent connection and its filter on NAS
vehicles or, via the vent hose connection and the spider trap on non NAS vehicles
On NAS vehicles the system does not include a pressure test point. Pressure testing of the purge valve hose is achieved by disconnecting the purge valve
joint on the underside of the vehicle, forward of the fuel tank and connecting a special tool to allow the system to be pressure tested. The test performs a
pressure test on the purge hose connection forward of the fuel tank back to the charcoal canister. The special tool is then connected to the purge hose
connection forward of the fuel tank to perform a pressure test on the purge hose to the purge valve.
