Evaporative emission control components (Emission control - V8) (page 6 of 9)

The following failure modes are possible: l Connector or harness wiring fault (open or short circuit) l Valve stuck open or shut l Valve blocked

If the CVS valve malfunctions, the following fault codes may be stored in the ECM diagnostic memory, which can be retrieved using 'Testbook':

Fuel Tank Pressure Sensor (NAS vehicles with vacuum type leak detection system only)

1 Ambient pressure 2 Tank pressure 3 Sensor cell

The fuel tank pressure sensor is located in the top flange of the fuel tank sender / fuel pump module and is a nonserviceable item (i.e. if the sensor becomes defective, the complete fuel tank sender unit must be replaced). The fuel tank pressure sensor connector is accessible through the fuel pump access hatch in the boot area floor of the vehicle.

The pressure sensor is a piezo-resistive sensor element with associated circuitry for signal amplification and temperature compensation. The active surface is exposed to ambient pressure by an opening in the cap and by the reference port. It is protected from humidity by a silicon gel. The tank pressure is fed up to a pressure port at the back side of the diaphragm.