MG MG6 Series 2011 Service Manual page 303

Engine Fuel & Management System
If the purge valve fails there is no back up system. TheEVAP
canister will not be purged, so there may be fuel vapours
released if levels reach saturation point. The driver may notice
this condition as a fuel vapour smell emanating from the vehicle
when parked.
The performance of the EVAP system is not monitored by
the ECM under the OBD legislation, therefore the only faults
which can be detected are electrical. If the ECM detects an
electrical fault in the driver circuit to the purge valve it will
store fault codes which can be retrieved using the diagnostic
tool.
Failure
The valve could fail in the following ways:
• Solenoid winding open circuit
• Solenoid winding short circuit
• External wiring short circuit to 12V
• External wiring short circuit to ground
• External wiring high resistance
• ECMnot providing a PWMsignal
• Mechanical defect in valve
Version 2.0
Engine
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