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Home >> Pontiac >> 2007 >> Vibe Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - Introduction (2 Of 2) >> Description and Operation >> Evaporative Emission Control System Description >> Small Leak Test

Small Leak Test

If the large leak test passes, the PCM will continue to monitor the FTP sensor signal in order to determine if there is small leak. If a specified minimum value is not achieved or the minimum value can not be maintained, a DTC P0456 can set. This diagnostic can detect leaks as small as 0.5 millimeter (0.020 inch) between the fuel fill cap and the purge valve.

Evaporative Emission Control System Description

Diagnostic Event Sequence Event Two Event Three
EVAP Purge Solenoid OFF/CLOSED OFF/CLOSED
EVAP Vent Solenoid OFF/OPEN ON/CLOSED
Vacuum Leak Pump ON ON
FTP Sensor Small Negative Pressure Change Negative Pressure Increase and Hold
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