Canister Purge Control Solenoid (CPCS)

The CPCS allows fuel vapor to flow from carbon canister to the engine. CPCS is normally closed and is pulse-width modulated by the PCM to precisely control vapor flow. PCM controls flow of fuel vapors based on coolant temperature. At temperatures greater than 113°F (45°C), purge control solenoid is open. Purge control solenoid is also opened if PCM detects extreme lean air/fuel mixture ratio conditions.