The evaporative emission control system prevents hydrocarbon (HC) vapors from the fuel tank from escaping into the atmosphere where they could form photochemical smog. Gasoline vapors are collected in the charcoal canister. The PCM controls the Purge Control Solenoid Valve (PCSV) to purge any collected vapors from the canister back to the engine for combustlon. This valve is actuated by the purge control signal from the PCM and controls fuel vapor flow from the canister to the intake manifold.
If the PCSV is open stuck, the PCM determines that a fault exists and a DTC is stored.
Item
Detecting Condition
Possible cause
DTC Strategy
? Check Evap.Pressure
? Faulty PCSV
? Faulty PCM
Enable Conditions
? Vehicle speed = 30km/h(18.6 mph)
? Load Value : 20 ~ 85%
? Engine Coolant @ start < 60?(140?)
? Fuel Level(FL): 15 < FL < 85%
? Fuel Tank Pressure: 0.95 = FTP = 3.5V
Threshold value
? Pressure at certain point < -350mmAq(-0.5 psi, -3.4kPa)
Diagnosis Time
? Continuous
MIL On Condition
? 2 driving cycles