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 from the canister to the intake manifold.
The PCM sets DTC P0441 if the pressure signal decrease occurs and the difference is below the predetermined threshold. If same error code is set in the next driving cycle, the PCM illuminates the MIL.
Item | Detecting Condition & Fail Safe | Possible Cause | |
DTC Strategy | case 1 |
•
Monitoring Fuel Tank Pressure & pressure difference after shut off valve closed | 1. Leakage on hose to PCSV 2. Faulty PCSV |
case 2 |
•
Monitoring Fuel Tank Pressure during Vapor Generation check | ||
Enable Conditions |
•
Coolant temperature > 74℃(165℉)
•
Ambient air temperature model > -10℃(14℉)
•
Vehicle speed < 10km/h(6mph)
•
Time after start > 590 Seconds
•
Limited Canister saturation
•
Estimated altitude < 2.4km(8000ft)
•
Canister load < 1
•
Minimum canister purge time : 3~25 Seconds
•
11V < Battery voltage < 16V | ||
Threshold Value | case 1 |
•
Differential fuel tank Pressure < -1700 Pa and Pressure difference after shut off valve closed > 200 Pa | |
case 2 |
•
Differential fuel tank Pressure < -200 Pa | ||
Diagnostic Time |
•
0.5 Seconds | ||
Mil On Condition |
•
2 Drive Cycles | ||
