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 ECM controls the Purge Control Solenoid Valve (PCSV) to purge any collected vapors from the canister back to the engine for combustion. This valve is actuated by the purge control signal from the ECM and controls fuel vapor from the canister to the intake manifold.
If the Reference value of differential tank pressure is below -0.2kPa, or over -0.03kPa, ECM determines that PCSV is Open stuck and sets DTC P0441.
Item
Detecting Condition
Possible Cause
DTC Strategy
Fuel tank pressure behavior
(Canister purge valve stuck check)
Leakage in each hose/fuel filler pipe
PCSV
ECM
Enable Conditions
Canister Close Valve close
Canister Purge Valve close
Time after engine start > 560 sec
ECT at start – IAT < 9.8?(49.64?)
0?(32?) < IAT temp < 42?(107.6?)
BARO > 74.5 kPa
15% < Fuel level < 85%
Duration of tank ventilation > 10 sec
Fuel System Status Closed loop
Accel. Pedal = 0%
Disable conditions : P0300 ~ P0308
Threshold Value
FTPS < -0.2 kPa or > -0.03kPa
Diagnostic Time
-
MIL On Condition
2 Driving Cycles
Coil resistance(?)
16 ± 2? ( at 20?/ 68?)
Fig.1) Normal waveform of PCSV under control condition.
The Purge Control Solenoid Valve(PCSV) is open or closed by ECM and vacuum of intake manifold.
At opening, fuel vapor from canister enters into intake manifold. To prevent vacuum from forming inside canister, ECM controls to open it. This photo shows the signal waveform of PCSV operating normally.