P0441

System/Component
Evaporative Purge System
EVAP System Purge Valve
EVAP System Shut-off Valve
EVAP System Pressure Sensor

Fault Code
P0441

Fault Type
Plausibility Yes
Signal No
Minimum Threshold No
Maximum Threshold No

Monitoring Method
Pressure checks of EVAP system

Signal Type
Evaporative Purge System
ECM internal signal/value computation or comparison

EVAP system Purge Valve
pulsating rectangular wave on/off-cycles with constant or varying on/off-times

EVAP System Shut-off Valve
on/off switching signal

EVAP System Pressure Sensor
non-pulsating signal

Operating Range
Evaporative Purge System
T engine > 62°C

For EVAP System Purge Valve, EVAP System Shut-off Valve, and EVAP System Pressure Sensor, Evaporative Purge System Monitoring

Time Length and Frequency for Monitoring/Diagnosis
Evaporative Purge System
25 sec/once per trip

Criteria for storing fault code
Evaporative Purge System
fault during 2 trips

Criteria for illuminating the MIL
Evaporative Purge System
fault during 2 trips and end of 2nd trip

Criteria used for determining out of range values and input component rationality check
UBATT No
Ground No
Disconnect No

Electronic Control Module (ECM)
1) differential pressure of < -5 hPa means a faulty purge valve (hold in closed position)
2) differential pressure between 0 to -2 hPa during purging means a big system leakage (e.g. missing fuel filler cap), or -2 to -3.5 hPa means a faulty purge condition.
3) differential pressure increase is >1.5 hPa (after 7.8 sec) means a system leakage of ≥1 mm.
4) differential pressure of -28 hPa during system purging means a faulty shut-off valve (hold in closed position).