DTC Summary

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

DTC No.	Monitoring Item	DTC Detection Condition	Trouble Area	Detection Timing	Detection Logic
P0441	Purge VSV (Vacuum Switching Valve) stuck open	Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure measured. 0.02 inch leak pressure standard measured at start and at end of leak check. If stabilized pressure higher than [second 0.02 inch leak pressure standard x 0.2], ECM determines that purge VSV stuck open	Purge VSV Connector / wire harness (Purge VSV - ECM) ECM Canister pump module Leakage from EVAP system	While ignition switch off	2 trip
P0441	Purge VSV stuck closed	After EVAP leak check performed, Purge VSV turned ON (open), and atmospheric air introduced into EVAP system. 0.02 inch leak pressure standard measured at start and at end of the check. If pressure does not return to near atmospheric pressure, ECM determines that purge valve stuck closed	Purge VSV Connector / wire harness (Purge VSV - ECM) ECM Canister pump module Leakage from EVAP system	While ignition switch off	2 trip
P0441	Purge flow	While engine running, following conditions are successively met: Negative pressure not created in EVAP system when Purge VSV turned ON (open) EVAP system pressure change less than 0.4 kPa (3.0 mmHg) when vent valve turned ON (closed) Atmospheric pressure change before and after purge flow monitor less than 0.1 kPa (0.75 mmHg)	Purge VSV Connector / wire harness (Purge VSV - ECM) Leakage from EVAP line (Purge VSV - Intake manifold) ECM	While engine running	2 trip

DTC No.

Monitoring Item

DTC Detection Condition

Trouble Area

Detection Timing

Detection Logic

P0441

Purge VSV (Vacuum Switching Valve) stuck open

Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure measured. 0.02 inch leak pressure standard measured at start and at end of leak check.
If stabilized pressure higher than [second 0.02 inch leak pressure standard x 0.2], ECM determines that purge VSV stuck open

Purge VSV
Connector / wire harness (Purge VSV - ECM)
ECM
Canister pump module
Leakage from EVAP system

While ignition switch off

2 trip

P0441

Purge VSV stuck closed

After EVAP leak check performed, Purge VSV turned ON (open), and atmospheric air introduced into EVAP system. 0.02 inch leak pressure standard measured at start and at end of the check.
If pressure does not return to near atmospheric pressure, ECM determines that purge valve stuck closed

Purge VSV

Connector / wire harness
(Purge VSV - ECM)

Canister pump module

Leakage from EVAP system

While ignition switch off

2 trip

P0441

Purge flow

While engine running, following conditions are successively met:

Negative pressure not created in EVAP system when Purge VSV turned ON (open)
EVAP system pressure change less than 0.4 kPa (3.0 mmHg) when vent valve turned ON (closed)
Atmospheric pressure change before and after purge flow monitor less than 0.1 kPa (0.75 mmHg)

Purge VSV

Connector / wire harness
(Purge VSV - ECM)

Leakage from EVAP line
(Purge VSV - Intake manifold)

While engine running

2 trip