Toyota 2GR-FE Manual page 424

ES–268
DTC
DTC SUMMARY
DTC No. Monitoring Item
EVAP VSV
P0441 (Vacuum Switching
Valve) stuck open
ES
EVAP VSV stuck
P0441
closed
P0441 Purge flow
DESCRIPTION
The circuit description can be found in the EVAP (Evaporative Emission) System (See page ES-400).
INSPECTION PROCEDURE
Refer to the EVAP System (See page ES-400).
MONITOR DESCRIPTION
The two monitors, Key-off and Purge Flow, are used to detect malfunctions relating to DTC P0441. The
key-off monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours* after the engine
switch is turned off. The purge flow monitor runs while the engine is running.
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Evaporative Emission Control System Incorrect
P0441
Purge Flow
DTC Detection Condition
Vacuum 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 EVAP VSV stuck open
After EVAP leak check
performed, EVAP 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
While engine running, following
conditions are successively met:
• Negative pressure not
created in EVAP system
when EVAP VSV turned ON
(open)
• EVAP system pressure
change less than 0.5 kPa
(3.75 mmHg) when vent
valve turned ON (closed)
• Atmospheric pressure
change before and after
purge flow monitor less than
0.1 kPa (0.75 mmHg)
Trouble Area
• EVAP VSV
• Connector/wire harness
(EVAP VSV - ECM)
• ECM
• Pump module
• Leakage from EVAP system
• EVAP VSV
• Connector/wire harness
(EVAP VSV - ECM)
• ECM
• Pump module
• Leakage from EVAP system
• EVAP VSV
• Connector/wire harness
(EVAP VSV - ECM)
• Leakage from EVAP line
(EVAP VSV - Intake manifold)
• ECM
Detection
Detection Timing
Logic
While engine
2 trip
switch off
While engine
2 trip
switch off
While engine
2 trip
running