Toyota 2GR-FE Manual page 538

ES–382
Operation A:
Atmospheric Pressure Measurement
Purge VSV:
OFF
0.02 Inch Orifice
Pressure Sensor
Vacuum Pump: OFF
Operation C: EVAP System Pressure Measurement
ES
The vent valve turns ON (closes) and the EVAP (Evaporative Emission) system pressure is then
measured by the ECM, using the pressure sensor, to conduct an EVAP leak check. If the pressure does
not increase when the vent valve is open, the ECM interprets this as the vent valve being stuck open. The
ECM illuminates the MIL and sets the DTC.
EVAP Pressure when Vent Valve Stuck OFF:
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Negative
First 0.02 Inch
Leak Pressure
Standard
Sequence
Time
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Canister
Vent Valve: OFF (vent)
Air Filter
OFF
ON
A B
10 seconds
60 seconds
Operation B, E:
0.02 Inch Leak Pressure Measurement
Fuel Tank
Pump Module
ON (closed)
Atmospheric
Pressure
Negative
Pressure
ON
ON
OK
Malfunction
C
With 15 minutes
OFF
ON
Operation D: Purge VSV Monitor
ON
ON
ON: Open
ON
ON: Closed
D E
10 60 seconds
seconds
OFF
(vent)
ON
(closed)
A096746E32
OFF: Closed
OFF: Vent
F
G036780E10