Toyota Camry Hybrid AHV40 Manual page 255

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Fuel Tank Internal Pressure High or Low
Vent Valve (Vent / Close)
Leak Detection Pump (ON / OFF)
Purge VSV (Open / Close)
Fuel Vapor-containment Valve (Open / Close)
Fuel Tank Pressure Sensor
Atmospheric Pressure (0 kPa)
Fuel Tank Pressure Sensor
Atmospheric Pressure (0 kPa)
Canister Pressure Sensor
at Leak Detection Pump
Order Operation
Atmospheric
1 1 Pressure Pressure
Measurement
0.02 in. Leak
Pressure
2 2 Pressure
Measurement
3 3 Canister Leak Check Canister Leak Check
4 Purge VSV Monitor
0.02 in. Leak 0.02 in. Leak
Pressure
5
Measurement and Measurement and
Format
Fuel
Vapor-containment V i
6
Valve Stuck Closed Valve Stuck Closed
Judgment
7 Final Check
ENGINE - 2AZ-FXE ENGINE
A
1
Description
THS ECU turns vent valve OFF (vent) and measures
EVAP system pressure to memorize atmospheric EVAP system pressure to memorize atmospheric
pressure.
Leak detection pump creates negative pressure (vacuum)
through 0 02 in orifice and pressure is measured THS
through 0.02 in. orifice and pressure is measured. THS
ECU determines this as 0.02 in. leak pressure.
Leak detection pump creates negative pressure (vacuum)
in canister leak check and canister leak check pressure is
measured. If stabilized pressure is larger than 0.02 in.
leak pressure, THS ECU determines EVAP control leak pressure THS ECU determines EVAP control
system has leak.
If leak detection pump pressure does not stabilize within
15 minutes, THS ECU cancels EVAP monitor.
THS ECU opens purge valve and measures EVAP
control system pressure increase. If increase is large,
THS ECU interprets this as normal.
Leak detection pump creates negative pressure (vacuum)
through 0.02 in. orifice and pressure is measured. THS through 0.02 in. orifice and pressure is measured. THS
ECU determines this as 0.02 in. leak pressure.
THS ECU turns vent valve OFF (vent) and measures THS ECU turns vent valve OFF (vent) and measures
canister leak check pressure to memorize atmospheric
pressure.
Leak detection pump creates a negative pressure p
(vacuum) in the fuel tank and the THS ECU measures the ( ) i h f l
pressure at the time the fuel vapor-containment valve is pressure at the time the fuel vapor-containment valve is
opened.
THS ECU measures atmospheric pressure and records
monitor result.
2 3 4 5 6
p g p
k d h THS ECU
EG-67
7
02HEG36Y
Time
10 sec. 10 sec
60 sec. 60 sec
Within Within
15 min.
10 sec.
60 sec. 60
and
10 sec. 10 sec
h
A Approx.
0 1 sec 0.1 sec.
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