Toyota Camry Hybrid AHV40 Manual page 257

c. 0.02 in. Leak Pressure Measurement
1) The THS ECU turns OFF (vent) the vent valve, introduces atmospheric pressure into the canister,
and actuates the leak detection pump, in order to create a negative pressure.
2) At this time, the pressure will not decrease beyond a predetermined level due to the atmospheric
pressure that enters through a 0.02 in orifice.
3) The THS ECU compares the logic value and this pressure, and stores it as a 0.02 in. leak pressure
in its memory.
4) If the measurement value is below the standard, the THS ECU will determine that the reference
orifice is clogged and store DTC P043E in its memory.
5) If the measurement value is above the standard, the THS ECU will determine that a high flow rate
of pressure is passing through the 0.02 in. orifice and store DTC P043F, P2401 and P2402 in its
memory.
THS
Atmospheric
ECU
Purge VSV
(Close)
" Fuel Tank Internal Pressure Equals Atmospheric Pressure A
Vent Valve (Vent)
Leak Detection Pump (ON)
Purge VSV (Close)
Fuel Vapor-containment
Valve (Close)
Fuel Tank Pressure Sensor
Atmospheric Pressure (0 kPa)
Canister Pressure Sensor
at Leak Detection Pump
0.02 in. Pressure
0.02 in. Leak Pressure Measurement
ENGINE - 2AZ-FXE ENGINE
Fuel Tank
Pressure Sensor
Leak Detection
Pump (ON)
Canister Pressure Sensor
Fuel Vapor-containment
Valve (Close)
Canister
Vent Valve
(Vent)
Canister Pump
Module
" Fuel Tank Internal Pressure High or Low A
Vent Valve (Vent)
Leak Detection Pump (ON)
Purge VSV (Close)
Fuel Vapor-containment
Valve (Close)
Fuel Tank Pressure Sensor
Atmospheric Pressure (0 kPa)
Fuel Tank Pressure Sensor
Atmospheric Pressure (0 kPa)
Canister Pressure Sensor
at Leak Detection Pump
0.02 in. Pressure
0.02 in. Leak Pressure Measurement
EG-69
02HEG40Y
02HEG39Y