Toyota Camry Hybrid AHV40 Manual page 256

EG-68
b. Atmospheric Pressure Measurement
1) When the power source mode is selected to OFF, the purge VSV and the fuel vapor-containment
valve are OFF (close). Therefore, the atmospheric pressure is introduced into the canister.
2) The THS ECU measures the atmospheric pressure through the signals provided by the canister
pressure sensor.
3) If the measurement value is out of standards, the THS ECU actuates the leak detection pump in order
to monitor the changes in the pressure.
4) If the THS ECU does not detect changes in the pressure, it stops the leak check and store DTC
(Diagnostic Trouble Code) P0450, P0451 in its memory.
THS
ECU
Purge VSV
(Close)
" Fuel Tank Internal Pressure Equals Atmospheric Pressure A
Vent Valve (Vent)
Leak Detection Pump (OFF)
Purge VSV (Close)
Fuel Vapor-containment
Fuel Tank Pressure Sensor
Atmospheric Pressure (0 kPa)
Canister Pressure Sensor
at Leak Detection Pump
ENGINE - 2AZ-FXE ENGINE
Atmospheric
Leak Detection
Pump (OFF)
Valve (Close)
Atmospheric Pressure Measurement
Fuel Vapor-containment
Valve (Close)
Fuel Tank
Pressure Sensor
Canister Pressure Sensor
" Fuel Tank Internal Pressure High or Low A
Vent Valve (Vent)
Leak Detection Pump (OFF)
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
Atmospheric Pressure Measurement
Canister
Vent Valve
(Vent)
Canister Pump
Module
02HEG37Y
02HEG38Y