Toyota Camry Hybrid AHV40 Manual page 253

3) EVAP Leak Check
a. General
D The following are the typical conditions for enabling an EVAP leak check:
Typical Enabling Condition
*: If engine coolant temperature does not drop below 35_C (95_F), this time should be extended to 7
hours. Even after that, if the temperature is not less than 35_C (95_F), the time should be extended
to 9.5 hours.
D The THS ECU performs EVAP leak checks through two types of judgment methods.
a) When the internal pressure in the fuel tank is equal to the atmospheric pressure:
- The THS ECU actuates the leak detection pump to introduce a vacuum into the fuel pipe and
canister, in order to check for leakage and check the functions of the parts.
- The THS ECU actuates the leak detection pump and opens the fuel vapor-containment valve to
introduce a vacuum into the fuel tank, in order to check the fuel tank for leakage and determine
whether the fuel vapor-containment valve is stuck closed.
b) When the internal pressure in the fuel tank is higher or lower than the atmospheric pressure:
- If the internal pressure of the fuel tank is high or low, the THS ECU determines that there is no
leakage in the fuel tank, based on the holding state of the internal pressure in the fuel tank.
- The THS ECU actuates the leak detection pump to introduce a vacuum into the fuel pipe and
canister, in order to check for leakage and check the functions of the parts.
- With the leak detection pump stopped, the THS ECU opens the fuel vapor-containment valve to
introduce the internal pressure of the fuel tank into the fuel pipe and the canister, in order to
determine whether the fuel vapor-containment valve is stuck closed.
Service Tip
The canister pump module performs EVAP leak check. This check is done approximately five
hours after engine is turned OFF. So you may hear sound coming from underneath the luggage
compartment for several minutes. It does not indicate a malfunction.
ENGINE - 2AZ-FXE ENGINE
D 5 hour have elapsed after the engine has been turned OFF.*
D Altitude: Below 2400 m (8000 feet)
D Auxiliary Battery Voltage: 10.5 V or more
D Power Source Mode: OFF
D Engine Coolant Temperature: 4.4 to 35_C (40 to 95_F)
D Intake Air Temperature: 4.4 to 35_C (40 to 95_F)
EG-65