Bladder Tank Monitor - Toyota 2006 PRIUS Manual

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3) Bladder Tank Monitor

The vent valve and the purge VSV open, enabling the VSV (for purge flow switching valve) to keep the
passage between the fuel tank and the purge line open. Then, the air in the fuel tank is drawn in by the
vacuum of the intake manifold, and the density of HC in the exhaust gases is measured by the oxygen
sensor. Based on the measured density, the ECM detects the leakage of the bladder tank.
If a leak is detected, the MIL illuminates to inform the driver. Also, the DTC can be accessed through
the use of a hand-held tester.
For details, refer to the 2006 Prius Repair Manual (Pub. No. RM01R0U).
Atmosphere
NEW FEATURES - 1NZ-FXE ENGINE
Purge VSV (Open)
To Intake Manifold
Canister Pump Module
Vent
Valve
(OFF)
Bladder Tank
ECM
Oxygen Sensor
VSV (For Purge Flow Switching Valve)
Purge Line
(ON)
Fuel Tank
Canister
01REG09Y