Repeat 0.02 In. Leak Pressure Measurement - Toyota 2006 PRIUS Manual

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f. Repeat 0.02 in. Leak Pressure Measurement
1) While the ECM operates the vacuum pump, the purge VSV and vent valve turn OFF and a repeat
0.02 in. leak pressure measurement is performed.
2) The ECM compares the measured pressure with the pressure memorized in vacuum introduction.
3) If the pressure memorized in vacuum introduction is below the measured value, the ECM determines
that there is no leakage.
4) If the pressure memorized in vacuum introduction is above the measured value and near atmospheric
pressure, the ECM determines that there is a gross leakage (large hole) and stores DTC P0455 in its
memory.
5) If the pressure memorized in vacuum introduction is above the measured value, the ECM determines
that there is a small leakage and stores DTC P0456 in its memory.
Atmosphere
Leak Detection Pump
Canister Pressure Sensor
Reference Orifice
ON (Open)
Purge VSV
OFF (Close)
ON
Vent Valve
OFF (Vent)
Leak Detection Pump
Atmospheric Pressure
System Pressure
0.02 in. Leak Pressure
NEW FEATURES - 1NZ-FXE ENGINE
Purge VSV
(OFF)
Vent
Valve
(OFF)
ON
OFF
VSV (For Purge Flow Switching Valve)
ECM
(OFF)
P0455
P0456
Normal
Repeat 0.02 in. Pressure Measurement
01REG06Y
01REG11Y