0.02 In. Leak Pressure Measurement - Toyota 2006 PRIUS Manual

c. 0.02 in. Leak Pressure Measurement
1) The vent valve remains OFF, and the ECM 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 0.02 in. leak pressure due to the atmospheric
pressure that enters through a 0.02 in. diameter reference orifice.
3) The ECM compares the logic value with 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 ECM will determine that the reference orifice
is clogged and store DTC (Diagnostic Trouble Code) P043E in its memory.
5) If the measurement value is above the standard, the ECM will determine that a high flow rate pressure
is passing through the reference orifice and store DTCs P043F, P2401 and P2402 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) ECM
Vent
Valve
(OFF)
ON
OFF

0.02 in. Leak Pressure Measurement

VSV (For Purge Flow Switching Valve)
(OFF)
01REG06Y
25
NF
275TU48