The purge solenoid is a pneumatic device that meters the air and fuel (purge) vapor flow to thepurge port. In a sense, the purge solenoid is comparable to a fuel injector, because the meteredpurge flow follows the same slope and offset characteristics. However, the purge solenoidnormally runs with a duty cycle at a fixed frequency because the opening response is significantly slower than a fuel injector. It would not practical to run the solenoid synchronously with engine events except perhaps at very low RPM. The normal frequencies for the purge solenoid are between 8 and 20 Hz.
If there is Short in PCSV circuit, ECM sets DTC P0445.
Item
Detecting Condition
Possible Cause
DTC Strategy
Circuit continuity check, open
Poor connection
Open or Short to ground in power circuit
Open in control circuit
PCSV
Enable Conditions
Battery voltage 10.7 ~ 16V
Threshold Value
Short circuit to battery or Short circuit to ground
Diagnostic Time
Continuous
MIL ON Condition
3 driving cycle
Specification
PCSV Coil Resistance (O)
16.0 [20 ? 68 ?]
During normal operation, the PCSV opens and closes, depending on throttle angle and intake manifold vacuum. When it opens, fuel vapors are flushed from the canister and drawn into the intake manifold. To avoid a vacuum build-up in the canister, the canister close valve is normaly held open to alow fresh air to replace the vapors drawn into the intake manifold. The given data is the signal waveform when the PCSV operates normaly. Note that the PCSV will not operate until the engine has reached normal operating temperature.