B2300 SE Regular Cab 2WD L4-2.3L VIN A (1997)
Canister Purge Solenoid: Description and Operation
EVAP CANISTER PURGE SOLENOID
Controls flow of vapors from carbon canister to intake manifold during various engine operating modes.
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Solenoid is a normally closed valve.
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Solenoid ground is controlled by PCM.
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Ground signals are cycled on/off at 10 Hz frequency with a variable duty cycle.
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If the evaporative emission canister purge solenoid valve or circuit has an open or short, Diagnostic Trouble Code No. P0443 is output.
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If the circuit is open, no driveability symptom will be noticed.
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If the circuit is shorted, the engine may stall at low speed.
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A short circuit may cause an improper air/fuel ratio, causing rough idle and hard starting.
Operation
The evaporative emission canister purge solenoid is controlled by signals from the PCM to perform purging of the evaporative emission canister.
The purge flow sensor monitors vapor flow through the evaporative emission canister purge solenoid and signals the PCM of flow or no flow
conditions. The PCM monitors this signal and other input signals regarding engine condition. Purging is done when the following conditions are
met:
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After warm up
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Accelerator pedal depressed (off idle)
