Fuel Evaporative Emission System; Evaporative Emission Canister Purge Solenoid Valve; Purge Flow Sensor; Description - Mazda B-Series 1997 Workshop Manual

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FUEL EVAPORATIVE EMISSION SYSTEM (FOR 2.3L 13.OL 14.OL)
FUEL EVAPORATIVE EMISSION SYSTEM (FOR 2.3L 13.OL 14.OL)
DESCRIPTION
The fuel evaporative emission system consists of the fuel vapor valve, evaporative emission canister,
evaporative emission canister purge solenoid, purge flow sensor, powertrain control module (PCM) and
input devices. The amount of evaporative fumes introduced into the engine and burned is controlled by
the solenoid corresponding to the engine's operating conditions. To provide the best engine perfor-
mance, the solenoid is controlled by the PCM using an input signal from the purge flow sensor.
5BUOF3-114
Evaporative Emission Canister Purge Solenoid Valve
If the evaporative emission canister purge solenoid valve or circuit has an open or short, Diagnostic
Trouble Code No. PO443 is output.
If the circuit is open, no driveability symptom will be noticed.
If the circuit is shorted, the engine may stall at low speed.
A short circuit may cause an improper aidfuel ratio, causing rough idle and hard starting.
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Purge Flow Sensor
If the purge flow sensor circuit has an open or short, Diagnostic Trouble Code No. PI444 or PI445 is
output.
If the purge flow sensor circuit is open or shorted, no driveability symptom will be noticed.
If purge flow is malfunctioning, DTC No. P1443 is output.
6BUOFT-219