P0440 Evaporative emission (EVAP) system - malfunction
Possible causes: Hose connection(s), intake leak, EVAP canister purge valve
P0441 Evaporative emission (EVAP) system - incorrect flow detected
Possible causes: Hose connection(s), intake leak, EVAP canister purge valve
P0442 Evaporative emission (EVAP) system - small leak detected
Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
P0443 Evaporative emission (EVAP) canister purge valve - circuit malfunction
Possible causes: Wiring, EVAP canister purge valve, ECM
P0444 Evaporative emission (EVAP) canister purge valve -open circuit
Possible causes: Wiring open circuit, EVAP canister purge valve, ECM
P0445 Evaporative emission (EVAP) canister purge valve -short circuit
Possible causes: Wiring short circuit, EVAP canister purge valve, ECM
P0450 Evaporative emission (EVAP) pressure sensor - circuit malfunction
Possible causes: Wiring, EVAP pressure sensor, ECM
P0455 Evaporative emission (EVAP) system - large leak detected
Possible causes: Hose connection(s), intake leak, EVAP canister, EVAP canister purge valve
P0456 Evaporative emission system - very small leak detected
Possible causes: Mechanical fault, hose connection(s), EVAP pressure "sensor
P0457 Evaporative emission system - leak detected (fuel cap loose/off)
Possible causes: Mechanical fault, hose connection(s), EVAP pressure sensor
P0458 Evaporative emission system, purge control valve -circuit low
Possible causes: Wiring short to earth, EVAP valve
P0459 Evaporative emission system, purge control valve -circuit high
Possible causes: Wiring short to positive, EVAP valve
Evaporative Emission Purge Solenoid
Description & Operation
The duty cycle EVAP canister purge solenoid (DCP) regulates the rate of vapor flow from the EVAP canister to the intake manifold. The Powertrain Control Module (PCM) operates the solenoid.
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When de-energized, no vapors are purged. The PCM de-energizes the solenoid during open loop operation.
The engine enters closed loop operation after it reaches a specified temperature and the time delay ends. During closed loop operation, the PCM cycles (energizes and de-energizes) the solenoid 5 or 10 times per second, depending upon operating conditions. The PCM varies the vapor flow rate by changing solenoid pulse width. Pulse width is the amount of time that the solenoid is energized. The PCM adjusts solenoid pulse width based on engine operating condition.
Removal & Installation
The duty cycle evaporative (EVAP) canister purge solenoid is located in the engine compartment near the brake master cylinder.
COMPONENT TESTING
Carefully check for cracks or leaks in the vacuum lines or in the canister itself. The lines and fittings can be reached without removing the canister. Cracks or leaks in the system may cause poor idle, stalling, poor driveability, fuel loss or a fuel vapor odor.
Vapor odor and fuel loss may also be caused by: fuel leaking from the lines, tank or injectors, loose, disconnected or kinked lines, or an improperly seated air cleaner and gasket.
If the system passes the visual inspection and a problem is still suspected, proceed as follows:
REMOVAL & INSTALLATION
Canister Purge Solenoid Valve
See Figure 2
The purge solenoid valve is mounted on the engine, towards the rear and below the intake manifold.
Fig. Fig. 2: The canister purge solenoid is mounted below the intake manifold
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