P0443

Diagnostic Chart:

Wiring Diagram:

The evaporative system (EVAP system) fuel vapors from the fuel tank into a charcoal canister to be used to meter the air/fuel ratio upon request. AN EVAP canister purge solenoid is used to control the flow of vapors from the EVAP canister to the intake manifold controlled by the PCM. The PCM controls the solenoid with a pulse modulated signal (PWM) on both its SOHC and DOHC engines. The PCM uses a generic field effect transistor driver (GFD) to control the solenoids ground when certain conditions have been met. The GFD driver has the capability to diagnose if the circuit has opened or shorted and can also monitor if the plunger has actually moved by the electrical diagnostic feedback circuit.

DTC PARAMETERS

DTC P0440 will set if the PCM has determined the EVAP canister purge solenoid has not moved when:

^ Engine is off idle

^ Commanded duty cycle is between 30-65%

^ No MAP, ECT, or TP DTCs have been set.

NOTE: The EVAP solenoid is continuously checked for movement when the engine is running and above conditions have been met P0443 will set if there is an open, short to battery, shorted solenoid coil, or short to ground in the EVAP canister purge solenoid circuit when ignition is On.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem, use the Scan tool to review malfunction history diagnostic information. The supplemental data can be used to duplicate a problem.

Intermittents or opens suspected to be at the connector can be detected by using diagnostic service probe. Voltage can be read on wires without disconnecting any connectors.

If a circuit problem is detected (P0443), a code P0440 will also set.

Check the tightness of the female terminal grip with a spare male terminal.

^ Solenoid resistance = 24-25 ohms.

^ Check 10 amp EGR fuse in Under Hood Junction Block (UHJB).