31 EVAP Solenoid Circuit - (P 0443)

31 EVAP SOLENOID CIRCUIT - (P 0443)





The evaporative purge solenoid is mounted on the passenger side of the engine compartment. It is operated as a Powertrain Control Module (PCM) output, with pin 16 providing a switched ground path once the vehicle enters closed loop operation. The PCM operates the ground control side of the evaporative purge solenoid at a duty cycle (ON and OFF several times a second). With the solenoid energized, vapors are allowed to be purged from the canister.

ENABLING CONDITIONS
- Battery voltage must be at least 10 volts
- Ignition voltage must be supplied to the PCM

The MIL illuminates and a Diagnostic Trouble Code (DTC) is stored any time the PCM requests that the solenoid be activated and the voltage at pin 16 of the PCM is high, or when the PCM request that the solenoid be de-energized and the voltage at pin 16 is low. For either condition, the malfunction must be maintained for at least three seconds for the MIL to illuminate and a DTC to be stored.

This malfunction could possibly be caused by problems with any of the following components:

- Duty Cycle Purge (DCP) solenoid (open or shorted)
- DCP solenoid wiring or related connectors (open or short) PCM