Circuit Description

Ignition voltage is supplied directly to EVAP purge solenoid valve. PCM controls valve by grounding control circuit via an internal driver. Primary function of driver is to supply ground for component being controlled. Each driver has a fault line which is monitored by PCM. When PCM is commanding a component on, voltage of control circuit should be low (near zero volt). When PCM is commanding control circuit to component off, voltage should be high (near battery voltage). If fault detection circuit senses a voltage other than what is expected, this DTC will set.

PCM will monitor EVAP purge valve circuit for short to ground, short to voltage, open circuit, open component or an internally shorted or excessively low resistance on EVAP purge valve circuit. When PCM detects any of these malfunctions, this DTC will set and affected driver will be disabled. PCM will continue to test circuit and if fault disappears, driver will be reactivated.

This DTC will set when there is short to ground, open, or short to battery voltage detected on control circuit and the condition is present for at least 30 seconds.