P0445

Wiring Diagram:

EVAP Purge Solenoid Control Circuit High Voltage:

P0445- EVAP PURGE SOLENOID CONTROL CIRCUIT HIGH VOLTAGE
The evaporative emission (EVAP) system is used to store fuel vapors as to reduce the amount of unburned fuel from escaping into the atmosphere. The EVAP purge solenoid allows fuel vapor from the EVAP canister to the intake manifold. The ECM controls the solenoid by supplying it ground whenever the EVAP system is in purge mode. Fuel vapors can be purged anytime the ECM is in closed loop and the vehicle is not in a deceleration. When the solenoid is commanded Off (circuit not grounded), the voltage level at the ECM should be high (ignition voltage). When the solenoid is commanded On (circuit grounded), the voltage level at the ECM should be low. The ECM EVAP purge solenoid feedback circuit uses a pull-up voltage (2.6-4~6 volts), which allows the ECM to individual lv differentiate between an open. short to ground or short to voltage. DTC P0445 will set if the ECM detects higher than normal feedback voltage when EVAP purge solenoid is commanded On with engine cranking/running.

DTC PARAMETERS
DTC P0445 will set if EVAP purge solenoid feedback voltage is greater than 4.6 volts when EVAP purge solenoid is commanded On when:
^ Condition exists for longer than 0.5 seconds
^ Engine speed is greater than 40 rpm
^ Battery voltage is between 7.5 and 15.0 volts

DTC P0445 diagnostic runs continuously once the above conditions have been met.

P0445 is a type B DTC

DIAGNOSTIC AIDS
To locate an intermittent problem use Scan tool to command EVAP PURGE SOLENOID On at a 70% duty cycle with ignition On, engine Off. Wiggling wires while listening for the EVAP purge solenoid to stop clicking may locate a shorted solenoid or the area where a short to voltage in the wiring may exist.

EVAP purge solenoid resistance: 16-25 ohms