P0445

CIRCUIT DESCRIPTION
An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge valve. The EVAP canister purge valve is pulse width modulated (PWM). The scan tool displays the amount of ON time as a percentage. The control module monitors the status of the driver. The control module controls the EVAP canister purge valve ON time by grounding the control circuit via an internal switch called a driver. If the control module detects voltage on the control circuit when the driver is commanded ON, this DTC sets.

CONDITIONS FOR RUNNING THE DTC
- The engine speed is more than 400 RPM.
- The system voltage is between 8-18 volts.

CONDITIONS FOR SETTING THE DTC
- The control module detects voltage on the control circuit when the driver is commanded ON.
- The fault is present for 50 seconds, cumulative during the drive cycle.

ACTION TAKEN WHEN THE DTC SETS
- The control module will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test ran and failed.
- The control module will store conditions which were present when the DTC set as Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC will clear after 40 consecutive warm-up cycles without a malfunction.
- Clear the MIL and the DTC with a scan tool.

TEST DESCRIPTION

Steps 1-4:

Steps 5-11:

The number below refers to the step number on the diagnostic table.
2. This step tests if the concern is active. The EVAP purge valve is pulse width modulated (PWM). An audible clicking should be heard when the purge valve is commanded to 50 percent and should stop when the EVAP purge valve is commanded to 0 percent. The rate at which the valve cycles should increase as the commanded state is increased and decrease as the commanded state is decreased. Repeat the commands as necessary.