P0443

DTC P0443

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

DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
P0443 EVAP Purge Solenoid Control Circuit

CONDITIONS FOR RUNNING THE DTC
- DTCs P0458, P0459 are not set.
- The ignition is ON.

CONDITIONS FOR SETTING THE DTC
The control module detects an open circuit on the EVAP purge solenoid valve control circuit with the driver commanded OFF.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the 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 clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

TEST DESCRIPTION

Step 1 - Step 10:

Step 11 - Step 13:

The number below refers to the step number on the diagnostic table.
5. This step tests the control modules ability to supply a ground to the EVAP purge solenoid valve.