P0443

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DTC P0443 Evaporative Emission (EVAP) Control System Purge Control Valve Circuit Malfunction




Circuit Description
The Powertrain Control Module (PCM) controls the Evaporative Emission (EVAP) Canister Purge Solenoid Valve through the use of a control (ground) circuit. If the PCM commands the Purge solenoid to maximum duty cycle (100 %) but the voltage remains High (12 Volts); or, if the PCM commands the Purge solenoid to minimum duty cycle (0 %) but the voltage remains Low (0 volts), then DTC P0443 will set. DTC P0443 is a type A code.

Conditions for Setting the DTC
- Ignition voltage is greater than 10 volts
- Engine run time is greater than 32 seconds

The above mentioned conditions are met and one of the following two conditions are met for 25 seconds within a 50 seconds test sample:
- PCM senses voltage is High with the EVAP Canister Purge Solenoid commanded ON.
- PCM senses voltage is Low with the EVAP Canister Purge Solenoid commanded OFF.

Action Taken When the DTC Sets
- The PCM will illuminate the Malfunction Indicator Lamp (MIL) the first time the fault is detected.
- The PCM will store the conditions that were present when the DTC was set as Freeze Frame and in Failure Records.

Conditions for Clearing the MIL/DTC
- The PCM will turn OFF the MIL after three consecutive trips without a reported failure.
- A History DTC will clear after 40 consecutive trips without a reported failure.
- The DTC can be cleared using the Scan Tool's "Clear Info" function.

Diagnostic Aids
- Poor connections ,or a damaged harness - Inspect the harness connectors for: backed-out terminals, improper mating or damaged terminals. Also check for open circuits, shorts to ground, and shorts to voltage.
- The Fuel Pressure Sensor shares a 5 Volt reference with the MAP sensor and TP sensor.

If these codes are also set, it could indicate a problem with the 5 Volt reference circuit or components itself.

- The Fuel Pressure Sensor share a ground with the MAP sensor and the TP sensor.