DTC P0443


DTC P0443	Evaporative emission control system purge control valve circuit malfunction
DETECTION CONDITION	• The PCM monitors the purge solenoid valve control signal. If the voltage at PCM terminal 2AV remains low or high, the PCM determines that the purge solenoid valve circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. • The PENDING CODE is available if the PCM detects the above malfunction condition. • The FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Purge solenoid valve malfunction • Connector or terminal malfunction • Short to ground between purge solenoid valve terminal B and PCM terminal 2AV • Short to power circuit between purge solenoid valve terminal B and PCM terminal 2AV • Open circuit between purge solenoid valve terminal A and PCM terminal 2T • Open circuit between purge solenoid valve terminal B and PCM terminal 2AV • PCM malfunction


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE.) • Is same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure.
2	CLASSIFY OPEN CIRCUIT OR SHORT TO GROUND MALFUNCTION • Disconnect the purge solenoid valve tube that is connected to the intake manifold. • Connect the vacuum pump to the purge solenoid valve. • Pump the vacuum pump several times and stop. • Wait for a few seconds. • Is a vacuum maintained?	Yes	Go to Step 4.
2		No	Go to the next step.
3	INSPECT PASSAGE CONTROL OF PURGE SOLENOID VALVE • Turn the ignition switch off. • Disconnect the purge solenoid valve connector. • Pump the vacuum pump several times and wait for a few seconds. • Is a vacuum maintained?	Yes	Repair or replace the wiring harness for a short to ground, then go to Step 9.
3		No	Replace the purge solenoid valve, then go to Step 9.
4	INSPECT PURGE SOLENOID VALVE CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 9.
4		No	Go to the next step.
5	INSPECT PURGE SOLENOID VALVE • Perform the purge solenoid valve inspection. (See PURGE SOLENOID VALVE INSPECTION.) • Is the purge solenoid valve normal?	Yes	Go to the next step.
5		No	Replace the purge solenoid valve, then go to Step 9.
6	INSPECT PURGE SOLENOID VALVE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT • Turn the ignition switch to the ON position (Engine off). • Measure voltage between purge solenoid valve connector terminal A (wiring harness-side) and body ground. • Is voltage B+?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness for an open circuit, then go to Step 9.
7	INSPECT PCM CONNECTOR FOR POOR CONNECTION • Turn the ignition switch off. • Disconnect the PCM connector. • Inspect for poor connection (such as damaged, pulled-out pins, and corrosion). • Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 9.
7		No	Go to the next step.
8	INSPECT PURGE SOLENOID VALVE CONTROL CIRCUIT • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between purge solenoid valve terminal B (wiring harness-side) and body ground. • Is the voltage B+?	Yes	Repair or replace the wiring harness for short to power, then go to the next step.
8		No	Inspect for continuity between purge solenoid valve terminal B (wiring harness-side) and PCM terminal 2AV (wiring harness-side). • If there is continuity, go to the next step. • If there is no continuity, repair or replace the wiring harness for an open circuit, then go to the next step.
9	VERIFY TROUBLESHOOTING OF DTC P0443 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Perform the KOER self-test. (See KOEO/KOER SELF-TEST.) • Is same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION.)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE.) • Are any DTCs present?	Yes	Go to applicable DTC troubleshooting. (See DTC TABLE.)
10		No	Troubleshooting completed.