DTC P0443 [LF, L3]


DTC P0443	Evaporative emission control system purge control valve circuit malfunction
DETECTION CONDITION	• The PCM monitors the input voltages from the purge solenoid valve. If the voltage at PCM terminal 4U 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. • 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 in wiring harness between purge solenoid valve terminal A and PCM terminal 4U • Open circuit in wiring harness between main relay and purge solenoid valve terminal B • Open circuit in wiring harness between purge solenoid valve terminal A and PCM terminal 4U • Short to power circuit between purge solenoid valve terminal A and PCM terminal 4U • PCM malfunction


STEP	INSPECTION		ACTION
1	PERFORM DTC CONFIRMATION PROCEDURE • Perform the DTC CONFIRMATION PROCEDURE. (See DTC CONFIRMATION PROCEDURE [LF, L3].) • Is the same DTC present?	Yes	Go to the next step.
1		No	Intermittent concern exists. Go to the INTERMITTENT CONCERN TROUBLESHOOTING procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [LF, L3].)
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 a few seconds. • Is 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 to the OFF position. • Disconnect the purge solenoid valve connector. • Pump the vacuum pump several times and wait a few seconds. • Is vacuum maintained?	Yes	Repair or replace the wiring harness for a short to ground, then go to Step 9.
3		No	Replace purge solenoid valve, then go to Step 9.
4	INSPECT PURGE SOLENOID VALVE CONNECTOR FOR POOR CONNECTION • Turn the ignition switch to the OFF position. • Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.). • Is there 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 [LF, L3]) • Is the purge solenoid valve normal?	Yes	Go to the next step.
5		No	Replace purge solenoid valve, then go to Step 9.
6	INSPECT PURGE SOLENOID VALVE POWER SUPPLY CIRCUIT for an open circuit CIRCUIT • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between purge solenoid valve connector terminal B and body ground. • Is the 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 to the OFF position. • Disconnect the PCM connector. • Inspect for poor connection (damaged/pulled-out pins, corrosion, etc.). • Is there 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 A (harness-side) and body ground. • Is the voltage B+?	Yes	Repair or replace the wiring harness for a short to power, then go to the next step.
8		No	Inspect for continuity between purge solenoid valve terminal A (harness-side) and PCM terminal 4U (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. • Perform the KOER self-test. (See KOEO/KOER SELF-TEST [LF, L3].) • Is the same DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [LF, L3].)
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [LF, L3].) • Are any DTCs present?	Yes	Go to the applicable DTC troubleshooting. (See DTC TABLE [LF, L3].)
10		No	Troubleshooting completed.