DTC P0443

DTC P0443	Purge solenoid valve circuit problem
DETECTION CONDITION	The PCM monitors the purge solenoid valve control signal voltage and current. If the following conditions are met, the PCM determines that there is the purge solenoid valve control circuit problem. The PCM turns the purge solenoid valve off, but the voltage of the purge solenoid valve control signal remains low. The PCM turns the purge solenoid valve on, but the current of the purge solenoid valve control signal remains high. 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 during the first drive cycle. FREEZE FRAME DATA (Mode 2/Mode 12) is available. The DTC is stored in the PCM memory.
POSSIBLE CAUSE	Purge solenoid valve connector or terminals malfunction Open circuit or short to ground in purge solenoid valve power supply circuit Short to ground in wiring harness between main relay and purge solenoid valve terminal B Purge solenoid valve power supply circuit related fuse malfunction Open circuit in wiring harness between main relay and purge solenoid valve terminal B Short to ground in wiring harness between purge solenoid valve terminal A and PCM terminal 2C PCM connector or terminals malfunction Short to power supply in wiring harness between purge solenoid valve terminal A and PCM terminal 2C Purge solenoid valve malfunction Open circuit in wiring harness between purge solenoid valve terminal A and PCM terminal 2C PCM malfunction

DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED Has the FREEZE FRAME DATA (Mode 12) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2	VERIFY RELATED SERVICE BULLETINS AVAILABILITY Verify related Service Bulletins availability. Is any related Service Bulletins available?	Yes	Perform the repair or diagnosis according to the available Service Bulletins. If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	INSPECT PURGE SOLENOID VALVE CONNECTOR AND TERMINALS Turn the ignition switch off. Disconnect the purge solenoid valve connector. Inspect for poor connection (such as damaged/pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 10.
3		No	Go to the next step.
4	INSPECT PURGE SOLENOID VALVE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND Purge solenoid valve connector is disconnected. 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	Go to the next step.
4		No	Inspect the purge solenoid valve power supply circuit related fuse. If the fuse is melt: Repair or replace the wiring harness for a possible short to ground. Replace the fuse. If the fuse is deterioration: Replace the fuse. If the fuse is normal: Repair or replace the wiring harness for a possible open circuit. Go to Step 10.
5	INSPECT PURGE SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO GROUND Purge solenoid valve connector is disconnected. Turn the ignition switch off. Inspect for continuity between purge solenoid valve terminal A (wiring harness-side) and body ground. Is there continuity?	Yes	If the short to ground circuit could be detected: Repair or replace the wiring harness for a possible short to ground. If the short to ground circuit could not be detected: Replace the PCM (short to ground in PCM internal circuit). (See PCM REMOVAL/INSTALLATION ). Go to Step 10.
5		No	Go to the next step.
6	INSPECT PCM CONNECTOR AND TERMINALS 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 connector or terminals, then go to Step 10.
6		No	Go to the next step.
7	INSPECT PURGE SOLENOID VALVE CONTROL CIRCUIT FOR SHORT TO POWER SUPPLY Purge solenoid valve and PCM connectors are disconnected. Turn the ignition switch to the ON position (Engine off). Measure the voltage between purge solenoid valve terminal A (wiring harness-side) and body ground. Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 10.
7		No	Go to the next step.
8	INSPECT PURGE SOLENOID VALVE Turn the ignition switch off. Inspect the purge solenoid valve. (See PURGE SOLENOID VALVE INSPECTION ). Is there any malfunction?	Yes	Replace the purge solenoid valve, then go to Step 10. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION ).
8		No	Go to the next step.
9	INSPECT PURGE SOLENOID VALVE CONTROL CIRCUIT FOR OPEN CIRCUIT Purge solenoid valve and PCM connectors are disconnected. Turn the ignition switch off. Inspect for continuity between purge solenoid valve terminal A (wiring harness-side) and PCM terminal 2C (wiring harness-side). Is there continuity?	Yes	Go to the next step.
9		No	Repair or replace the wiring harness for a possible open circuit, then go to the next step.
10	VERIFY TROUBLESHOOTING OF DTC P0443 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the M-MDS. Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST ). Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION ).
10		No	Go to the next step.
11	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ). Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE ).
11		No	DTC troubleshooting completed.