Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSMAZDA20066 I, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM L3)DTC P0443NOTES

2006 Mazda 6 i, 4D Sedan, Automatic

DTC P0443: Notes

2006 Mazda 6 i, 4D Sedan, AutomaticSECTION Notes

DTC P0443 DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0443	Purge solenoid valve circuit problem
DETECTION CONDITION	California emission regulation applicable ATX model 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 first drive cycle. FREEZE FRAME DATA is available. The DTC is stored in the PCM memory.
DETECTION CONDITION	Except for California emission regulation applicable ATX model The PCM monitors the input voltages from the purge solenoid valve. If the voltage 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. FREEZE FRAME DATA is available. Are any DTCs 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 2C 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 2C Short to power supply in wiring harness between purge solenoid valve terminal A and PCM terminal 2C PCM malfunction
Courtesy of MAZDA MOTORS CORP.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.