DTC P0443 [LF]: Notes

DTC P0443 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

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
Courtesy of MAZDA MOTORS CORP.

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

Courtesy of MAZDA MOTORS CORP.