DTC P0446 [L3]: Notes

WARNING: This page is about a different car, the 2008 Mazda 5. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0446 [L3] DETECTION CONDITIONS AND POSSIBLE CAUSES

DTC P0446	Change over valve EVAP system leak detection pump stuck close
DETECTION CONDITION	The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating. When the decrease in pump load current is less than the specification after the reference current value has been obtained, the PCM determines change over valve in EVAP system leak detection pump has a malfunction. Diagnostic support note This is an intermittent monitor (CCM). 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 is available. DTC is stored in the PCM memory.
POSSIBLE CAUSE	Damaged EVAP system leak detection pump. Short to power circuit between the EVAP system leak detection pump terminal C and PCM terminal 1L Damaged PCM

DTC P0446

Change over valve EVAP system leak detection pump stuck close

DETECTION CONDITION

The PCM monitors pump load current (EVAP line pressure), while evaporative leak monitor is operating.
When the decrease in pump load current is less than the specification after the reference current value has been obtained, the PCM determines change over valve in EVAP system leak detection pump has a malfunction.

Diagnostic support note

This is an intermittent monitor (CCM).
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 is available.
DTC is stored in the PCM memory.

POSSIBLE CAUSE

Damaged EVAP system leak detection pump.
Short to power circuit between the EVAP system leak detection pump terminal C and PCM terminal 1L
Damaged PCM