DTC P0446: Notes
DTC P0446 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0446 |
Change over valve (COV) (EVAP system leak detection pump) stuck close |
| DETECTION CONDITION |
- The PCM monitors pump load current (EVAP line pressure), while EVAP 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 (COV) in EVAP system leak detection pump has a malfunction.
Diagnostic support note
- This is an intermittent monitor (CCM).
- MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for the same malfunction has been stored in PCM.
- PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.
- FREEZE FRAME DATA is available.
- DTC is stored in the PCM memory.
|
| POSSIBLE CAUSE |
- Damaged COV (in EVAP system leak detection pump).
- Short to power circuit between the EVAP system leak detection pump terminal C and PCM terminal
- Damaged PCM
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