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 the pump load current (EVAP line pressure), while the EVAP leak monitor is operating. When the decrease in the pump load current is less than the specification after the reference current value has been obtained, the PCM determines that the change over-valve (COV) in the 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.
- DTCs are stored in the PCM memory.
|
| POSSIBLE CAUSE |
- Damaged COV (in EVAP system leak detection pump).
- Short to the power circuit between the EVAP system leak detection pump terminal C and PCM terminal 3V
- Damaged PCM
|