DTC P0446: Notes
DTC P0446 DETECTION & CONDITION POSSIBLE CAUSES
| DTC P0446 |
EVAP system vent control circuit problem |
| DETECTION CONDITION |
- The PCM monitors pump load current (EVAP line pressure) when the evaporative leak monitor is operating. If the decrease in pump load current is less than the specification after the reference current value has been obtained, the PCM determines that the change over valve in the EVAP system leak detection pump has a malfunction.
Diagnostic support note
- This is an intermittent monitor (EVAP system).
- 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 is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Change over valve malfunction (in EVAP system leak detection pump).
- Connector or terminal malfunction
- Short to power supply in wiring harness between the EVAP system leak detection pump terminal C and PCM terminal 4H
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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