DTC P0456: Notes
DTC P0456 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0456 |
EVAP control system leak detected (very small leak) |
| DETECTION CONDITION |
- PCM measure the pump load current (EVAP line pressure) when a specified period has passed after EVAP system is sealed when monitoring conditions are met. If the load does not reach the reference load value or rate of the load increase lower than the specified within a specified period, PCM determines that the EVAP system has very small leak.
MONITORING CONDITION
- IG switch OFF
- IAT: 5-35 °C {41-95 °F}
- Battery voltage: 11V or above
- Atmospheric pressure: 72.2 kPa {542 mmHg, 21.33 inHg}
- Fuel tank level: 15-85%
Diagnostic support note
- This is an intermittent monitor (EVAP system monitor).
- 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.
- DIAGNOSTIC MONITORING TEST RESULTS is available.
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| POSSIBLE CAUSE |
- Purge solenoid valve malfunction
- Change over valve (COV) in EVAP system leak detection pump malfunction
- Charcoal canister malfunction
- Fuel cap malfunction
- Fuel tank malfunction
- Poor seal fuel pump unit
- Damaged or loose EVAP hose
- Damaged EVAP pipe
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