DTC P0456 [L3]: Notes
DTC P0456 (L3) DETECTION CONDITION & POSSIBLE CAUSES
| DTC P0456 |
Evaporative emission 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: 11 V or above
- Atmospheric pressure: 72.3 kPa {542 mmHg, 21.4 inHg} or above
- Fuel level: 15-85%
- Fuel is not refilled from ignition off to next engine start
- Time from engine off: 5 h 10 min
Diagnostic support note
- This is an intermittent monitor (Evaporative system monitor).
- 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.
- DIAGNOSTIC MONITORING TEST RESULT is available.
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| POSSIBLE CAUSE |
- Charcoal canister malfunction
- Fuel filler cap malfunction
- EVAP hose damaged or loose
- EVAP pipe damaged
- Fuel tank malfunction
- Purge solenoid valve malfunction
- EVAP system leak detection pump malfunction
- Fuel pump unit poor seal
- PCM malfunction
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