DTC P0456: Notes
DTC P0456 DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0456 |
Evaporative emission control system leak detected (very small leak) |
| DETECTION CONDITION |
- PCM measures the pump load current (EVAP line pressure) when a specified period has passed after the EVAP system is sealed when monitoring conditions are met. If the load does not reach the reference load value or the rate of the load increase is lower than the specification within a specified period, the PCM determines that the EVAP system has a very small leak.
MONITORING CONDITION
- IG switch OFF
- IAT: 5-35°C {40-95°F}
- Battery voltage: 11 V or above
- Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above
- Fuel tank level: 15-85%
- 5 h 10
min elapsed from engine off:
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.
- DTCs are stored in the PCM memory.
- DIAGNOSTIC MONITORING TEST RESULT is available.
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| POSSIBLE CAUSE |
- Purge solenoid valve malfunction
- EVAP system leak detection pump malfunction
- Charcoal canister malfunction
- Fuel cap malfunction
- Fuel tank malfunction
- Fuel pump unit poor seal
- EVAP hose damaged or loose
- EVAP pipe damaged
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