DTC P0456: Notes
DTC P0456 (LF, L3) DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0456 |
Evaporative emission control system leak detected (very small leak) |
| DETECTION CONDITION |
- The 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 {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%
Diagnostic support note
- This is an intermittent monitor (EVAP system).
- The 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 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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