DTC P0456: Notes

DTC P0456 [L3] CHART

DTC P0456	Evaporative emission 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: 11 V or above Atmospheric pressure: 72.2 kPa {542 mmHg, 21.3 inHg} or above Fuel tank level: 15-85% Time from engine off: 5h 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.
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

DTC P0456

Evaporative emission 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

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.

POSSIBLE CAUSE