P0455

2TR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0455,P0456: Evaporative Emission Control System Leak Detected (Gross Leak)


DTC SUMMARY





DESCRIPTION

The circuit description can be found in the EVAP (Evaporative Emission) System EVAP System.

INSPECTION PROCEDURE

Refer to the EVAP System EVAP System.

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned to OFF, the electric leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions based on the EVAP pressure.

HINT
*: If the engine coolant temperature is not below 35°C (95°F) 5 hours after the ignition switch is turned off, the monitor check starts 2 hours later. If it is still not below 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.





* If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.





1. P0455: EVAP (Evaporative Emission) gross leak

1. In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak criterion x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leakage, illuminates the MIL and sets the DTC (2 trip detection logic).

2. P0456: EVAP very small leak

2. In operation C, the leak detection pump creates negative pressure (vacuum) in the EVAP system and the EVAP system pressure is measured. If the stabilized system pressure is higher than second 0.02 inch leak criterion, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets the DTC (2 trip detection logic).





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0455 (pattern A), P0456:





P0455 (pattern B):





TYPICAL MALFUNCTION THRESHOLDS









MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data or EVAP System.