P0455

2AZ-FXE ENGINE CONTROL: 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.

HINT
Unit expression

- (kPa-a [mmHg-a]) denotes the absolute pressure.
- (kPa-g [mmHg-g]) denotes the gauge pressure (relative pressure).
- On the Techstream, convert the unit of measurement according to the inspection procedure.
MONITOR DESCRIPTION

5 hours*1 after the power switch is turned off, the leak detection pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission) system. The hybrid vehicle control ECU monitors for leaks and actuator malfunctions based on the EVAP pressure.

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





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





- P0455: EVAP (Evaporative Emission) gross leak

- 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 pressure standard x 0.2] (near atmospheric pressure), the hybrid vehicle control ECU determines that the EVAP system has a large leak, illuminates the MIL and sets the DTC (2 trip detection logic).

- P0456: EVAP very small leak

- 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 pressure standard, the hybrid vehicle control ECU determines that the EVAP system has a small leak, illuminates the MIL and sets the DTC (2 trip detection logic).





MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

P0455, P0456





TYPICAL MALFUNCTION THRESHOLDS

P0455: EVAP gross leak





P0456: EVAP 0.02 inch leak





MONITOR RESULT

Refer to Checking Monitor Status Mode 6 Data.

CONFIRMATION DRIVING PATTERN





NOTICE:
- The Evaporative System Check (Automatic Mode) consists of 5 steps performed automatically by the Techstream. It takes a maximum of approximately 18 minutes.
- Do not perform the Evaporative System Check when the fuel tank is more than 90% full because the cut-off valve may be closed, making the fuel tank leak check unavailable.
- Do not run the engine during this operation.
- When the temperature of the fuel is 35°C (95°F) or more, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature below 35°C (95°F).
- Connect the Techstream to the DLC3.

- Turn the power switch on (IG) and turn the Techstream on.

- Clear the DTCs DTC Check / Clear.

- Turn the power switch off and wait for at least 30 seconds.

- Turn the power switch on (IG) and turn the Techstream on.

- Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode [A].

- After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

- Input the DTC: P0455 or P0456.

- Check the DTC judgment result [B].





HINT
If the judgment result shows ABNORMAL, the system has a malfunction.

INSPECTION PROCEDURE

Refer to the EVAP System EVAP System.