Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HT3O
Model Year Start: 2020 Model: Corolla Prod Date Range: [03/2019 - 11/2022]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0455,P0456; Evaporative Emission Control System Leak Detected (Gross Leak); 2020 - 2023 MY Corolla [03/2019 - 11/2022]

DTC

P0455

Evaporative Emission Control System Leak Detected (Gross Leak)

DTC

P0456

Evaporative Emission Control System Leak Detected (Very Small Leak)

DTC SUMMARY

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P0455

Evaporative Emission Control System Leak Detected (Gross Leak)

Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at start and end of leak check.

If stabilized pressure is higher than [second reference pressure x 0.2], ECM determines that EVAP system has a large leak.

  • Fuel cap (loose)
  • Leakage from EVAP line (canister - fuel tank)
  • Leakage from EVAP line (purge VSV - canister)
  • Leakage from canister pump module
  • Leakage from fuel tank
  • Leakage from canister

Comes on

DTC stored

DTC for Mexico Models

- Does not apply

P0456

Evaporative Emission Control System Leak Detected (Very Small Leak)

Leak detection pump creates negative pressure (vacuum) in EVAP system and EVAP system pressure is measured. Reference pressure is measured at start and end of leak check.

If stabilized pressure is higher than second reference pressure, ECM determines that EVAP system has a small leak.

  • Fuel cap (loose)
  • Leakage from EVAP line (canister - fuel tank)
  • Leakage from EVAP line (purge VSV - canister)
  • Leakage from canister pump module
  • Leakage from fuel tank
  • Leakage from canister

Comes on

DTC stored

DTC for Mexico Models

- Does not apply

DTC No.

Monitoring Item

Detection Timing

Detection Logic

P0455

EVAP gross leak

While ignition switch off

2 trip

P0456

EVAP small leak

While ignition switch off

2 trip

DESCRIPTION

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

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: EVAP System+

MONITOR DESCRIPTION

5 hours* after the ignition switch is turned off, the 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 less than 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 less than 35°C (95°F) 7 hours after the ignition switch is turned off, the monitor check starts 2.5 hours later.

Sequence

Operation

Description

Duration

-

ECM activation

Activated by soak timer 5, 7 or 9.5 hours after ignition switch turned off.

-

A

Atmospheric pressure measurement

Vent valve is turned off (vent) and EVAP system pressure is measured by ECM in order to register atmospheric pressure.

If pressure in EVAP system is not between 70 kPa(abs) and 110 kPa(abs) [10.15 psi(abs) and 15.95 psi(abs)], ECM cancels EVAP system monitor.

60 seconds

B

First reference pressure measurement

In order to determine reference pressure, leak detection pump creates negative pressure (vacuum) through reference orifice and then ECM checks if leak detection pump and vent valve operate normally.

360 seconds

C

EVAP system pressure measurement

Vent valve is turned on (closed) to shut EVAP system.

Negative pressure (vacuum) is created in EVAP system, and EVAP system pressure is then measured.

Write down measured value as it will be used in leak check. If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.

15 minutes*

D

Purge VSV monitor

Purge VSV is opened and then EVAP system pressure is measured by ECM.

Large increase indicates normal.

10 seconds

E

Second reference pressure measurement

After second reference pressure measurement, leak check is performed by comparing first and second reference pressure measurements.

If stabilized system pressure is higher than second reference pressure, ECM determines that EVAP system is leaking.

60 seconds

-

Final check

Atmospheric pressure is measured and then monitoring result is recorded by ECM.

-

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

*1

Purge VSV: Off (Closed)

*2

Purge VSV: On (Open)

*3

Vent Valve: Off (Vent)

*4

Vent Valve: On (Closed)

*5

Leak Detection Pump: Off

*6

Leak Detection Pump: On

*7

Reference Orifice (0.02 inch)

*8

Canister Pressure Sensor

*9

Canister

*10

Fuel Tank

*11

Canister Pump Module

*12

Canister Filter

*a

Operation A:

Atmospheric Pressure Measurement

*b

Operation B, E:

Reference Pressure Measurement

*c

Operation C:

EVAP System Pressure Measurement

*d

Operation D:

Purge VSV Monitor

*e

Atmospheric Pressure

*f

Negative Pressure

  • (a) 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 reference pressure x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large leak, illuminates the MIL and stores the DTC (2 trip detection logic).

  • (b) 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 reference pressure, the ECM determines that the EVAP system has a small leak, illuminates the MIL and stores the DTC (2 trip detection logic).

MONITOR STRATEGY

Required Sensors/Components (Main)

Purge VSV

Canister pump module

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

Within 20 minutes (varies with amount of fuel in tank)

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Atmospheric pressure

70 kPa(abs) [10.15 psi(abs)] or higher, and less than 110 kPa(abs) [15.95 psi(abs)]

Battery voltage

10.5 V or higher

Vehicle speed

Less than 4 km/h (2.5 mph)

Ignition switch

Off

Time after key-off

5, 7 or 9.5 hours

Canister pressure sensor malfunction (P0451, P0452, P0453)

Not detected

Purge VSV

Not operated by scan tool

Vent valve

Not operated by scan tool

Leak detection pump

Not operated by scan tool

Both of the following conditions met before-key off

Conditions 1 and 2

1. Duration that vehicle is driven

5 minutes or more

2. EVAP purge operation

Performed

Engine coolant temperature

4.4°C (40°F) or higher, and less than 35°C (95°F)

Intake air temperature

4.4°C (40°F) or higher, and less than 35°C (95°F)

TYPICAL MALFUNCTION THRESHOLDS

P0455

EVAP pressure when vacuum introduction is complete

Higher than [reference pressure x 0.2]

P0456

EVAP pressure when vacuum introduction is complete

Between reference pressure and [reference pressure x 0.2]

MONITOR RESULT

Refer to EVAP System.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: EVAP System+

CONFIRMATION DRIVING PATTERN

NOTICE:

  • The Evaporative System Check (Automatic Mode) consists of 6 steps performed automatically by the Techstream. It takes a maximum of approximately 24 minutes.
  • Do not perform the Evaporative System Check when the fuel tank is more than 85% 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 higher, a large amount of vapor forms and any check results become inaccurate. When performing the Evaporative System Check, keep the fuel temperature less than 35°C (95°F).
  • The Evaporative System Check can be performed only once in one trip.

    If an Evaporative System Check needs to be performed again, turn the ignition switch off and wait for 5 minutes or more before performing another check.

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the ignition switch off and wait for at least 30 seconds.
  6. Turn the ignition switch to ON.
  7. Turn the Techstream on.
  8. Enter the following menus: Powertrain / Engine and ECT / Utility / Evaporative System Check / Automatic Mode.
  9. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  10. Input the DTC: P0455 or P0456.
  11. Check the DTC judgment result.

    Techstream Display

    Description

    NORMAL

    • DTC judgment completed
    • System normal

    ABNORMAL

    • DTC judgment completed
    • System abnormal

    INCOMPLETE

    • DTC judgment not completed
    • Perform driving pattern after confirming DTC enabling conditions

    N/A

    • Unable to perform DTC judgment
    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
  12. If the judgment result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs.

    Click here 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: DTC CHECK / CLEAR

    HINT:

    • If a permanent DTC is output, the system is malfunctioning.
    • If no permanent DTC is output, the system is normal.

PROCEDURE

1.

GO TO EVAP SYSTEM

(a) Refer to EVAP System.

Click here 2020 - 2023 MY Corolla [01/2019 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: EVAP System

NEXT

END