Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001GHA4
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 03/2019]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P043E,P043F,P2401,P2402,P2419; Evaporative Emission System Leak Detection Reference Orifice Low Flow; 2020 MY Corolla [01/2019 - 03/2019]

DTC

P043E

Evaporative Emission System Leak Detection Reference Orifice Low Flow

DTC

P043F

Evaporative Emission System Leak Detection Reference Orifice High Flow

DTC

P2401

Evaporative Emission Leak Detection Pump Stuck OFF

DTC

P2402

Evaporative Emission Leak Detection Pump Stuck ON

DTC

P2419

Evaporative Emission Pressure Switching Valve Stuck ON

DTC SUMMARY

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P043E

Evaporative Emission System Leak Detection Reference Orifice Low Flow

Reference orifice clogged during key-off EVAP monitor
  • Canister pump module
  • Connector/wire harness (Canister pump module - ECM)
  • ECM

Comes on

DTC stored

P043F

Evaporative Emission System Leak Detection Reference Orifice High Flow

Reference orifice high-flow during key-off EVAP monitor
  • Canister pump module
  • Connector/wire harness (Canister pump module - ECM)
  • ECM

Comes on

DTC stored

P2401

Evaporative Emission Leak Detection Pump Stuck OFF

Leak detection pump off malfunction during key-off EVAP monitor
  • Canister pump module
  • Connector/wire harness (Canister pump module - ECM)
  • ECM

Comes on

DTC stored

P2402

Evaporative Emission Leak Detection Pump Stuck ON

Leak detection pump on malfunction during key-off EVAP monitor
  • Canister pump module
  • Connector/wire harness (Canister pump module - ECM)
  • ECM

Comes on

DTC stored

P2419

Evaporative Emission Pressure Switching Valve Stuck ON

Vent valve on (closed) malfunction during key-off EVAP monitor
  • Canister pump module
  • Connector/wire harness (Canister pump module - ECM)
  • ECM

Comes on

DTC stored

DTC No.

Monitoring Item

Detection Timing

Detection Logic

P043E

Reference orifice clogged

While ignition switch off

2 trip

P043F

Reference orifice high-flow

P2401

Leak detection pump stuck off

P2402

Leak detection pump stuck on

P2419

Vent valve stuck closed

HINT:

The reference orifice is located inside the canister pump module.

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 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 to 110 kPa(abs) [10.15 to 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

The leak detection pump creates negative pressure through the reference orifice (in operation B and E). When the system is normal, the EVAP pressure is between 97 to 100 kPa(abs) [14.07 to 14.5 psi(abs)]* and saturated within a minute. If not, the ECM interprets this as a malfunction. The ECM illuminates the MIL and stores a DTC if this malfunction is detected in consecutive drive cycles.

*: Typical value.

MONITOR STRATEGY

Required Sensors/Components (Main)

Canister pump module

Required Sensors/Components (Related)

-

Frequency of Operation

Once per driving cycle

Duration

Within 7 minutes

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

"Saturated" indicates that the EVAP pressure change is below 0.286 kPa(gauge) [0.041 psi(gauge)] in 60 seconds.

One of following conditions met

-

EVAP pressure just after reference pressure measurement started

Higher than -0.25 kPa(gauge) [-0.04 psi(gauge)]

Reference pressure

Less than -4.85 kPa(gauge) [-0.703 psi(gauge)]

Reference pressure

-1.057 kPa(gauge) [-0.153 psi(gauge)] or higher

Reference pressure

Not saturated within 360 seconds

Difference between first reference pressure and second reference pressure

0.9 kPa [0.13 psi] or higher

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: P043E, P043F, P2401, P2402 or P2419.
  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 MY Corolla [01/2019 - 03/2019]; 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