Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001HTOF
Model Year Start: 2020 Model: Corolla Prod Date Range: [03/2019 - 11/2022]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: P0443; Evaporative Emission Control System Purge Control Valve Circuit; 2020 - 2023 MY Corolla [03/2019 - 11/2022]

DTC

P0443

Evaporative Emission Control System Purge Control Valve Circuit

DESCRIPTION

HINT:

This DTC P0443 is applicable to models for Mexico only.

To reduce hydrocarbon (HC) emissions, evaporated fuel from the fuel tank is routed through a charcoal canister to the intake manifold for combustion in the cylinders.

The ECM changes the duty signals to the purge VSV (Vacuum Switching Valve for Purge Control) so that the intake amount of hydrocarbon (HC) emissions is appropriate for the driving conditions (engine load, engine speed, vehicle speed, etc.) after the engine is warmed up.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

Note

P0443

Evaporative Emission Control System Purge Control Valve Circuit

Both of the following conditions (a) and (b) are met (1 trip detection logic)

(a) The target control value and actual control value do not match for 10 seconds or more.

(b) The target control value and actual control value do not much for 80 times or more.
  • Open or short in purge VSV circuit
  • Purge VSV
  • ECM

Comes on

DTC stored

DTC for Mexico Models

- Applies

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the GTS 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. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [A].

    HINT:

    The A/C switch and all accessory switches should be off.

  7. Turn the GTS on.
  8. Idle the engine for 15 minutes or more [B].

    HINT:

    Check the EVAP (Purge) VSV item in the Data List. When the value of this item is between 5 and 95%, the judgment will be performed.

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [C].
  10. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  12. Input the DTC: P0443.
  13. Check the DTC judgment result.

    GTS 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.
    • If the judgment result shows INCOMPLETE or N/A, perform steps [D] through [E].
  14. Drive the vehicle at a constant speed between 40 and 60 km/h (25 and 37 mph) for 10 minutes or more [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

  15. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [E].
  16. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  17. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  18. Input the DTC: P0443.
  19. Check the DTC judgment result.

    GTS 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.
    • If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

1.

PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE VSV FOR EVAP CONTROL)

(a) Disconnect the fuel vapor feed hose (charcoal canister side) of the purge VSV.

*1

Purge VSV

*2

Fuel Vapor Feed Hose (to Canister)

(b) Connect the GTS to the DLC3.

(c) Start the engine.

(d) Turn the GTS on.

(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for Evap Control.

Powertrain > Engine and ECT > Active Test

Tester Display

Activate the VSV for Evap Control

(f) When the purge VSV is operated using the GTS, check whether the port of the purge VSV applies suction your finger.

OK:

GTS Operation

Specified Condition

ON

Purge VSV port applies suction to finger

OFF

Purge VSV port applies no suction to finger

HINT:

Jiggle the wire harness and connector to increase the likelihood of detecting malfunctions that do not always occur.

OK

CHECK FOR INTERMITTENT PROBLEMS

NG

2.

INSPECT PURGE VSV

(a) Inspect the purge VSV.

Click here 2020 - 2023 MY Corolla [03/2019 - 11/2022]; 2ZR-FAE (EMISSION CONTROL): PURGE VALVE (w/o Canister Pump Module): INSPECTION

NG

REPLACE PURGE VSV

OK

3.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)

(a) Disconnect the purge VSV connector.

*a

Front view of wire harness connector

(to Purge VSV)

(b) Turn the ignition switch to ON.

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C29-2 - Body ground

Ignition switch ON

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN RELAY - PURGE VSV)
OK

4.

CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM)

(a) Disconnect the purge VSV connector.

(b) Disconnect the ECM connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

C29-1 - C77-33 (PRG)

Always

Below 1 Ω

C29-1 or C77-33 (PRG) - Body ground and other terminals

Always

10 kΩ or higher
OK

REPLACE ECM 2020 - 2022 MY Corolla [03/2019 - 09/2022]; 2ZR-FAE (ENGINE CONTROL): ECM: REMOVAL 2023 MY Corolla [09/2022 - 11/2022]; 2ZR-FAE (ENGINE CONTROL): ECM: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR