Toyota Yaris: Sfi System / Evaporative Emission System Purge Control Valve "A" Circuit Open (P044313)

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Evaporative Emission System Purge Control Valve "A" Circuit Open (P044313)

DESCRIPTION

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

Note

P044313

Evaporative Emission System Purge Control Valve "A" Circuit Open

Both of the following conditions (a) and (b) are met for 10 seconds or more (1 trip detection logic):

(a) The purge VSV operation duty signal is 5 to 95%.

(b) The target control value and actual control value do not match.

  • Open or short in purge VSV circuit
  • Purge VSV
  • EFI-MAIN NO. 3 relay
  • ECM

Comes on

SAE: P0443

CONFIRMATION DRIVING PATTERN

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the GTS on.
  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. 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.

  8. Enter the following menus: Powertrain / Engine / Trouble Codes [C].
  9. 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.
  10. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  11. Input the DTC: P044313.
  12. 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

    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, perform steps [D] and [E].
  13. 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.

  14. Enter the following menus: Powertrain / Engine / Trouble Codes [E].
  15. 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.
  16. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
  17. Input the DTC: P044313.
  18. 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

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses of 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 GTS (ACTIVATE THE EVAP PURGE VSV)

*a

VSV is on

*b

VSV is off

(a) Disconnect the fuel vapor feed hose (on the canister side) from the purge VSV.

(b) Start the engine.

(c) Enter the following menus.

Powertrain > Engine > Active Test

Tester Display

Activate the EVAP Purge VSV

(d) When the purge VSV is operated using the GTS, check whether the port of the purge VSV applies suction to 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

Click here

NG

REPLACE PURGE VSV

OK

3.

CHECK TERMINAL VOLTAGE (POWER SOURCE OF PURGE VSV)

(a) Disconnect the purge VSV connector.

(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

D96-1(+B) - Body ground

Ignition switch ON

11 to 14 V

*a

Front view of wire harness connector

(to Purge VSV)

NG

GO TO STEP 5

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

D96-2(EVP1) - D104-45(PRG)

Always

Below 1 Ω

D96-2(EVP1) or D104-45(PRG) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPLACE ECM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT EFI-MAIN NO. 3 RELAY

Click here

NG

REPLACE EFI-MAIN NO. 3 RELAY

OK

6.

CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block assembly.

*1

No. 1 Engine Room Relay Block Assembly

*2

EFI-MAIN NO. 3 Relay

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

3 (EFI-MAIN NO. 3 relay) - Body ground

Always

11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 3 RELAY)

OK

7.

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND)

(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1 (EFI-MAIN NO. 3 relay) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.

CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - PURGE VSV)

(a) Remove the EFI-MAIN NO. 1 relay, EFI-MAIN NO. 3 relay and EDU relay from the No. 1 engine room relay block assembly.

HINT:

Remove the EFI-MAIN NO. 1 relay and EDU relay connected between the checked terminals as the coil inside the relay influences the measurement value.

(b) Disconnect the purge VSV connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

5(EFI-MAIN NO. 3 relay) - D96-1(+B)

Always

Below 1 Ω

5(EFI-MAIN NO. 3 relay) or D96-1(+B) - Body ground and other terminals

Always

10 kΩ or higher

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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