Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: EVAP System Vent Valve Stuck Closed Actuator Stuck Closed (P046673)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / M20a-fxs (engine Control) / Sfi System / EVAP System Vent Valve Stuck Closed Actuator Stuck Closed (P046673)

DTC SUMMARY

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Note

P046673

EVAP System Vent Valve Stuck Closed Actuator Stuck Closed

Following condition is met during key-off EVAP monitor:

  • EVAP pressure change when vent valve on (closed) less than 0.3 kPa [0.04 psi]
  • Canister pump module (reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • Canister (filter inside canister clogged)
  • ECM

Comes on
  • SAE Code: P2422
  • DTC for Mexico Models: Applies

DTC No.

Monitoring Item

Detection Timing

Detection Logic

SAE Code

P046673

Vent valve (built into canister pump module) stuck closed

EVAP monitoring

(ignition switch off)

2 trip

P2422

HINT:

The vent valve is built into the canister pump module.

DESCRIPTION

Refer to EVAP (Evaporative Emission) System.

Click here

MONITOR DESCRIPTION

P046673: Vent valve stuck closed

In operation C, the vent valve turns on (closed) and the EVAP system pressure is then measured by the ECM using the canister pressure sensor to conduct an EVAP leak check. If the pressure does not increase when the vent valve is open, the ECM interprets this as the vent valve being stuck closed. In this case the ECM will illuminate the MIL and store this DTC.

MONITOR STRATEGY

Required Sensors/Components (Main)

Canister pump module

Purge VSV

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

Key-off monitor runs when all of the following conditions are met

-

Atmospheric pressure

70 kPa(abs) [10.2 psi(abs)] or higher, and less than 110 kPa(abs) [16 psi(abs)]

Auxiliary battery voltage

10.5 V or higher

Vehicle speed

Less than 4 km/h (2.5 mph)

Ignition switch

Off

Engine condition

Not running

Key-OFF duration

5, 7 or 9.5 hours

Pressure sensor of canister pump module malfunction (P0451, P0452, P0453)

Not detected

Fuel tank pressure sensor malfunction (P1451, P1452, P1453)

Not detected

Purge VSV

Not operated by scan tool

Vent valve

Not operated by scan tool

Fuel vapor-containment valve

Not operated by scan tool

Leak detection pump

Not operated by scan tool

Purge flow before key-OFF

Performed

Engine coolant temperature

4.4°C (39.9°F) or higher, and less than 35°C (95°F)

Intake air temperature

4.4°C (39.9°F) or higher, and less than 35°C (95°F)

TYPICAL MALFUNCTION THRESHOLDS

EVAP pressure change after EVAP canister vent valve on (closed)

Less than 0.3 kPa [0.04 psi]

MONITOR RESULT

Refer to EVAP system.

Click here

CONFIRMATION DRIVING PATTERN

NOTICE:

  • The Evaporative System Check (Automatic Mode) consists of 9 steps performed automatically by the GTS. It takes a maximum of approximately 40 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 start the engine during this operation.
  • When the temperature of the fuel is 35°C (95°F) or higher, a large amount of vapor will from and any check result will be inaccurate. When performing the Evaporative System Check, keep the fuel temperature less than 35°C (95°F).

HINT:

  • After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

    Click here

  • When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

    Click here

  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. Turn the ignition switch to ON [A].
  7. Turn the GTS on.
  8. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode [B].
  9. After the Evaporative System Check is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
  10. Input the DTC: P046673.
  11. 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 is NORMAL, the system is normal.
    • If the judgment result is ABNORMAL, the system is malfunctioning.
    • [A] to [B]: Normal judgment procedure.

      The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

    • When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.

CAUTION / NOTICE / HINT

NOTICE:

  • Vehicle Control History may be stored in the hybrid vehicle control ECU if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the freeze frame data and Vehicle Control History can be useful for troubleshooting.

    Click here

    (Select Powertrain in Health Check and then check the time stamp data.)

  • If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.

    Click here

HINT:

If the cable is disconnected from the auxiliary battery terminal, the fuel vapor containment valve cannot close completely and an EVAP SYSTEM DTC will be stored. If the DTC is output, drive the vehicle at a speed of 10 km/h (6 mph) or more and then leave the vehicle for 30 seconds or more. Then perform the Evaporative System Check again.

PROCEDURE

1.

GO TO EVAP SYSTEM

Click here

NEXT

END

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