Toyota Venza manuals

Toyota Venza: Evaporative Emission System Switching Valve Control Circuit High (P2420)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Evaporative Emission System Switching Valve Control Circuit High (P2420)

DTC SUMMARY

DTC No.

Monitoring Item

Malfunction Detection Condition

Trouble Area

Detection Timing

Detection Logic

P2420

Vent valve stuck open (vent)

Following condition met during key-off EVAP monitor:

  • EVAP pressure change when vent valve closed (on) less than 0.3 kPa(gauge) [2.25 mmHg(gauge)]
  • Canister pump module (reference orifice, leak detection pump, vent valve)
  • Connector/wire harness (Canister pump module - ECM)
  • Canister (filter inside canister clogged)
  • ECM

While ignition switch off

2 trip

HINT:

The vent valve is built into the canister pump module.

DESCRIPTION

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


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 below 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 below 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 hours (7 or 9.5 hours) after ignition switch is 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) [525 mmHg(abs) and 825 mmHg(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 then EVAP system pressure is measured. Write down measured value as they 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 there is a leak in EVAP system.

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.

Text in Illustration

*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

P2420: Vent valve stuck open (vent)

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 open. The ECM illuminates the MIL and stores the DTC.


MONITOR STRATEGY

Required Sensors/Components

Purge VSV and canister pump module

Frequency of Operation

Once per driving cycle

Duration

Within 7 minutes (varies with amount of fuel in tank)

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored

None

Atmospheric pressure

70 kPa(abs) [525 mmHg(abs)] or higher, and less than 110 kPa(abs) [825 mmHg(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 (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 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

EVAP pressure change after EVAP canister vent valve on

Less than 0.3 kPa(gauge) [2.25 mmHg(gauge)]

MONITOR RESULT

Refer to Checking Monitor Status (See page
).

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 90% 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 below 35°C (95°F).
  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON and turn the Techstream on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) (See page ).

  4. Turn the ignition switch off and wait for at least 30 seconds.
  5. Turn the ignition switch to ON and turn the Techstream on.
  6. Enter the following menus: Powertrain / Engine / Utility / Evaporative System Check / Automatic Mode.
  7. After the "Evaporative System Check" is completed, check for All Readiness by entering the following menus: Powertrain / Engine / Utility / All Readiness.
  8. Input the DTC: P2420.
  9. 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.
  10. If the test result is INCOMPLETE or N/A and no pending DTC is output, perform a universal trip and check for permanent DTCs (See page ).

    HINT:

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

PROCEDURE

1.

REFER TO THE EVAP SYSTEM

Refer to EVAP System (See page ).



NEXT

END

Oxygen (A/F) Sensor Pumping Current Circuit / Open (Bank 1 Sensor 1) (P2237-P2239,P2252,P2253)
DESCRIPTION Refer to DTC P2195 (See page ). HINT: Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor. DTC No. DTC Detection Conditio ...

ECM / PCM Internal Engine Off Timer Performance (P2610)
DTC SUMMARY DTC No. Monitoring Item Malfunction Detection Condition Trouble Area Detection Timing Detection Logic P2 ...

Other materials about Toyota Venza:

Installation
INSTALLATION PROCEDURE 1. INSTALL SPIRAL WITH SENSOR CABLE SUB-ASSEMBLY (a) Install the spiral with sensor cable sub-assembly (See page ). NOTICE: Do not replace the spiral cable with the battery connected and the engine switch on (IG). ...

Installation
INSTALLATION PROCEDURE 1. INSTALL AIR CONDITIONING UNIT ASSEMBLY (a) Install the air conditioning unit assembly with the 3 nuts. Torque: 9.8 N·m {100 kgf·cm, 87 in·lbf} NOTICE: Tighten the nuts in the order shown in the illustration to install the ...

Interior Light Power Source Circuit
DESCRIPTION The main body ECU (driver side junction block assembly) controls operation of the DOME CUT relay in order to supply power to the interior lights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this ...

© 2016-2019 Copyright www.tovenza.com

0.2281