Toyota RAV4 manuals

Toyota RAV4 Service Manual: Evaporative emission system switching valve control

Toyota RAV4 Service Manual / 2Az-fe engine mechanical / Sfi system / Diagnostic trouble code chart / Evaporative emission system switching valve control

Toyota RAV4. Evaporative emission system switching valve control


Dtc summary

Toyota RAV4. Evaporative emission system switching valve control


Hint:

The vent valve is built into the canister pump module.

Description

The description can be found in the evap (evaporative emission) system (see page es-335).

Inspection procedure

Refer to the evap system (see page es-340).

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 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.

Toyota RAV4. Evaporative emission system switching valve control


Toyota RAV4. Evaporative emission system switching valve control


*: If only a small amount of fuel is in the fuel tank, it takes longer for the evap pressure to stabilize.

Toyota RAV4. Evaporative emission system switching valve control


  1. P2419: vent valve stuck closed

In operation b, the leak detection pump creates negative pressure (a vacuum) through the reference orifice. The evap system pressure is then measured by the ecm, using the canister pressure sensor, to determine the reference pressure. If the pressure exceeds -1.057 Kpa-g (-7.93 Mmhg-g) 4 seconds after the leak detection pump is turned on, the ecm interprets this as the vent valve being stuck closed.

The ecm illuminates the mil and sets the dtc (2 trip detection logic).

Toyota RAV4. Evaporative emission system switching valve control


  1. P2420: vent valve stuck open (vent)

In operation c, the vent valve turns on (closes) 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 sets the dtc.

Toyota RAV4. Evaporative emission system switching valve control


Monitor strategy

Toyota RAV4. Monitor strategy


Typical enabling conditions

Toyota RAV4. Typical enabling conditions


Toyota RAV4. Typical enabling conditions


Toyota RAV4. Typical enabling conditions


Typical malfunction thresholds

"Saturated" indicates that the evap pressure change is less than 0.286 Kpa-g (2.14 Mmhg-g) in 60 seconds.

Toyota RAV4. Typical malfunction thresholds


Toyota RAV4. Typical malfunction thresholds


Monitor result

Refer to checking monitor status (see page es-17).

Evaporative emission leak detection pump
Dtc summary Hint: The leak detection pump is built into the canister pump module. Description The description can be found in the evap (evaporative emission) system (see page es-335). I ...

Ecm / pcm internal engine off timer performance
Dtc summary Description To ensure the accuracy of the evap (evaporative emission) monitor values, the soak timer, which is built into the ecm, measures 5 hours (+-15 minutes) from when th ...

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