Toyota RAV4 manuals

Toyota RAV4 Service Manual: Evaporative emission leak detection pump

Toyota RAV4. Evaporative emission leak detection pump


Dtc summary

Toyota RAV4. Evaporative emission leak detection pump


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).

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 to off, the monitor check starts 2.5 Hours later.

Toyota RAV4. Evaporative emission leak detection pump


Toyota RAV4. Evaporative emission leak detection pump


*: 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 leak detection pump


  1. P2401: leak detection pump stuck off 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 is higher than -1.057 Kpa-g (-7.93 Mmhg-g), or lower than -4.85 Kpa-g (-36.4 Mmhg-g), the ecm interprets this as the leak detection pump being stuck off (not operating). The ecm illuminates the mil and sets the dtc (2 trip detection logic).

Toyota RAV4. Evaporative emission leak detection pump


  1. P2402: leak detection pump stuck on in operation b, the leak detection pump creates negative pressure (a vacuum) through the reference orifice. The evap (evaporative emission) system pressure is then measured by the ecm, using the canister pressure sensor, to determine the reference pressure. If the pressure is higher than -1.057 Kpa-g (-7.93 Mmhg-g), or lower than -4.85 Kpa-g (-36.4 Mmhg-g), the ecm interprets this as the leak detection pump being stuck on (remaining on all the time). The ecm illuminates the mil and sets the dtc (2 trip detection logic).

Toyota RAV4. Evaporative emission leak detection pump


Hint:

The detection logic of dtcs p2401 and p2402 is the same because in both cases the reference pressure measured in operation b is compared to the atmospheric pressure registered in operation a.

The ecm calculates the difference between these pressures by deducting [the reference pressure] from [the stored atmospheric pressure], and uses this to monitor the evap system pressure change.

Monitor strategy


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


Monitor result

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

Oxygen (a/f) sensor pumping current circuit
Description Refer to dtc p2195 (see page es-292). Monitor description The air-fuel ratio (a/f) sensor varies its output voltage in proportion to the air-fuel ratio. If the a/f sensor imp ...

Evaporative emission system switching valve control
Dtc summary 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 ...

Other materials:

Repair
Repair valve seats If the seating is too high on the valve face, use 30° and 45° cutters to correct the seat. If the seating is too low on the valve face, use 75° and 45° cutters to correct the seat. Standard width Lap the valve and valve seat by hand with an abrasiv ...

Oxygen (a/f) sensor signal stuck
Hint: Although the dtc titles say oxygen sensor, these dtcs relate to the air-fuel ratio (a/f) sensor. Sensor 1 refers to the sensor mounted in front of the three-way catalytic converter (twc) and located near the engine assembly. Description The a/f sensor generates a voltage* ...

Installation
Hint: Use the same procedures for the lh side and rh side. The procedures listed below are for the lh side. A bolt without a torque specification is shown in the standard bolt chart (see page ss-2). Install rear no. 1 Seat outer belt assembly lh Align the claws with the sea ...

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