Toyota RAV4 manuals

Toyota RAV4 Service Manual: Evaporative emission system reference orifice

Toyota RAV4. Evaporative emission system reference orifice


Dtc summary

Toyota RAV4. Evaporative emission system reference orifice


Hint:

The reference orifice is located inside 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. Monitor description


Toyota RAV4. Monitor description


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

Toyota RAV4. Monitor description


  1. P043e: reference orifice clogged

In operation b, the leak detection pump creates negative pressure (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 lower than -4.85 Kpa-g (-36.4 Mmhg-g), the ecm interprets this as a clog malfunction in the reference orifice, and stops the evap system monitor.

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

Toyota RAV4. Monitor description


  1. P043f: reference orifice high-flow

In operation b, the leak detection pump creates negative pressure (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), the ecm interprets this as a high-flow malfunction in the reference orifice, and stops the evap system monitor. The ecm then illuminates the mil and sets the dtc (2 trip detection logic).

Toyota RAV4. Monitor description


Monitor strategy

Toyota RAV4. 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).

Catalyst system efficiency below threshold (bank 1)
Monitor description The ecm uses sensors mounted in front of and behind the three-way catalytic converter (twc) to monitor its efficiency. The first sensor, the air-fuel ratio (a/f) sensor, ...

Evaporative emission control system incorrect purge flow
Dtc summary 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). Monito ...

Other materials:

Input signal circuit abnormal
Description This dtc expresses the internal abnormalities of the ecm. Inspection procedure Check for dtc Clear the dtc (see page cc-15). Check for dtc (see page cc-15). Ok: dtc is not output. End ...

Data list / active test
Read data list Hint: Using the intelligent tester's data list allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the data list early in troubleshooting is one way to save time. Connect the intelligent tester (with can vim) to the dlc3 ...

Check for open circuit
For an open circuit in the wire harness in fig. 1, Check the resistance or voltage, as described below. Check the resistance. Disconnect connectors a and c, and measure the resistance between them. Standard resistance (fig. 2) Hint: Measure the resistance while lightly s ...

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