Ecu 1kz Te Diesel

Total OBD & ECU Auto Diagnostics

Total OBD & ECU Auto Diagnostics

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Platinum Electrode

Sensor Element (Zirconia) Planar Type Air-fuel Ratio Sensor

^ Warm-up Specification 4

Platinum Heater

Platinum Heater

Zirconia Oxygen Sensor

Atmosphere

Sensor Element (Zirconia)

Atmosphere

Sensor Element (Zirconia)

Cup Type Heated Oxygen Sensor

Sensor Type

Planar Type

Cup Type

Warm-up Time

Approx. 10 sec.

Approx. 30 sec.

Mass Air Flow Meter

• The compact and lightweight mass air flow meter, which is a plug-in type, allows a portion of the intake air to flow through the detection area. By directly measuring the mass and the flow rate of the intake air, the detection precision is ensured and the intake air resistance is reduced.

• This mass air flow meter has a built-in intake air temperature sensor.

Temperature Sensing

Temperature Sensing

1kz Ecu Rapear

Knock Sensor (Flat Type) 1) General

In the conventional type knock sensor (resonant type), a vibration plate which has the same resonance point as the knocking frequency of the engine is built in and can detect the vibration in this frequency band.

On the other hand, a flat type knock sensor (non-resonant type) has the ability to detect vibration in a wider frequency band from about 6 kHz to 15 kHz, and has the following features.

• The engine knocking frequency will change a bit depending on the engine speed. The flat type knock sensor can detect the vibration even when the engine knocking frequency is changed. Thus the vibration detection ability is increased compared to the conventional type knock sensor, and a more precise ignition timing control is possible.

---: Conventional Type

Voltage

A

-

^ i

! \ 1

%

/

V__

___

_

--

A: Detection Band of Conventional Type B: Detection Band of Flat Type

Frequency (Hz)

A: Detection Band of Conventional Type B: Detection Band of Flat Type

Frequency (Hz)

Characteristic of Knock Sensor 2i4cem

2) Construction

• The flat type knock sensor is installed on the engine through the stud bolt installed on the cylinder block. For this reason, a hole for the stud bolt is running through the center of the sensor.

• Inside of the sensor, a steel weight is located on the upper portion and a piezoelectric element is located under the weight through the insulator.

• The open/short circuit detection resistor is integrated.

Steel Weight

Insulator

Piezoelectric Element

Open/Short Circuit Detection Resistor

J,

s

Í

h v_

\

%

S

Open/Short Circuit Detection Resistor

Flat Type Knock Sensor (Non-resonant Type)

Piezoelectric Element

Vibration Plate

Piezoelectric Element

Vibration Plate

Conventional Type Knock Sensor (Resonant Type)

214ce02

214ce01

3) Operation

The knocking vibration is transmitted to the steel weight and its inertia applies pressure to the piezoelectric element. The action generates electromotive force.

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4) Open/Short Circuit Detection Resistor

While the ignition is ON, the open/short circuit detection resistor in the knock sensor and the resistor in the ECM keep constant the voltage at the terminal KNK1 of engine.

An IC (Integrated Circuit) in the ECM is always monitoring the voltage of the terminal KNK1. If the open/short circuit occurs between the knock sensor and the ECM, the voltage of the terminal KNK1 will change and the ECM detects the open/short circuit and stores DTC (Diagnostic Trouble Code).

Knock Sensor

Knock Sensor

T200 ki2

Piezoelectric Open/Short Circuit 214CE0

Element Detection Resistor

T200 ki2

)-'

1-Wk-II-wv-

IC

1

)-

X J

Piezoelectric Open/Short Circuit 214CE0

Element Detection Resistor

- Service Tip-

• In accordance with the adoption of an open/short circuit detection resistor, the inspection method for the sensor has been changed. For details, refer to the 2006 RAV4 Repair Manual (Pub. No. RM01M1U).

• To prevent the water accumulation in the connecter, make sure to install the flat type knock sensor in the position as shown in the following illustration.

Rav4 Knock Sensor Location
Knock Sensor

214ce08

251eg12

Throttle Position Sensor

The throttle position sensor is mounted on the throttle body to detect the opening angle of the throttle valve. The throttle position sensor converts the magnetic flux density that changes when the magnetic yoke (located on the same axis as the throttle shaft) rotates around the Hall IC into electric signals to operate the throttle control motor.

Throttle Body

Throttle Body

Throttle Position Sensor Portion

Throttle Control Motor

Throttle Control Motor

Throttle Position Sensor Portion

Magnetic Yoke

Hall IC

Cross Section

Magnetic Yoke

Hall IC

Cross Section

Throttle Position Sensor

Magnetic Yoke

VTA1

VCTA

VTA2

Output Voltage

Output Voltage

10

i | Fully Close Fully Open

Throttle Valve Opening Angle

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230lx12

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Service Tip-\

The inspection method differs from the conventional contact type throttle position sensor because this non-contact type sensor uses a Hall IC.

For details, refer to the 2006 RAV4 Repair Manual (Pub. No. RM01M1U). \_J

Accelerator Pedal Position Sensor

The non-contact type accelerator pedal position sensor uses a Hall IC.

• The magnetic yoke that is mounted at the accelerator pedal arm rotates around the Hall IC in accordance with the amount of effort that is applied to the accelerator pedal. The Hall IC converts the changes in the magnetic flux at that time into electrical signals, and outputs them as accelerator pedal effort to the ECM.

• The Hall IC contains circuits for the main and sub signals. It converts the accelerator pedal depressed angles into electric signals with two differing characteristics and outputs them to the ECM.

Internal Construction

Magnetic Yoke

Internal Construction

Magnetic Yoke

1kz Accelerator Pedal

Accelerator Pedal Arm

Hall IC

Accelerator Pedal Arm

Hall IC

A - A Cross Section

Accelerator Pedal Position Sensor

Magnetic Yoke

VCPA

VPA2 I ECM

EPA2

VCP2

Output Voltage

Output Voltage

Fully Open

Fully Close

Fully Open

Accelerator Pedal Depressed Angle

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Service Tip-

The inspection method differs from the conventional contact type accelerator pedal position sensor because this non-contact type sensor uses a Hall IC.

For details, refer to the 2006 RAV4 Repair Manual (Pab. No. RM01M0U).

6. ETCS-i (Electronic Throttle Control System-intelligent) General

• The ETCS-i is used, providing excellent throttle control in all the operating ranges. In the 2AZ-FE engine, the accelerator cable has been discontinued, and an accelerator pedal position sensor has been provided on the accelerator pedal.

• In the conventional throttle body, the throttle valve opening is determined by the amount of the accelerator pedal effort. In contrast, the ETCS-i uses the ECM to calculate the optimal throttle valve opening that is appropriate for the respective driving condition and uses a throttle control motor to control the opening.

• The ETCS-i controls the IAC (Idle Air Control) system, the TRAC (Traction Control), VSC (Vehicle Stability Control) system and curise control system.

• In case of an abnormal condition, this system switches to the limp mode.

^ System Diagram ^

Throttle Valve

Throttle Valve

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Construction

Throttle Body

Throttle Position Sensor Portion

Throttle Body

Throttle Position Sensor Portion

Sensores Motor Toyota Echo 2003

Throttle Control Motor

Throttle Valve

Cross Section

Throttle Valve

Reduction Gears

View from A

Magnetic Yoke Hall IC

Reduction Gears

Throttle Control Motor

Cross Section

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1) Throttle Position Sensor

The throttle position sensor is mounted on the throttle body, to detect the opening angle of the throttle valve.

2) Throttle Control Motor

A DC motor with excellent response and minimal power consumption is used for the throttle control motor. The ECM performs the duty ratio control of the direction and the amperage of the current that flows to the throttle control motor in order to regulate the opening of the throttle valve.

Operation 1) General

The ECM drives the throttle control motor by determining the target throttle valve opening in accordance with the respective operating condition.

• Non-linear Control

• Idle Air Control

• TRAC Throttle Control

• VSC Coordination Control

• Cruise Control

2) Normal Throttle Control (Non-linear Control)

It controls the throttle to an optimal throttle valve opening that is appropriate for the driving condition such as the amount of the accelerator pedal effort and the engine speed in order to realize excellent throttle control and comfort in all operating ranges.

^ Control Examples During Acceleration and Deceleration ^

: With Control : Without Control

Vehicle's Longitudinal G

Throttle Valve Opening Angle

Accelerator Pedal Depressed Angle

3) Idle Air Control

The ECM controls the throttle valve in order to constantly maintain an ideal idle speed.

4) TRAC Throttle Control

As part of the TRAC system, the throttle valve is closed by a demand signal from the skid control ECU if an excessive amount of slippage is created at a driving wheel, thus facilitating the vehicle in providing excellent stability and driving force.

5) VSC Coordination Control

In order to bring the effectiveness of the VSC system control into full play, the throttle valve opening angle is controlled by effecting a coordination control with the skid control ECU.

6) Cruise Control

An ECM with an integrated cruise control ECU directly actuates the throttle valve for operation of the cruise control.

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Fail-safe of Accelerator Pedal Position Sensor

• The accelerator pedal position sensor is comprised of two (main, sub) sensor circuits. If a malfunction occurs in either one of the sensor circuits, the ECM detects the abnormal signal voltage difference between these two sensor circuits and switches to the limp mode. In the limp mode, the remaining circuit is used to calculate the accelerator pedal depressed angle, in order to operate the vehicle under the limp mode control.

Diagram Accelerator Pedal Action

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• If both circuits have malfunctions, the ECM detects the abnormal signal voltage from these two sensor circuits and stops the throttle control. At this time, the vehicle can be driven within its idling range.

Car Accelerator Pedal Sensor Ecm System

199eg46

Fail-safe of Throttle Position Sensor

• The throttle position sensor is comprised of two (main, sub) sensor circuits. If a malfunction occurs in either one or both of the sensor circuits, the ECM detects the abnormal signal voltage difference between these two sensor circuits, cuts off the current to the throttle control motor, and switches to the limp mode. Then, the force of the return spring causes the throttle valve to return and stay at the prescribed opening angle. At this time, the vehicle can be driven in the limp mode while the engine output is regulated through the control of the fuel injection (intermittent fuel-cut) and ignition timing in accordance with the accelerator opening.

• The same control as above is effected if the ECM detects a malfunction in the throttle control motor system.

Vvti System

Accelerator Pedal Throttle Body

199eg47

7. VVT-i (Variable Valve Timing-intelligent) System General

• The VVT-i system is designed to control the intake camshaft within a range of 40° (of Crankshaft Angle) to provide valve timing that is optimally suited to the engine condition. This realizes proper torque in all the speed ranges as well as realizing excellent fuel economy, and reducing exhaust emissions.

1kz Oil Flow

• Using the engine speed signal, vehicle speed signal, and the signals from mass air flow meter, throttle position sensor and engine coolant temperature sensor, the ECM can calculate optimal valve timing for each driving condition and controls the camshaft timing oil control valve. In addition, the ECM uses signals from the camshaft position sensor and crankshaft position sensor to detect the actual valve timing, thus providing feedback control to achieve the target valve timing.

Effectiveness of the VVT-i System
Vvti System Guaid Book

Construction 1) VVT-i Controller

This controller consists of the housing driven by the timing chain and the vane fixed on the intake camshaft.

The oil pressure sent from the advance or retard side path at the intake camshaft causes rotation in the VVT-i controller vane circumferential direction to vary the intake valve timing continuously. When the engine is stopped, the intake camshaft will be in the most retarded state to ensure startability. When hydraulic pressure is not applied to the VVT-i controller immediately after the engine has been started, the lock pin locks the movement of the VVT-i controller to prevent a knocking noise.

Lock Pin

Lock Pin

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At a Stop In Operation

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Lock Pin

2) Camshaft Timing Oil Control Valve

This camshaft timing oil control valve controls the spool valve position in accordance with the duty-cycle control from the ECM. This allows hydraulic pressure to be applied to the VVT-i controller advance or retard sides. When the engine is stopped, the camshaft timing oil control valve is in the most retarded state.

To VVT-i Controller To VVT-i Controller (Advance Side) (Retard Side)

Spring

Spring

Single Screw Extruder Diagram

Plunger

Drain

Oil Pressure Spool Valve

Plunger

221eg17

Operation 1) Advance

When the camshaft timing oil control valve is operated as illustrated below by the advance signals from the ECM, the resultant oil pressure is applied to the advance side vane chamber to rotate the camshaft in the advance direction.

Advance And Retard Chambers Vvt

2) Retard

When the camshaft timing oil control valve is operated as illustrated below by the retard signals from the ECM, the resultant oil pressure is applied to the retard side vane chamber to rotate the camshaft in the retard direction.

ECM ECM

Rotation Direction

Oil Pressure | j l Drain IN

198eg36

3) Hold

After reaching the target timing, the valve timing is held by keeping the camshaft timing oil control valve in the neutral position unless the traveling state changes.

This adjusts the valve timing at the desired target position and prevents the engine oil from running out when it is unnecessary.

8. Cooling Fan Control

On the models with air conditioning, the ECM controls the operation of the cooling fan in two speeds (Low and High) based on the engine coolant temperature sensor signal and the air conditioning ECU signal. This control is accomplished by operating the 2 fan motors in 2 stages through low speed (series connection) and high speed (parallel connection).

^ Wiring Diagram ^

Wiring Diagram

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Low Speed (Series Connection)

Inverter Welder Schematic

High Speed (Parallel Connection) oinegioy

^ Cooling Fan Operation ^

Air Conditioning Condition

Engine Coolant Temperature °C (°F)

A/C Compressor

Refrigerant Pressure

94 (201.2) or lower

95.5 (203.9) or higher

OFF

1.2 MPa (12.5 kgf/cm2, 178 psi) or lower

OFF

High

ON

1.2 MPa (12.5 kgf/cm2, 178 psi) or lower

Low

High

1.2 MPa (12.5 kgf/cm2, 178 psi) or higher

High

High

9. Fuel Pump Control

A fuel cut control is used to stop the fuel pump when the SRS airbag is deployed at the front collision. In this system, the airbag deployment signal from the airbag sensor is detected by the ECM, which turns OFF the circuit opening relay.

After the fuel cut control has been activated, turning the ignition switch from OFF to ON cancels the fuel cut control, and the engine can be restarted.

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*: Models with SRS Driver, Front Passenger, Side and Curtain Shield Airbags

10. EVAP (evaporative Emission) Control System General

The EVAP (evaporative emission) control system prevents the vapor gas that is created in the fuel tank from being released directly into the atmosphere.

• The canister stores the vapor gas that has been created in the fuel tank.

• The ECM controls the purge VSV in accordance with the driving conditions in order to direct the vapor gas into the engine, where it is burned.

• In this system, the ECM checks the evaporative emission leak and outputs DTC (Diagnostic Trouble Code) in the event of a malfunction. An EVAP (evaporative emission) leak check consists of an application of a vacuum pressure to the system and monitoring the changes in the system pressure in order to detect a leakage.

• This system consists of the purge VSV, canister, refueling valve, canister pump module, and ECM.

• The ORVR (Onboard Refueling Vapor Recovery) function is provided in the refueling valve.

• The canister pressure sensor has been included to the canister pump module.

• The canister filter has been provided on the fresh air line. This canister filter is maintenance-free.

• The followings are the typical conditions for enabling an EVAP leak check:

• Five hours have elapsed after the engine has been turned OFF*.

• Altitude: Below 2400 m (8000 feet)

Typical Enabling

Battery voltage: 10.5 V or more

Condition

• Ignition switch: OFF

• Engine coolant temperature: 4.4 to 35°C (40 to 95°F)

• Intake air temperature: 4.4 to 35°C (40 to 95°F)

*: If engine coolant temperature does not drop below 35°C (95°F), this time should be extended to 7hours.

Even after that, if the temperature is not less than 35 °C (95 °F), the time should be extended to 9.5 hours.

Service Tip-n

• The canister pump module performs the EVAP leak check. This check is done approximately five hours after the engine is turned off. So you may hear sound coming from underneath the luggage compartment for several minutes. It does not indicate a malfunction.

• The pinpoint pressure test procedure is carried out by pressurizing the fresh air line that runs from the pump module to the air filler neck. For details, refer to the 2006 RAV4 Repair Manual (Pub. No. RM01M1U).

System Diagram

To Intake Manifold

Toyota Rav4 Vsv Wiring

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Function of Main Components

Component

Function

Canister

Contains activated charcoal to absorb the vapor gas that is created in the fuel tank.

Refueling

Controls the flow rate of the vapor gas from the fuel tank to the canister when the system is purging or during refueling.

Valve

Restrictor Passage

Prevents a large amount of vacuum during purge operation or system monitoring operation from affecting the pressure in the fuel tank.

Fresh Air Line

Fresh air goes into the canister and the cleaned drain air goes out into the atmosphere.

Vent Valve

Opens and closes the fresh air line in accordance with the signals from the ECM.

Canister Pump Module

Leak Detection Pump

Applies vacuum pressure to the EVAP control system in accordance with the signals from the ECM.

Canister Pressure Sensor

Detects the pressure in the EVAP control system and sends the signals to the ECM.

Purge VSV

Opens in accordance with the signals from the ECM when the system is purging, in order to send the vapor gas that was absorbed by the canister into the intake manifold. In system monitoring mode, this valve controls the introduction of the vacuum into the fuel tank.

Canister Filter

Prevents dust and debris in the fresh air from entering the system.

ECM

Controls the canister pump module and purge VSV in accordance with the signals from various sensors, in order to achieve a purge volume that suits the driving conditions. In addition, the ECM monitors the system for any leakage and outputs a DTC if a malfunction is found.

Construction and Operation

1) Refueling Valve

The refueling valve consists of the chamber A, chamber B, and restrictor passage. A constant atmospheric pressure is applied to the chamber A.

• During refueling, the internal pressure of the fuel tank increases. This pressure causes the refueling valve to lift up, allowing the vapor gas to enter the canister.

• The restrictor passage prevents the large amount of vacuum that is created during purge operation or system monitoring operation from entering the fuel tank, and limits the flow of the vapor gas from the fuel tank to the canister. If a large volume of vapor gas recirculates into the intake manifold, it will affect the air-fuel ratio control of the engine. Therefore, the role of the restrictor passage is to help prevent this from occurring.

Chamber A

Fresh Air Line

Refueling Valve (Open)

Chamber B

From Fuel Tank

Internal Pressure

Chamber A

Fresh Air Line

Refueling Valve (Open)

Chamber B

From Fuel Tank

Chevy Cruze Evap System Diagram

Internal Pressure

Purge Pump Structure Vapor

During Refueling

To Fuel Tank

Positive Pressure (Fuel Tank Pressure)

Negative Pressure Restrictor Passage (Intake Manifold Pressure)

During Purge Operation or System Monitoring Operation

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2) Fuel Inlet (Fresh Air Line)

In accordance with the change of structure of the EVAP control system, the location of a fresh air line inlet has been changed from the air cleaner section to the near fuel inlet. The flesh air from the atmosphere and drain air cleaned by the canister will go in and out of the system through the passage shown below.

Toyota Echo Orvr Valve

3) Canister Pump Module

Canister pump module consists of the vent valve, leak detection pump, and canister pressure sensor.

• The vent valve switches the passages in accordance with the signals received from the ECM.

• A DC type brushless motor is used for the pump motor.

Vent Valve

Canister Pressure Sensor

Fresh Air

Fresh Air

Canister Pressure Sensor

Leak Detection Pump

• Vane Pump

s¿

PT W

r

-II

II

Canister Pressure Sensor

Fresh Air *

Canister

^ Simple Diagram ^

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Canister Pump Module

Fresh Air

Vent Valve

Filter Filter

Leak Detection Pump & Pump Motor

Canister Pressure Sensor

Filter

-trir

Reference Orifice

To Canister d13n17

System Operation

1) Purge Flow Control

When the engine has satisfied the predetermined conditions (closed loop, engine coolant temperature above 74 °C (165 °F), etc.), the stored vapor gas are purged from the canister whenever the purge VSV is opened by the ECM.

The ECM will change the duty ratio cycle of the purge VSV, thus controlling purge flow volume. Purge flow volume is determined by intake manifold pressure and the duty ratio cycle of the purge VSV. Atmospheric pressure is allowed into the canister to ensure that purge flow is constantly maintained whenever purge vacuum is applied to the canister.

To Intake Manifold

To Intake Manifold

2) ORVR (On-board Refueling Vapor Recovery)

When the internal pressure of the fuel tank increases during refueling, this pressure causes the diaphragm in the refueling valve to lift up, allowing the vapor gas to enter the canister. Because the vent valve is always open (even when the engine is stopped) when the system is in a mode other than the monitoring mode, the air that has been cleaned through the canister is discharged outside the vehicle via the fresh air line. If the vehicle is refueled in the monitoring mode, the ECM will recognize the refueling by way of the canister pressure sensor, which detects the sudden pressure increase in the fuel tank, and will open the vent valve.

Open

Orvr Valve

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3) EVAP Leak Check a. General

The EVAP leak check operates in accordance with the following timing chart:

Purge VSV

Vent Valve

Pump Motor

OFF (Vent)

ON OFF

Atmospheric Pressure

System Pressure

0.02 in. Leak Pressure

Atmospheric Pressure

0.02 in. Leak Pressure

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Order

Operation

Description

Time

1)

Atmospheric Pressure Measurement

ECM turns vent valve OFF (vent) and measures EVAP control system pressure to memorize atmospheric pressure.

10 sec.

2)

0.02 in. Leak Pressure Measurement

Leak detection pump creates negative pressure (vacuum) through 0.02 in. orifice and the pressure is measured. ECM determines this as 0.02 in. leak pressure.

60 sec.

3)

EVAP Leak Check

Leak detection pump creates negative pressure (vacuum) in EVAP control system and EVAP control system pressure is measured. If stabilized pressure is larger than 0.02 in. leak pressure, ECM determines EVAP control system has a leakage.

If EVAP control system pressure does not stabilize within 12 minutes, ECM cancels EVAP monitor.

Within 12 min.

4)

Purge VSV Monitor

ECM opens purge VSV and measures EVAP control system pressure increase. If increase is large, ECM interprets this as normal.

10 sec.

5)

Repeat 0.02 in. Leak Pressure Measurement

Leak detection pump creates negative pressure (vacuum) through 0.02 in. orifice and pressure is measured. ECM determines this as 0.02 in. leak pressure.

60 sec.

6)

Final Check

ECM measures atmospheric pressure and records monitor result.

b. Atmospheric Pressure Measurement

1) When the ignition switch is turned OFF, the purge VSV and vent valve are turned OFF. Therefore, the atmospheric pressure is introduced into the canister.

2) The ECM measures the atmospheric pressure through the signals provided by the canister pressure sensor.

3) If the measurement value is out of standards, the ECM actuates the leak detection pump in order to monitor the changes in the pressure.

2006 Avalon Purge Valve

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Purge VSV

Vent Valve

Atmospheric Pressure Measurement

d13n22

c. 0.02 in. Leak Pressure Measurement

1) The vent valve remains OFF, and the ECM introduces atmospheric pressure into the canister and actuates the leak detection pump in order to create a negative pressure.

2) At this time, the pressure will not decrease beyond a 0.02 in. leak pressure due to the atmospheric pressure that enters through a 0.02 in. diameter reference orifice.

3) The ECM compares the logic value with this pressure, and stores it as a 0.02 in. leak pressure in its memory.

4) If the measurement value is below the standard, the ECM will determine that the reference orifice is clogged and store DTC (Diagnostic Trouble Code) P043E in its memory.

5) If the measurement value is above the standard, the ECM will determine that a high flow rate pressure is passing through the reference orifice and store DTCs (Diagnostic Trouble Codes) P043F, P2401 and P2402 in its memory.

Diagnostic Trouble Code Toyota LuxP043f Toyota

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d. EVAP Leak Check

1) While actuating the leak detection pump, the ECM turns ON the vent valve in order to introduce a vacuum into the canister.

2) When the pressure in the system stabilizes, the ECM compares this pressure with the 0.02 in. leak pressure in order to check for a leakage.

3) If the measurement value is below the 0.02 in. leak pressure, the ECM determines that there is no leakage.

4) If the measurement value is above the 0.02 in. leak pressure and near atmospheric pressure, the ECM determines that there is a gross leakage (large hole) and stores DTC P0455 in its memory.

5) If the measurement value is above the 0.02 in. leak pressure, the ECM determines that there is a small leakage and stores DTC P0456 in its memory.

EVAP Leak Check

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Responses

  • fastred
    Where is the ecu of Toyota 1kzte mounted in the vehicle?
    3 years ago
  • Lara
    How does diesel switch for 1kz te electric pump operate?
    3 years ago
  • Meghan
    How can i test coolant temp sensor 97 rav4?
    3 years ago

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