Toyota Yaris: Sfi System / Rough Idling

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Engine & Hybrid System / G16e-gts (engine Control) / Sfi System / Rough Idling

DESCRIPTION

Problem Symptom

Suspected Area

Trouble Area

  • Engine speed fluctuation due to abnormal combustion
  • Idle speed too low or high

Strong engine vibration due to above symptoms

  • Ignition malfunction
  • Deviation in air fuel ratio (Excessive or insufficient intake air volume or fuel supply)
  • Insufficient compression
  • Changes in load from another system

Ignition system

  • Spark plug
  • Ignition coil assembly

Fuel system

  • Direct fuel injector assembly
  • Port fuel injector assembly
  • Fuel pump assembly (for high pressure side)
  • Fuel pump (for low pressure side)
  • Fuel pump control circuit
  • Fuel line
  • Purge VSV system
  • Fuel quality (existence of foreign matter, degradation)

Intake and exhaust systems

  • Mass air flow meter sub-assembly
  • Intake system

    (Air leaks or deposit accumulation)

  • Throttle body with motor assembly
  • Air fuel ratio sensor (sensor 1)
  • Air fuel ratio sensor (sensor 2)
  • Cam timing oil control solenoid assembly
  • Variable Valve Timing system (VVT system)

Other control systems

  • ECM
  • Wire harness or connector
  • Knock control sensor
  • Engine coolant temperature sensor

Engine

  • Water control valve
  • Engine assembly
  • Engine mount

High load from another system

  • Air conditioning system
  • Power steering system
  • Electrical load signal system

SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION

HINT:

The following are descriptions of the characteristics of each system malfunction. After understanding the link between the causes and symptoms, perform the inspection of each component. Even if the problem symptom does not recur, signs of the malfunction may be found in the Data List.

(a) Ignition system

Spark plug

Main cause of malfunction

Performance degradation (wear, existence of foreign matter, etc.)

Symptom

Engine speed fluctuation due to abnormal combustion

Data List

Misfire Count Cylinder #1 to #3

HINT:

If the spark plug of the malfunctioning cylinder is abnormally wet with fuel, a leaking fuel injector assembly is suspected.

Ignition coil assembly

Main cause of malfunction

Internal malfunction

Problem symptom

Engine speed fluctuation due to abnormal combustion

Data List

Misfire Count Cylinder #1 to #3

(b) Fuel system

Fuel injector assembly

Main cause of malfunction

Blockage

Problem symptom

  • Engine speed fluctuation due to abnormal combustion
  • Idle speed too low or high

Data List

  • Target Air-Fuel Ratio
  • Short FT B1S1
  • Long FT B1S1
  • Total FT Bank 1
  • Fuel System Status Bank 1
  • A/F Learn Value Idle Bank 1
  • A/F Learn Value Low Bank 1
  • A/F Learn Value Mid No.1 Bank 1
  • A/F Learn Value Mid No.2 Bank 1
  • A/F Learn Value High Bank 1
  • A/F Learn Value Idle (Port) Bank 1
  • A/F Learn Value Low (Port) Bank 1
  • A/F Learn Value Mid No.1 (Port) Bank 1
  • A/F Learn Value Mid No.2 (Port) Bank 1
  • A/F Learn Value High (Port) Bank 1

HINT:

If the engine malfunction disappears when the fuel injection volume is increased or decreased using the "Control the Injection Volume", the respective cylinder may be malfunctioning.

Fuel system

HINT:

If the air fuel ratio becomes lean only when the engine is running under a high load and at a high engine speed, clogging of the fuel pump or fuel filter is suspected.

Fuel quality

Main cause of malfunction

  • Fuel degradation due to age or water contamination
  • Low fuel quality
  • Addition of fuel additive

Problem symptom

  • Engine speed fluctuation due to abnormal combustion
  • Idle speed too low or high
  • Engine is difficult to start
  • Lack of power

(c) Intake and exhaust systems

Mass air flow meter sub-assembly

Main cause of malfunction

Performance degradation (existence of foreign matter, etc.)

Problem symptom

Lack of power

Data List

Mass Air Flow Sensor

HINT:

If the value of the Data List item "Mass Air Flow Sensor" is abnormal, a malfunction of the mass air flow meter sub-assembly is suspected.

Throttle system

Main cause of malfunction

Inappropriate trim volume adjustment due to accumulation of deposits

Problem symptom

  • Engine speed fluctuation due to abnormal combustion
  • Idle speed too low or high
  • Lack of power

Data List

  • Engine Stall Control F/B Flow
  • ISC F/B Learn Torque
  • ISC Total AUXS Torque
  • ISC F/B Torque
  • Sum of ISC F/B Torque (Recent)
  • ISC AUXS Torque (Alternator)
  • ISC AUXS Torque (Air Conditioner)
  • Throttle Air Flow F/B Value
Air fuel ratio sensor (sensor 1), Air fuel ratio sensor (sensor 2)

Main cause of malfunction

Deviation in sensor characteristics

Problem symptom

Abnormal combustion due to deviation of actual air fuel ratio from calculated ratio

Data List

  • A/F (O2) Sensor Current B1S1
  • A/F (O2) Sensor Current B1S2
  • Fuel System Status Bank 1

(d) Engine

Engine assembly

Main cause of malfunction

  • Compression loss
  • Accumulation of deposits

    (Combustion chamber, intake valve, exhaust valve or intake manifold)

Problem symptom

  • Engine speed fluctuation due to abnormal combustion
  • Idle speed too low or high
  • Hesitation during acceleration or stalling

Data List

  • Compression Leakage Count
  • Rough Idle Status
  • Plural Cylinders Rough Idle
  • Rough Idle Cylinder #1 to #3

HINT:

  • If deposits have accumulated in the combustion chamber or on an intake or exhaust valve, the engine may stall when deposits are caught on an intake or exhaust valve.
  • When performing the Active Test "Check the Cylinder Compression", if the speed of one cylinder is higher than the others, the cylinder may have a compression loss.
  • If deposits accumulate on the intake or exhaust valves, the supply of fuel may be delayed due to adherence of the fuel to the deposits, causing a rough idle.

Data List Items Related to Rough Idling

HINT:

Depending on the vehicle model, the applicable Data List items may vary. Data List items other than the ones used in the diagnostic procedure are for reference only.

  • Mass Air Flow Sensor
  • Engine Stall Control F/B Flow
  • ISC F/B Learn Torque
  • ISC Total AUXS Torque
  • ISC F/B Torque
  • Sum of ISC F/B Torque (Recent)
  • ISC AUXS Torque (Alternator)
  • ISC AUXS Torque (Air Conditioner)
  • Throttle Air Flow F/B Value
  • Target Fuel Pressure (High)
  • Target Fuel Pressure (Low) / Target Fuel Pressure 2
  • Fuel Pressure (High)
  • Fuel Pressure (Low) / Fuel Pressure 2
  • High Pressure Fuel Pump Duty Ratio (D4)
  • High Pressure Fuel Pump2 Duty Ratio (D4)
  • High Pressure Fuel Pump Discharge Rate
  • High Pressure Fuel Pump2 Discharge Rate
  • Target Air-Fuel Ratio
  • A/F (O2) Sensor Current B1S1
  • A/F (O2) Sensor Current B1S2
  • Short FT B1S1
  • Long FT B1S1
  • Total FT Bank 1
  • Fuel System Status Bank 1
  • A/F Learn Value Idle Bank 1
  • A/F Learn Value Low Bank 1
  • A/F Learn Value Mid No.1 Bank 1
  • A/F Learn Value Mid No.2 Bank 1
  • A/F Learn Value High Bank 1
  • A/F Learn Value Idle (Port) Bank 1
  • A/F Learn Value Low (Port) Bank 1
  • A/F Learn Value Mid No.1 (Port) Bank 1
  • A/F Learn Value Mid No.2 (Port) Bank 1
  • A/F Learn Value High (Port) Bank 1
  • Misfire Count Cylinder #1 to #3
  • Compression Leakage Count
  • Rough Idle Status
  • Plural Cylinders Rough Idle
  • Rough Idle Cylinder #1 to #3

Vehicle Control History Freeze Frame Data Items Related to Rough Idling

HINT:

The frequency of the malfunction can be determined by confirming the number of times the symptom occurred.

  • Rough Idle Count (Plural Cylinders)
  • Rough Idle Count (Compression Leakage)
  • Rough Idle Count (Low Frequency)
  • Rough Idle Count #1 to #3

CAUTION / NOTICE / HINT

HINT:

  • If any other DTCs are output, perform troubleshooting for those DTCs first.
  • Make sure to reproduce the conditions present when the malfunction occurred.
  • Using the GTS, read the Data List to confirm the engine operating conditions. This information can be useful when troubleshooting.
  • The vehicle condition when the problem symptoms occurred can be determined using the Vehicle Control History.
  • As the Vehicle Control History data may be overwritten whenever the trigger conditions are met, make sure to save the Vehicle Control History data before performing any inspections.
  • If the problem symptoms do not recur, attempt to reproduce the symptoms and conditions when the malfunction occurred based on the result of the customer problem analysis and Vehicle Control History. Place the priority on confirming the symptoms.
  • When performing inspections, jiggle the relevant wire harnesses and connectors in an attempt to reproduce malfunctions that do not always occur.
  • The suspected cause of the problem symptoms can be determined using the codes, items, and Freeze Frame Data within the Vehicle Control History.
  • When confirming the Freeze Frame Data, be sure to check all multi Freeze Frame Data.
  • When confirming the Freeze Frame Data, if there are multiple items related to the cause of the malfunction, perform troubleshooting for all related items.
  • If the malfunction is currently occurring, use the Data List to confirm the current vehicle condition. By using the Data List, more detailed vehicle information can be confirmed than by using Vehicle Control History Freeze Frame Data by itself.
  • As Vehicle Control History may be stored when performing an Active Test, learning, etc., make sure to clear the Vehicle Control History before returning the vehicle to the customer.

PROCEDURE

1.

INTERVIEW THE CUSTOMER

(a) Interview the customer for details about the conditions when the rough idle occurred.

HINT:

Depending on the conditions when the rough idle occurred, a malfunction in one of the following areas is suspected.

Problem Symptom

Suspected Area

Hesitation or lack of power occurs during acceleration, regardless of whether engine is cold or warm

  • For low mileage vehicles (ODO reading of less than approximately 20000 km (12428 mile) or yearly mileage of less than 2000 km (1243 mile)): Fuel quality (degradation, water contamination, etc.)
  • For high mileage vehicles (ODO reading of more than approximately 150000 km (93210 mile)): Excessively lean air fuel ratio during acceleration due to deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve or adherence of fuel to the deposits
  • Abnormal mass air flow meter sub-assembly output due to existence of foreign matter
  • Decrease in fuel injector assembly injection volume due to low quality fuel

Engine stalls or is difficult to start immediately after engine stalled, regardless of whether engine is cold or warm

Deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve

  • When decelerating vehicle to a stop, engine speed drops momentarily and vehicle shudders
  • When moving shift lever, or operating air conditioning system or any electrical components, engine speed fluctuates and vehicle shudders

Temporary deviation in the electrical throttle system idle speed control due to external factors (fuel quality, air conditioning system (environmental causes or low refrigerant pressure) or charging system (auxiliary battery deterioration or low power generation by the generator assembly))

NEXT

2.

CHECK DTC OUTPUT

(a) Read the DTCs.

Powertrain > Engine > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTC is output

B

B

GO TO DTC CHART

A

3.

READ VALUE USING GTS (ISC F/B LEARN TORQUE)

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

ISC F/B Learn Torque

(b) Read the value displayed on the GTS.

Result

Proceed to

Less than 15 Nm

A

Other than above

B

B

GO TO STEP 19

A

4.

READ VALUE USING GTS (SHORT FT AND LONG FT)

(a) Enter the following menus.

Powertrain > Engine > Data List

Tester Display

Short FT B1S1

Long FT B1S1

(b) Read the value displayed on the GTS.

Data List

Result

Proceed to

Short FT B1S1 + Long FT B1S1

-20% or higher, or less than 20%

A

Short FT B1S1 + Long FT B1S1

Other than above

B

HINT:

  • "Total FT Bank 1" is used to detect an abnormal air fuel ratio. As the value of "Total FT Bank 1" is corrected by the ECM before it is displayed in the Data List, the displayed value may not be equal to the sum of the measured "Short FT B1S1" and "Long FT B1S1".
  • An abnormally lean or rich tendency can be checked by reading the following Data List items: A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1, A/F Learn Value High Bank 1, A/F Learn Value Idle (Port) Bank 1, A/F Learn Value Low (Port) Bank 1, A/F Learn Value Mid No.1 (Port) Bank 1, A/F Learn Value Mid No.2 (Port) Bank 1 and A/F Learn Value High (Port) Bank 1.
  • The following may cause a lean air fuel ratio (an operating range in which the air fuel ratio learned value correction is +20% or more):
    1. Decrease in fuel injector assembly injection volume
    2. Decrease in mass air flow meter sub-assembly output (due to existence of foreign matter)
    3. Air leaks in intake system after mass air flow meter sub-assembly
    4. Decrease in fuel pressure (at fuel filter, fuel pump, fuel main valve assembly or fuel suction plate sub-assembly)
  • On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value High Bank 1" or "A/F Learn Value High (Port) Bank 1" only is corrected to the positive side, a malfunction in the fuel system (clogging of the fuel pump or fuel filter) is suspected.
  • On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value Idle Bank 1", "A/F Learn Value Low Bank 1", "A/F Learn Value Idle (Port) Bank 1" or "A/F Learn Value Low (Port) Bank 1" only is corrected to the positive side, an air leak after the mass air flow meter sub-assembly is suspected.
  • The following may cause a rich air fuel ratio (an operating range in which the air fuel ratio learned value correction is -20% or less):
    1. Increase in the fuel injector assembly injection volume
    2. Purge VSV system
B

GO TO STEP 12

A

5.

PERFORM ACTIVE TEST USING GTS (D-4S (FUEL CUT))

(a) Start the engine.

HINT:

Reproduce the vehicle conditions when the malfunction occurred. (such as after the engine is warmed up or after a cold start).

(b) Enter the following menus.

Powertrain > Engine > Active Test

Active Test Display

D-4S (Fuel Cut)

Data List Display

Engine Speed

Injection Mode

(c) According to the display on the GTS, perform the Active Test and check for a malfunctioning cylinder.

HINT:

  • Perform fuel-cut of port injection and direct injection for each cylinder and check the change in the engine speed.
  • If the engine speed of a cylinder does not change while performing the Active Test, it can be determined that the cylinder is malfunctioning.
  • If the engine speed of all cylinders change while performing the Active Test, it can be determined that multiple cylinders are malfunctioning.
  • A cylinder for which the Data List item "Misfire Count Cylinder #1 to #3" increases may be malfunctioning.
  • If "Compression Leakage Count" in the Data List increases, misfiring due to insufficient compression may be occurring.

Result

Proceed to

One cylinder is malfunctioning

A

Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined.

B

B

GO TO STEP 12

A

6.

PERFORM ACTIVE TEST USING GTS (CHECK THE CYLINDER COMPRESSION)

HINT:

If the vehicle does not support the Active Test "Check the Cylinder Compression", measure the compression pressure. If the compression pressure is normal, go to step 8 (PERFORM ACTIVE TEST USING GTS (D-4S (INJECTION VOLUME))).

(a) Warm up the engine.

(b) Enter the following menus.

Powertrain > Engine > Active Test

Active Test Display

Check the Cylinder Compression

Data List Display

Engine Speed Cylinder #1

Engine Speed Cylinder #2

Engine Speed Cylinder #3

Average Engine Speed of All Cylinder

HINT:

To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.

(c) Push the snapshot button to turn the snapshot function on.

HINT:

Using the snapshot function, data can be recorded during the Active Test.

(d) While the engine is not running, press the Active button to change Check the Cylinder Compression to "Start".

HINT:

After performing the above procedure, Check the Cylinder Compression will start. Fuel injection for all cylinders is prohibited and each cylinder engine speed measurement enters standby mode.

(e) Crank the engine for about 10 seconds.

(f) Monitor the engine speed (Engine Speed Cylinder #1 to #3 and Average Engine Speed of All Cylinder) displayed on the GTS.

NOTICE:

  • Do not crank the engine continuously for 20 seconds or more.
  • If it is necessary to crank the engine again after Check the Cylinder Compression has been changed to "Start" and the engine has been cranked once, press Exit to return to the Active Test menu screen. Then change Check the Cylinder Compression to "Start" and crank the engine.
  • Make sure the auxiliary battery is fully charged before performing this Active Test.

(g) Stop cranking the engine, and then change "Check the Cylinder Compression" to "Stop" after the engine stops.

NOTICE:

  • If the Active Test is changed to "Stop" while the engine is being cranked, the engine will start.
  • When performing the Active Test, Vehicle Control History code X0810 (Engine Difficult to Start (Engine Starting Time Long)) may be stored.
  • After performing the Active Test, make sure to check and clear DTCs.

(h) Push the snapshot button to turn the snapshot function off.

(i) Select "Stored Data" on the GTS screen, select the recorded data and display the data as a graph.

HINT:

If the data is not displayed as a graph, the change of the values cannot be observed.

(j) Read the value.

HINT:

  • At first, the GTS will display extremely high cylinder engine speed values. After approximately 10 seconds of engine cranking, the engine speed measurement of each cylinder will change to the actual engine speed.
  • If the value of Data List item "Engine Speed Cylinder" of a cylinder is higher than other cylinders, the cylinder may be malfunctioning.
  • If the value of Data List item "Engine Speed Cylinder" is high for only one cylinder, compression loss is suspected.

Result

Proceed to

There is no variation in "Engine Speed Cylinder"

(All cylinders display approximately the same value for "Engine Speed Cylinder")

A

There is variation in "Engine Speed Cylinder"

(Only one cylinder displays a value for "Engine Speed Cylinder" that differs considerably)

B

B

GO TO STEP 11

A

7.

PERFORM ACTIVE TEST USING GTS (D-4S (INJECTION VOLUME))

(a) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

(b) Idle the engine.

(c) Enter the following menus.

Powertrain > Engine > Active Test

Active Test Display

D-4S (Injection Volume)

Data List Display

Injection Mode

(d) According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume of port injection and direct injection.

HINT:

  • Increase and decrease the fuel injection volume of the port injection and direct injection simultaneously and check the vehicle condition.
  • Change the fuel injection volume between the minimum and maximum range of correction (e.g. -12.5% to 24.8%).

Result

Proceed to

Malfunction is still present even if the fuel injection volume is changed

A

Malfunction disappears when the fuel injection volume is changed

B

B

GO TO STEP 10

A

8.

CHECK IGNITION SYSTEM

(a) Check the ignition system.

HINT:

  • Interchange the ignition coil assembly and spark plug of the malfunctioning cylinder with those of a known good cylinder and check if the malfunctioning cylinder returns to normal.
  • If the spark plug of the malfunctioning cylinder is abnormally wet with fuel even after the ignition coil assembly and spark plug are replaced, a leaking fuel injector assembly is suspected.

Result

Proceed to

The malfunctioning cylinder does not return to normal

A

The malfunctioning cylinder returned to normal

B

B

GO TO STEP 18

A

9.

INSPECT OTHER RELATED COMPONENTS

(a) Check the power source circuit, wire harness and connectors.

NEXT

GO TO STEP 18

10.

REPLACE FUEL INJECTOR ASSEMBLY

(a) Replace the abnormal fuel injector assembly.

HINT:

  • If the air fuel ratio learned value is corrected to the positive side for all operating ranges due to low fuel injector assembly injection volume, replace the fuel injector assemblies of all cylinders.
  • Perform "Inspection After Repair" after replacing the fuel injector assembly.

    Click here

NEXT

GO TO STEP 21

11.

CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure. If the compression pressure of a cylinder is low, inspect the engine assembly and repair or replace parts as necessary.

Click here

NEXT

GO TO STEP 18

12.

INSPECT MASS AIR FLOW METER SUB-ASSEMBLY

Click here

NG

GO TO STEP 17

OK

13.

PERFORM ACTIVE TEST USING GTS (D-4S (INJECTION VOLUME))

(a) Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.

(b) Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.

(c) Idle the engine.

(d) Enter the following menus.

Powertrain > Engine > Active Test

Active Test Display

D-4S (Injection Volume)

Data List Display

Injection Mode

A/F (O2) Sensor Current B1S1

A/F (O2) Sensor Current B1S2

(e) According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume of port injection and direct injection.

NOTICE:

  • The air fuel ratio sensor (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.
  • Read the output current immediately after warming up the air fuel ratio sensors to avoid an inaccurate reading due to a sensor cooling.

HINT:

  • Increase and decrease the fuel injection volume of the port injection and direct injection simultaneously and check the vehicle condition.
  • Change the fuel injection volume between -12 to 12%.

Standard:

GTS Display

(Sensor)

Injection Volume

Current

A/F (O2) Sensor Current B1S1

(Air fuel ratio (sensor 1))

12%

Below -0.075 mA

-12%

More than 0.037 mA

A/F (O2) Sensor Current B1S2

(Air fuel ratio (sensor 2))

12%

Below -0.86 mA

-12%

More than 0.33 mA

Result

Proceed to

Output current values are abnormal

A

Malfunction disappears when fuel injection volume is increased

B

Malfunction is still present when fuel injection volume is increased, even if output current values are normal

C

B

GO TO STEP 15

C

GO TO STEP 16

A

14.

REPLACE AIR FUEL RATIO SENSOR (SENSOR 1) AND AIR FUEL RATIO SENSOR (SENSOR 2)

(a) Replace the air fuel ratio sensor (sensor 1).

Click here

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

Click here

(b) Replace the air fuel ratio sensor (sensor 2).

Click here

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

Click here

NEXT

GO TO STEP 21

15.

REPLACE FUEL INJECTOR ASSEMBLY

(a) Replace the fuel injector assemblies of all cylinders.

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Click here

NEXT

GO TO STEP 21

16.

INSPECT OTHER RELATED COMPONENTS

(a) Inspect other related components.

HINT:

If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.

  • Engine mount deterioration
  • Deposits in the intake manifold or on an intake valve
  • Delay in fuel supply due to adherence of the fuel to the deposits
NEXT

GO TO STEP 18

17.

CHECK INTAKE SYSTEM

(a) Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.

HINT:

  • If there is foreign matter in the intake system components, remove it before proceeding to the next step.
  • If there is no foreign matter in the intake system components, check for foreign matter in the mass air flow meter sub-assembly. If there is foreign matter in the mass air flow meter sub-assembly, remove it.
NEXT

18.

REPAIR OR REPLACE MALFUNCTIONING PARTS

(a) Repair or replace the malfunctioning part.

HINT:

Perform "Inspection After Repair" after repairing or replacing the malfunctioning part.

Click here

NEXT

GO TO STEP 21

19.

REMOVE FOREIGN OBJECT (CLEAN THROTTLE BODY WITH MOTOR ASSEMBLY)

(a) Clean off any deposits from the inside of the throttle body with motor assembly.

(b) Push open the throttle valve and wipe off any carbon from the valve and bore using a piece of cloth soaked in non-residue solvent.

*1

Throttle Body with Motor Assembly

*2

Bore

*3

Valve

-

-

*a

Reference

*b

Throttle Body with Motor Assembly Cross-section Diagram

*c

When valve fully opened

*d

Do not directly apply cleaner

*e

Deposits

-

-

NOTICE:

  • Make sure that the cloth or your fingers do not get caught in the valve.
  • Make sure that foreign matter does not enter the throttle valve.
  • Do not directly apply non-residue solvent to the throttle body with motor assembly or wash the throttle body with motor assembly. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.
  • If there is coating material on the edge of the valve, be careful not to remove it.

HINT:

  • The illustrations are for reference only. Actual parts may differ.
  • When cleaning or replacing one throttle body with motor assembly, clean the other throttle body with motor assembly.
NEXT

20.

PERFORM CONFIRMATION DRIVING PATTERN

(a) Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.

Click here

(b) Start the engine and warm it up until the engine coolant temperature reaches is 75°C (167°F) or higher.

(c) Allow the engine to idle for 3 minutes or more and confirm that the engine speed is within the specified range.

HINT:

After cleaning the deposits from the throttle body with motor assembly, perform learning value reset and idle learning. If the engine is operated without performing learning again, the engine speed may increase.

NEXT

21.

CONDUCT CONFIRMATION TEST

(a) Check that the idle has returned to normal.

NEXT

END

    Ignition Circuit

    DESCRIPTION A direct ignition system is used on this vehicle. The direct ignition system is a 1 cylinder ignition system which ignites one cylinder with one ignition coil...

    Engine Difficult to Start

    DESCRIPTION Problem Symptom Suspected Area Trouble Area Engine does not crank Engine cranks slowly Auxiliary battery depletion Starter malfunction Starter system Auxiliary battery depletion Starter malfunction Starter circuit Excessive engine friction Engine Engine assembly Starting time is long Engine speed fluctuation due to abnormal combustion Idle speed too low or high The engine stalls immediately after starting Strong engine vibration due to above symptoms Ignition malfunction Deviation in air fuel ratio (Excessive or insufficient intake air volume or fuel supply) Insufficient compression Changes in load from another system Ignition system Spark plug Ignition coil assembly Fuel system Direct fuel injector assembly Port fuel injector assembly Fuel pump assembly (for high pressure side) Fuel pump (for low pressure side) Fuel pump control circuit Fuel suction plate sub-assembly Fuel main valve assembly Fuel line Purge VSV system Fuel quality (existence of foreign matter, degradation) Intake and exhaust systems Mass air flow meter sub-assembly Intake system (Air leaks or deposit accumulation) Throttle body with motor assembly Air fuel ratio sensor (sensor 1) Air fuel ratio sensor (sensor 2) Cam timing oil control solenoid assembly Variable Valve Timing system (VVT system) Other control systems ECM Wire harness or connector Knock control sensor Engine coolant temperature sensor Immobiliser system Engine Water control valve Engine assembly Crankshaft position sensor High load from another system Air conditioning system Power steering system Electrical load signal system SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION HINT: The following are descriptions of the characteristics of each system malfunction...

    Other information:

    Toyota Yaris XP210 (2020-2022) Reapir and Service Manual: Power Steering Torque Sensor "A" Signal Compare Failure (C151162,C151187,C151262,C151287)


    DESCRIPTION The power steering ECU assembly supplies a voltage of 5 V to the torque sensor (electric power steering column sub-assembly) and monitors the voltage value of the Hall IC inside the torque sensor (electric power steering column sub-assembly) which changes in response to changes in the magnetic flux density (steering torque) detected by the Hall IC, and calculates the assist torque...

    Toyota Yaris XP210 (2020-2022) Reapir and Service Manual: Removal


    REMOVAL CAUTION / NOTICE / HINT HINT: When the cable is disconnected / reconnected to the auxiliary battery terminal, systems temporarily stop operating. However, each system has a function that completes learning the first time the system is used. Learning completes when vehicle is driven Effect/Inoperative Function When Necessary Procedures are not Performed Necessary Procedures Link Lane tracing assist system Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 second or more...

    Categories

    Liftgate/Trunk Lid

    WARNING

    Never allow a person to ride in the luggage compartment/trunk

    Allowing a person to ride in the luggage compartment/trunk is dangerous. The person in the luggage compartment/trunk could be seriously injured or killed during sudden braking or a collision.

    Do not drive with the liftgate/trunk lid open

    read more

     
    Copyright © 2022 www.toyaris4.com