SFI SYSTEM(w/ Canister Pump Module) 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


  • Spark plug

  • Ignition coil assembly

Ignition system

  • Fuel injector assembly

  • Fuel pump

  • Fuel pump control circuit

  • Fuel line

  • Purge VSV system

  • Fuel quality (existence of foreign matter, degradation)

Fuel system

  • EGR system

  • Mass air flow meter sub-assembly

  • Intake system

    (Air leaks or deposit accumulation)

  • Throttle body assembly

  • Air fuel ratio sensor

  • Heated oxygen sensor

  • Camshaft timing oil control valve assembly

  • Variable Valve Timing system (VVT system)

Intake and exhaust systems

  • ECM

  • Wire harness or connector

  • Knock control sensor

  • Engine coolant temperature sensor

Other control systems

  • Thermostat

  • Engine assembly

  • Engine mount

Engine

Tech Tips


  • If any DTCs are output, perform troubleshooting for the DTCs first.

  • Try 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.

  • 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. Place the priority on confirming the symptoms.


  1. SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION

    Tech Tips

    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.


    1. 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 #4

      Tech Tips

      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 #4
    2. 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
      • Short FT B1S1

      • Long FT B1S1

      • Total FT Bank 1

      • Fuel System Status Bank 1

      • Target Air-Fuel Ratio

      • A/F (O2) Lambda Sensor B1S1

      • 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

      Tech Tips

      If the engine malfunction disappears when the fuel injection volume is increased or decreased by performing the Active Test "Control the Injection Volume" or "Control the Injection Volume for A/F Sensor", the respective cylinder may be malfunctioning.

      Fuel system

      Tech Tips

      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

    3. Intake and exhaust systems

      EGR system
      Main cause of malfunction EGR valve movement problems or stuck
      Problem symptom
      • Engine speed fluctuation due to abnormal combustion

      • Idle speed too low or high

      • Startability malfunction, lack of power or engine stalls

      Data List
      • Target EGR Valve Position No.1


        • Normally, Actual EGR Position = Target EGR Valve Position No. 1 +/-5% (fully closed: 0%, fully open: 100%)

        • When the power switch is turned on (IG), the EGR valve fully closes.

      • Clogged EGR Port Imbalance

      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

      Tech Tips

      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

      Data List
      • Engine Stall Control F/B Flow

      • ISC Learning Value

      Air fuel ratio sensor, Heated oxygen sensor
      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 Voltage B1S1

      • O2 Sensor Voltage B1S2

      • Fuel System Status Bank 1

    4. Engine

      Engine assembly
      Main cause of malfunction
      • Compression loss

      • Accumulation of deposits

        (Combustion chamber, intake valve or intake manifold)

      Problem symptom
      • Engine speed fluctuation due to abnormal combustion

      • Idle speed too low or high

      • Hesitation during acceleration or stalling

      Tech Tips


      • If deposits have accumulated in the combustion chamber or on an intake valve, the engine may stall when deposits are caught on an intake 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 compression loss.

      • If deposits accumulate on the intake valves, the supply of fuel may be delayed due to adherence of the fuel to the deposits, causing a rough idle.

  2. DATA LIST ITEMS RELATED TO ROUGH IDLING

    Tech Tips

    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

    • Target Air-Fuel Ratio

    • A/F (O2) Lambda Sensor B1S1

    • A/F (O2) Sensor Voltage B1S1

    • O2 Sensor Voltage B1S2

    • Short FT Bank 1

    • Long FT Bank 1

    • Total FT Bank 1

    • Fuel System Status Bank 1

    • Target EGR Valve Position No.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

    • Misfire Count Cylinder #1 to #4

    • ISC Learning Value

PROCEDURE


  1. INTERVIEW THE CUSTOMER


    1. Interview the customer for details about the conditions when the rough idle occurred.

      Tech Tips

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

      Problem Symptom Suspected Area
      Engine runs rough, particularly when idling after a coil start. Engine runs less rough when the engine speed is increased Possibly caused by excessive EGR due to insufficient closing of the EGR valve
      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 miles) or yearly mileage of less than 2000 km (1243 miles)): Fuel quality (degradation, water contamination, etc.)

      • For high mileage vehicles (ODO reading of more than approximately 150000 km (93210 miles)): 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
      Result
      Proceed to
      NEXT

    NEXT
  2. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Perform a road test.

    5. Enter the following menus: Powertrain / Engine / Trouble Codes.

    6. Read the DTCs.


      Powertrain > Engine > Trouble Codes
      Result
      Result Proceed to
      DTCs are not output A

      DTCs is output

      (DTC other than P160400 or P160500 is output)

      B

    B
    A
  3. SYMPTOM CONFIRMATION


    1. Check if the problem symptoms reported in the customer problem analysis recur.

      Tech Tips

      If the problem symptoms do not recur, attempt to reproduce the conditions when the malfunction occurred based on the result of the customer problem analysis.

      Result
      Result Proceed to
      The problem symptom recurs A
      The problem symptom does not recur (occurred in the past) B

    B
    A
  4. READ VALUE USING GTS (ISC LEARNING VALUE)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / ISC Learning Value.


      Powertrain > Engine > Data List
      Tester Display
      ISC Learning Value
    5. According to the display on the GTS, read the Data List.

      Result
      Result Proceed to
      Less than 10 Nm A
      Other than above B

    B
    A
  5. READ VALUE USING GTS (SHORT FT B1S1 AND LONG FT B1S1)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine / Data List / Short FT B1S1 and Long FT B1S1.


      Powertrain > Engine > Data List
      Tester Display
      Short FT B1S1
      Long FT B1S1
    5. According to the display on the GTS, read the Data List.

      Result
      Data List Result Proceed to
      Short FT B1S1 + Long FT B1S1 -20% or higher, or less than 20% A
      Other than above B

      Tech Tips


      • "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 and A/F Learn Value High Bank 1. (For vehicles equipped with a V type engine, check that both banks have the same correction tendency. If the correction of either bank is -20% or less or +20% or more, the air fuel ratio sensor or heated oxygen sensor of that bank may be malfunctioning.)

      • 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 or fuel pressure regulator 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" 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" or "A/F Learn Value Low 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
    A
  6. PERFORM ACTIVE TEST USING GTS (CONTROL THE SELECT CYLINDER FUEL CUT)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode
    5. Start the engine.

      Tech Tips

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

    6. Enter the following menus: Powertrain / Engine / Active Test / Control the Select Cylinder Fuel Cut / Data List / Engine Speed.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Select Cylinder Fuel Cut
      Data List Display
      Engine Speed
    7. According to the display on the GTS, perform the Active Test and check for a malfunctioning cylinder.

      Tech Tips


      • Perform fuel-cut 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 items "Misfire Count Cylinder #1 to #4" increases may be malfunctioning.

      Result
      Result Proceed to
      One cylinder is malfunctioning A
      Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined. B

    B
    A
  7. PERFORM ACTIVE TEST USING GTS (CHECK THE CYLINDER COMPRESSION)

    Tech Tips

    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.


    1. Warm up the engine.

    2. Turn the power switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    5. Turn the GTS on.

    6. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode

      Tech Tips

      Do not start the engine.

    7. Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression / Data List / Compression / Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder.


      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
      Engine Speed Cylinder #4
      Average Engine Speed of All Cylinder

      Tech Tips

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

    8. Push the snapshot button to turn the snapshot function on.

      Tech Tips

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

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

      Tech Tips

      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.

    10. Crank the engine.

      Tech Tips

      Continue to crank the engine until the values change from the default value (51199 rpm).

    11. Monitor the engine speed (Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder) displayed on the GTS.

      Note


      • If the Check the Cylinder Compression Active Test needs to be performed after it is changed to "Start" and performed once, press the Exit button to return to the Active Test menu screen. Then perform the Check the Cylinder Compression Active Test again.

      • As soon as the measurements are obtained, stop the Active Test.

      Tech Tips


      • At first, the GTS display will show each cylinder's engine speed measurement to be extremely high. After the engine has started, each cylinder's engine speed measurement will change to the actual engine speed.

      • If the cylinder engine speed values (Engine Speed Cylinder #1 to #4) displayed in the Data List do not change from an extremely high value, return to the Active Test menu screen, change "Check the Cylinder Compression" to "Start" and crank the engine again within 1 second.

    12. Stop the engine and change the Active Test "Check the Cylinder Compression" to "Stop" after the engine stops.

      Note


      • When performing the Active Test, DTC P160400 (startability malfunction) may be stored.

      • After performing the Active Test, make sure to check and clear the DTCs.

    13. Push the snapshot button to turn the snapshot function off.

    14. Read the value.

      Tech Tips


      • 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
      Result Proceed to

      There is no variation in "Engine Speed Cylinder"

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

      A

      There is variation in "Engine Speed Cylinder"

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

      B

    B
    A
  8. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode
    5. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all accessories off.

    6. Idle the engine.

    7. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.


      Powertrain > Engine > Active Test
      Tester Display
      Control the Injection Volume
    8. According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.

      Tech Tips

      Change the fuel injection volume between the minimum and maximum range of correction (e.g. -12.5% to 24.8%).

      Result
      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
    A
  9. CHECK IGNITION SYSTEM


    1. Check the ignition system.

      Click here

      Tech Tips


      • 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
      Result Proceed to
      The malfunctioning cylinder does not return to normal A
      The malfunctioning cylinder returned to normal B

    B
    A
  10. INSPECT OTHER RELATED COMPONENTS


    1. Check the power source circuit, wire harness and connectors.

      Result
      Proceed to
      NEXT

    NEXT
  11. REPLACE FUEL INJECTOR ASSEMBLY


    1. Replace the fuel injector assembly of the malfunctioning cylinder.

      Click here

      Tech Tips


      • 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

      • If the symptoms tend to improve by decreasing the fuel injection amount, the engine misfire may be due to blockage of an EGR port leading to EGR becoming excessive to the cylinders with little EGR port blockage.

      Result
      Proceed to
      NEXT

    NEXT
  12. CHECK CYLINDER COMPRESSION PRESSURE


    1. 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

      Result
      Proceed to
      NEXT

    NEXT
  13. PERFORM ACTIVE TEST USING GTS (CONTROL THE EGR STEP POSITION)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode
    5. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

      Tech Tips

      The A/C switch and all accessories should be off.

    6. Enter the following menus: Powertrain / Engine / Active Test / Control the EGR Step Position / Data List / Intake Manifold Absolute Pressure and Engine Independent.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the EGR Step Position
      Data List Display
      Intake Manifold Absolute Pressure
      Engine Independent
    7. Confirm that the value of Data List item Engine Independent is "Operate" then check the value of Intake Manifold Absolute Pressure while performing the Active Test.

      Note


      • Do not leave the EGR valve open for 10 seconds or more during the Active Test.

      • Be sure to return the EGR valve to step 0 when the Active Test is completed.

      • Do not open the EGR valve 30 steps or more during the Active Test.

      Result
      Result Proceed to
      Intake Manifold Absolute Pressure increases by less than 10 kPa (1.45 psi) when the EGR valve is fully closed (0 step) A
      Intake Manifold Absolute Pressure increases by 10 kPa (1.45 psi) or higher when the EGR valve is fully closed (0 step) B

      Tech Tips


      • If the value of Data List item Engine Independent is "Not Opr" when the engine is idling, charge control is being performed. Perform the Active Test after charge control is complete ("Operate" is displayed).

      • While performing the Active Test, if the increase in the value of Intake Manifold Absolute Pressure is small, the EGR valve assembly may be malfunctioning.

      • Even if the EGR valve assembly is malfunctioning, rough idling or an increase in the value of Intake Manifold Absolute Pressure may occur while performing the Active Test. However, the amount that the value of Intake Manifold Absolute Pressure increases will be smaller than normal.


    B
    A
  14. REPLACE EGR VALVE ASSEMBLY


    1. Replace the EGR valve assembly.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the EGR valve assembly.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  15. READ VALUE USING GTS (MASS AIR FLOW SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode
    5. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all accessories off.

    6. Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.


      Powertrain > Engine > Data List
      Tester Display
      Engine Speed
      Mass Air Flow Sensor
      Coolant Temperature
    7. According to the display on the GTS, read the Data List when the power switch is turned on (IG) and while maintaining an engine speed of 2500 rpm.

      Tech Tips

      During charge control, the engine speed is set at idle. Therefore, the engine speed will not increase when the accelerator pedal is depressed. In this case, read the Data List after charge control has completed.

      Result
      Result Proceed to
      Other than below A

      Power switch on (IG) (engine stopped): 0.58 gm/sec or higher

      Engine speed 2500 rpm (without load): Less than 4.0 gm/sec

      B

    B
    A
  16. PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode
    5. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the A/C switch and all accessories off.

    6. Idle the engine for 5 minutes or more with park (P) selected.

    7. Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2.


      Powertrain > Engine > Active Test
      Active Test Display
      Control the Injection Volume for A/F Sensor
      Data List Display
      A/F (O2) Sensor Voltage B1S1
      O2 Sensor Voltage B1S2
    8. According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.

      Note


      • The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

      • Read the output voltage immediately after warming up the air fuel ratio sensor and heated oxygen sensor to avoid an inaccurate reading due to a sensor cooling.

      Tech Tips

      The Active Test "Control the Injection Volume for A/F Sensor" can be used to lower the fuel injection volume by 12.5% or increase the injection volume by 12.5%.

      Standard

      GTS Display

      (Sensor)

      Injection Volume Voltage

      A/F (O2) Sensor Voltage B1S1

      (Air fuel ratio)

      12.5% Below 3.1 V
      -12.5% Higher than 3.4 V

      O2 Sensor Voltage B1S2

      (Heated oxygen)

      12.5% Higher than 0.55 V
      -12.5% Below 0.4 V
      Result
      Result Proceed to
      Output voltage 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 voltage values are normal C

    B
    C
    A
  17. REPLACE AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR


    1. Replace the air fuel ratio sensor.

      Click here

      Tech Tips

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

      Click here

    2. Replace the heated oxygen sensor.

      Click here

      Tech Tips

      Perform "Inspection After Repair" after replacing the heated oxygen sensor.

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  18. REMOVE FOREIGN MATTER (CLEAN THROTTLE BODY ASSEMBLY)


    1. Clean off any deposits inside of the throttle body assembly.

    2. Push open the throttle valve and wipe off any deposits from the valve and bore using a piece of cloth soaked in non-residue solvent.

      B006HD6C01
      *1 Throttle Body Assembly *2 Bore
      *3 Throttle Valve - -
      *a Reference *b Throttle Body Assembly Cross-section Diagram
      *c When valve fully opened *d Do not directly apply cleaner
      *e Deposits - -

      Note


      • 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 assembly or wash the throttle body assembly. Non-residue 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 throttle valve, be careful not to remove it.

      Tech Tips

      The illustration is for reference only, actual parts may differ.

      Result
      Proceed to
      NEXT

    NEXT
  19. PERFORM CONFIRMATION DRIVING PATTERN


    1. Perform "Inspection After Repair" after cleaning the throttle body assembly.

      Click here

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Put the engine in Inspection Mode (Maintenance Mode).

      Click here


      Powertrain > Hybrid Control > Utility
      Tester Display
      Inspection Mode
    6. Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher.

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

      Tech Tips

      If the engine is operated without performing learning value reset and idle learning after cleaning the deposits from the throttle body assembly, the idle speed may increase.

      Result
      Proceed to
      NEXT

    NEXT
  20. REPLACE FUEL INJECTOR ASSEMBLY


    1. Replace the fuel injector assemblies of all cylinders.

      Click here

      Tech Tips

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  21. INSPECT OTHER RELATED COMPONENTS


    1. Inspect other related components.

      Tech Tips

      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

      • EGR distribution is poor due to EGR port blockage

      • Delay in fuel supply due to adherence of the fuel to the deposits

      Result
      Proceed to
      NEXT

    NEXT
  22. CHECK INTAKE SYSTEM


    1. 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.

      Tech Tips


      • 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.

      Result
      Proceed to
      NEXT

    NEXT
  23. REPAIR OR REPLACE MALFUNCTIONING PART


    1. Repair or replace the malfunctioning part.

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

      Click here

      Result
      Proceed to
      NEXT

    NEXT
  24. CONDUCT CONFIRMATION TEST


    1. Check that the idle has returned to normal.

      Result
      Proceed to
      NEXT

    NEXT