Ecd System - Rough Idling Or Excessive Engine Vibrations

Lexus IS250 IS220d GSE20 ALE20 2AD-FHV ENGINE CONTROL SYSTEM

DESCRIPTION

INSPECTION PROCEDURE

CHECK CLUTCH SYSTEM

CHECK HARNESS AND CONNECTOR (IN ENGINE ENGINE COMPARTMENT)

PERFORM CONFIRMATION DRIVING PATTERN

CHECK DTC OUTPUT (RELATING TO ENGINE)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL LEAK TEST)

READ VALUE OF INTELLIGENT TESTER (MAP, MAF AND FUEL PRESSURE)

READ VALUE OF INTELLIGENT TESTER (INJECTION FEEDBACK VAL AND INJECTION VOLUME)

CHECK INJECTOR COMPENSATION CODE

RESET ECM

CHECK ENGINE MOUNTING INSULATOR

CHECK INTAKE SYSTEM

CHECK EGR VALVE ASSEMBLY

INSPECT DIESEL THROTTLE BODY ASSEMBLY

CHECK INJECTOR ASSEMBLY (IDENTIFY MALFUNCTIONING CYLINDER INJECTOR)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL CUT FOR IDENTIFYING MALFUNCTIONING CYLINDER)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL CUT FOR IDENTIFYING MALFUNCTION)

CHECK CYLINDER COMPRESSION PRESSURE

CHECK INJECTOR (MALFUNCTIONING CYLINDER'S INJECTOR FOR DEPOSITS)

CLEAN INJECTOR

READ VALUE OF INJECTOR ASSEMBLY (INJECTION FEEDBACK VAL AND INJECTION VOLUME)

CHECK INJECTORS FOR DEPOSITS (EXCEPT FUEL ADDITION INJECTOR)

CLEAN INJECTOR

READ VALUE OF INJECTOR (INJECTION FEEDBACK VAL AND INJECTION VOLUME)

INSPECT COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

INSPECT SUPPLY PUMP ASSEMBLY

ECD SYSTEM - Rough Idling or Excessive Engine Vibrations

DESCRIPTION

Malfunction ConditionMain Trouble AreasRelated Trouble Areas
Rough idling or shuddering due to abnormal combustion
Shuddering when vehicle starting due to clutch system malfunctions
Injector malfunctions
Injector sliding malfunction
Injector stuck closed
Injector stuck open
Deposit in injector
Injector circuit malfunction
Clutch system malfunctions
Clutch system (shuddering when starting)
Injector compensation code
Fuel leak
Engine mounting insulator
Intake air system leakage
Intake air system blockage
EGR system
Throttle valve system
Supply pump
Pressure limiter
Fuel pressure sensor
EDU (P0200/97 set simultaneously)
Low quality fuel
Vehicle modifications
Fuel filter air bleed problem
Accessory problem (A/C, generator, etc.)
ECM
  • HINT:
Rough idling and excessive engine vibrations are checked in this troubleshooting procedure.
Specified values in the following troubleshooting flowchart are for reference only. Variations in the Data List result values may occur depending on the measuring conditions or the vehicle's age. Do not judge the vehicle to be normal even when the Data List values indicate a standard level. There are possibly some concealed factors of the malfunction.
Check that the vehicle has not been modified in any way prior to the vehicle inspection.

INSPECTION PROCEDURE

  • NOTICE:
After replacing the supply pump, the ECM needs initialization .
After replacing the injector, the ECM needs registration .
  • HINT:
Before troubleshooting, conduct the following:
Check the fuel quality.
Check the fuel for air.
Check the fuel system for blockages.
Check the air filter.
Check the engine oil.
Check the engine coolant.
Check the engine idling speed and the maximum engine speed.
Check the vacuum pump.
1.CHECK CLUTCH SYSTEM

Identify when shuddering occurs.

  • Result:
  • Driving ConditionProceed to
    When idlingA
    When engaging engine clutch at vehicle startB
    (Clutch system shudders)
B
Go to step 11
C
Go to step 24
A
7.READ VALUE OF INTELLIGENT TESTER (INJECTION FEEDBACK VAL AND INJECTION VOLUME)

Select the following menu items in order and read the values.

Injection Feedback Val #1, #2, #3, and #4
Injection Volume
  • Standard:
  • ItemEngine Speed*Standard RangeDescription
    Injection Feedback Val #1Idling-3.0 to 3.0 mm3 Value of injector fuel injection volume compensates for differences in combustion condition of cylinders
    Positive values indicate control which corrects combustion degradation
    Negative values indicate control which corrects excessive combustion pressure
    If problems exist, "Injection Feedback Val" may deviate from the -3.0 and 3.0 mm range
    Injection Feedback Val #2Idling-3.0 to 3.0 mm3
    Injection Feedback Val #3Idling-3.0 to 3.0 mm3
    Injection Feedback Val #4Idling-3.0 to 3.0 mm3
    Injection VolumeIdling3.9 to 7.0 mm3 Fuel injection volume value controlled by ECU
    Controls NE signal, fuel temperature, engine coolant temperature, intake air temperature, boost pressure, atmospheric pressure, and EGR volume.
    If problems exist, "Injection Volume" may be outside the standard range
  • Result:
  • ResultProceed to
    Standard rangeA
    Injection Feedback Val #1 to #4 and/or Injection Volume outside standard rangeB
  • HINT:
  • *: The A/C switch and all accessory switches should be OFF with a fully warm engine.
B
Go to step 14
A
8.CHECK INJECTOR COMPENSATION CODE

Read the injector compensation code .

  • HINT:
  • If the injector compensation code is not correctly registered, it may cause malfunctions .

Check the injector compensation code.

  • OK:
  • Compensation code of the installed injector is same as the code registered in the ECM.
NG
Go to step 16
NG
REPLACE DIESEL THROTTLE BODY ASSEMBLY
14.CHECK INJECTOR ASSEMBLY (IDENTIFY MALFUNCTIONING CYLINDER INJECTOR)

Follow the instructions in the table below according to the check result of the intelligent tester.

  • HINT:
  • This operation is based on the premise that the common rail pressure is normal.
  • Standard:
  • ItemEngine Speed*Reference Value
    Injection Feedback Val #1 to #4Idling-3.0 to 3.0 mm3
    Injection VolumeIdling3.9 to 7.0 mm3
  • HINT:
  • *: The A/C switch and all accessory switches should be OFF, and the engine should be fully warmed up.
  • Result:
  • Injection Feedback Val #1 to #4Injection volume
    Less than 3.9 mm3 Between 3.9 to 7.0 mm3 (Normal)More than 7.0 mm3
    3.0 mm3 or more, -3.0 mm3 or lessABB
    Between -3.0 to 3.0 mm3 -NormalC*
  • Proceed toInspection AreasDescriptions
    A Inspect and repair cylinder injector with revised injection volume of less than -3.0 mm3:
    Perform power balance inspection and identify malfunctioning cylinder
    Replace malfunctioning cylinder injector
    		 Abnormal value cylinder injector injects excessively large quantity of fuel
    B Identify malfunctioning cylinders by conducting power balance inspection:
    Perform power balance inspection to identify malfunctioning cylinders
    Clean malfunctioning cylinder injector, then check and repair it
    		 Abnormal value cylinder injector injects excessively large quantity of fuel
    Fuel injection volume too low due to injector nozzle being blocked by deposits
    Abnormal value cylinder injector compression decreases
    Abnormal value cylinder injector injects excessively large quantity of fuel
    C Inspect and repair all cylinder injectors:
    Clean all cylinder injectors, inspect, and repair them    		 All cylinder injectors inject excessively small quantity of fuel:
    Fuel injection volume too low due to all cylinder injector nozzles being blocked by deposits
  • HINT:
  • *: When the Injection Volume displayed on the intelligent tester is large despite the Fuel Press and Injection Feedback Val #1 to #4 in the Data List being normal, the injector may be clogged. In this case, there may be deposits inside or outside the tip of the injector.
Despite the injector functioning normally, the indicated Injection Feedback Val #1 to #4 value may be outside the normal operating range due to compensation for other problems (such as low compression).
Injection Feedback Val #1 to #4 is the value used to correct the fuel injection volumes of each cylinder, in order to optimize (compensate for the unevenness between) all the cylinder combustion conditions. If any of the cylinders malfunction, the fuel injection volumes for the normal cylinders are corrected simultaneously. As a result, the Injection Feedback Val #1 to #4 may deviate from the standard range.
B
Go to step 16
C
Go to step 21
A
15.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL CUT FOR IDENTIFYING MALFUNCTIONING CYLINDER)

Connect the intelligent tester to the DLC3.

Start the engine and turn the intelligent tester ON.

Enter the following menus: Powertrain / Engine / Active Test / Control the Cylinder #1, #2, #3, and #4 Fuel Cut.

Check the four cylinders in sequence to identify any faulty cylinders by performing the power balance inspection.

  • HINT:
If the engine idle speed does not change when an injector is disabled, the cylinder being tested is malfunctioning.
If the cylinder being tested is normal, there will be a significant change of idle speed when the fuel injection is stopped for that cylinder.
NEXT
REPLACE INJECTOR OF MALFUNCTIONING CYLINDER
16.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL CUT FOR IDENTIFYING MALFUNCTION)

Connect the intelligent tester to the DLC3.

Start the engine and turn the intelligent tester ON.

Enter the following menus: Powertrain/ Engine / Active Test / Control the Cylinder #1, #2, #3, and #4 Fuel Cut.

Check the four cylinders in sequence to identify any faulty cylinders by performing the power balance inspection.

  • HINT:
If the engine idle speed does not change when an injector is disabled, the cylinder being tested is malfunctioning.
If the cylinder being tested is normal, there will be a significant change of idle speed when the fuel injection is stopped for that cylinder.
NEXT
17.CHECK CYLINDER COMPRESSION PRESSURE

Check the cylinder compression pressure.

  • Standard:
  • 2,700 kPa (27.5 kgf/cm2, 392 psi)
  • Minimum pressure:
  • 2,200 kPa (22.4 kgf/cm2, 319 psi)
  • Difference between each cylinder:
  • 500 kPa (5.1 kgf/cm2, 73 psi)
NG
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
OK
18.CHECK INJECTOR (MALFUNCTIONING CYLINDER'S INJECTOR FOR DEPOSITS)
  • HINT:
  • If an injector is contaminated with deposits, the fuel injection volume deviates from the standard range. This may cause malfunctions.

Check the injector for any deposits.

  • Result:
  • Injector ConditionProceed to
    DepositsA
    No depositsB
B
REPLACE INJECTOR OF MALFUNCTIONING CYLINDER
A
19.CLEAN INJECTOR

Wipe away deposits from the tips of the injectors.

  • HINT:
Solvent or carbon removal agents help remove the deposits easily.
Exercise extreme care not to damage the injectors while wiping off the deposits.
NEXT
20.READ VALUE OF INJECTOR ASSEMBLY (INJECTION FEEDBACK VAL AND INJECTION VOLUME)

Reinstall the injector to the cylinder head.

Connect the intelligent tester to the DLC3.

Turn the engine switch ON (IG) and turn the intelligent tester ON.

Start the engine and warm it up.

Enter the following menus: Powertrain / Engine / Data List.

Select the following menu items in order and read the values.

Injection Feedback Val #1, #2, #3, and #4
Injection Volume
  • Standard:
  • ItemEngine Speed*Reference Value
    Injection Feedback Val #1 to #4Idling-3.0 to 3.0 mm3
    Injection VolumeIdling3.9 to 7.0 mm3
  • HINT:
  • *: The A/C switch and all accessory switches should be OFF, and the engine should be fully warmed up. When the values are outside the standard range, deposits inside the injector may be causing the problem.
  • OK:
  • Values are within the standard range.
NG
REPLACE INJECTOR OF MALFUNCTIONING CYLINDER
OK
END
21.CHECK INJECTORS FOR DEPOSITS (EXCEPT FUEL ADDITION INJECTOR)
  • HINT:
  • If an injector is contaminated with deposits, the fuel injection volume deviates from the standard range. This may cause malfunctions.

Check the injector for any deposits.

  • Result:
  • Injector ConditionProceed to
    DepositsA
    No depositsB
B
REPLACE INJECTORS
A
22.CLEAN INJECTOR

Wipe away deposits from the tips of the injectors.

  • HINT:
Solvent or carbon removal agents help remove the deposits easily.
Exercise extreme care not to damage the injectors while wiping off the deposits.
NEXT
23.READ VALUE OF INJECTOR (INJECTION FEEDBACK VAL AND INJECTION VOLUME)

Reinstall the injector to the cylinder head.

Connect the intelligent tester to the DLC3.

Turn the engine switch ON (IG) and turn the intelligent tester ON.

Start the engine and warm it up.

Enter the following menus: Powertrain / Engine / Data List.

Select the following menu items in order and read the values.

Injection Feedback Val #1, #2, #3, and #4
Injection Volume
  • Standard:
  • ItemEngine Speed*Reference Value
    Injection Feedback Val #1 to #4Idling-3.0 to 3.0 mm3
    Injection VolumeIdling3.9 to 7.0 mm3
  • HINT:
  • *: The A/C switch and all accessory switches should be OFF, and the engine should be fully warmed up. When the values are outside the standard range, deposits inside the injector may be causing the problem.
  • OK:
  • Values are within the standard range.
NG
REPLACE INJECTORS
OK
END
24.INSPECT COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)
Ecd System - Rough Idling Or Excessive Engine Vibrations. 2AD-FHV ENGINE CONTROL SYSTEM. Lexus IS250 IS220d GSE20 ALE20

Disconnect the E65 fuel sensor connector.

Measure the resistance between each terminal of the fuel pressure sensor connector.

  • Standard resistance:
  • Tester ConnectionSpecified Condition
    PR (E65-5) - E2 (E65-4)16.4 kΩ or less
    PR2 (E65-2) - E2S (E65-3)16.4 kΩ or less
    PR (E65-5) - VC (E65-6)3 kΩ or less
    PR2 (E65-2) - VCS (E65-1)3 kΩ or less

Reconnect the fuel pressure sensor connector.

NG
REPLACE COMMON RAIL ASSEMBLY
OK
25.INSPECT SUPPLY PUMP ASSEMBLY

Measure the resistance of the suction control valve terminals.

  • Standard resistance:
  • ConditionSpecified Condition
    20°C (68°F)1.9 to 2.3 Ω
NG
REPLACE SUPPLY PUMP ASSEMBLY
OK
CHECK AND REPLACE COMMON RAIL ASSEMBLY (PRESSURE DISCHARGE VALVE)