Ecd System - Engine Knocking Or Rattling

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

DESCRIPTION

INSPECTION PROCEDURE

CHECK ENGINE SOUND

CHECK HARNESS AND CONNECTOR (ENGINE WIRE HARNESS)

PERFORM CONFIRMATION DRIVING PATTERN

READ DTC OUTPUT (RELATING TO ENGINE)

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (TEST THE FUEL LEAK)

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

READ VALUE OF INTELLIGENT TESTER (INJECTION FEED BACK VAL AND INJECTION VOLUME)

CHECK INJECTOR COMPENSATION CODE

RESET ECM

CHECK INTAKE SYSTEM

CHECK EGR VALVE ASSEMBLY

INSPECT DIESEL THROTTLE BODY ASSEMBLY

CHECK ENGINE SOUND

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 INTELLIGENT TESTER (INJECTION FEEDBACK VAL AND INJECTION VOLUME)

CHECK INJECTOR ASSEMBLY (IDENTIFY MALFUNCTIONING CYLINDER INJECTOR)

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

CHECK INJECTORS FOR DEPOSITS (EXCEPT FUEL ADDITION INJECTOR)

CLEAN INJECTOR

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

BLEED AIR FROM FUEL SYSTEM

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

INSPECT COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

INSPECT SUPPLY PUMP ASSEMBLY

ECD SYSTEM - Engine Knocking or Rattling

DESCRIPTION

Malfunction ConditionMain Trouble AreasRelated Trouble Areas
Knocking and abnormal sound due to extremely rich combustion
Abnormal sound due to friction between parts
Injector malfunctions
Injector sliding malfunction
Injector stuck closed
Injector stuck open
Deposits in injector
Injector circuit malfunction
Abnormal common rail pressure
Supply pump
Fuel pulsation sound
Air in fuel
Friction between parts
Compression pressure
Injector compensation codes
Fuel leakage
Intake air system leakage
Intake air system blockage
EGR system
Throttle valve system
Fuel pressure sensor
Manifold absolute pressure sensor
Atmosphere air pressure sensor (built into ECM)
Vehicle modifications
Low quality fuel
Lack of fuel
ECM
  • HINT:
Specified values in the following troubleshooting flowchart are for reference only. Variations in the Data List 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 an injector, the ECM needs registration .
  • HINT:
This troubleshooting procedure checks for knocking and rattling.
Knocking is most likely to occur while the engine is idling.
1.CHECK ENGINE SOUND

Find source of the abnormal sound using a mechanic's stethoscope.

  • Result:
  • ResultProceed to
    Sound from supply pumpA
    Sound from parts other than supply pumpB
B
Go to step 10
C
Go to step 26
A
7.READ VALUE OF INTELLIGENT TESTER (INJECTION FEED BACK 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 -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 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, and the engine should be fully warmed up.
B
Go to step 19
A
8.CHECK INJECTOR COMPENSATION CODE
  • HINT:
  • If the injector compensation code is not correctly registered, it may cause malfunctions .
  • OK:
  • Compensation code of the installed injector is the same as the code registered in the ECM.
NG
Go to step 24
A
14.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:
While the engine is idling, if the idling stability variation is small despite cutting off the fuel injection, the cylinder is malfunctioning.
With normal cylinders, the engine idles roughly when the fuel injection is cut off.
NEXT
15.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
Go to step 16
C
Go to step 21
A
20.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 does not change when and 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 ASSEMBLY OF MALFUNCTIONING CYLINDER
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 INTELLIGENT TESTER (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 displayed on the intelligent tester respectively.

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

*: The A/C switch and all accessory switches should be OFF, and the engine should be fully warmed up.


  • HINT:
  • 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.BLEED AIR FROM FUEL SYSTEM

To bleed air from the priming pump, pump the priming pump until it becomes hard and cannot be pumped any more.

NEXT
25.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Check whether the knocking has been successfully repaired by performing a driving test.

  • OK:
  • Malfunction has been repaired successfully.
NEXT
END
26.INSPECT COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)
Ecd System - Engine Knocking Or Rattling. 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
27.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
REPAIR OR REPLACE COMMON RAIL ASSEMBLY (PRESSURE DISCHARGE VALVE)