Malfunction Condition	Main Trouble Areas	Related 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 Condition Proceed to
When idling A
When engaging engine clutch at vehicle start B
(Clutch system shudders)

Go to step 11

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:

Item	Engine Speed*	Standard Range	Description
Injection Feedback Val #1	Idling	-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 #2	Idling	-3.0 to 3.0 mm³
Injection Feedback Val #3	Idling	-3.0 to 3.0 mm³
Injection Feedback Val #4	Idling	-3.0 to 3.0 mm³
Injection Volume	Idling	3.9 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:
Result Proceed to
Standard range A
Injection Feedback Val #1 to #4 and/or Injection Volume outside standard range B

HINT:

*: The A/C switch and all accessory switches should be OFF with a fully warm engine.

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.

Go to step 16

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:
Item Engine Speed* Reference Value
Injection Feedback Val #1 to #4 Idling -3.0 to 3.0 mm³
Injection Volume Idling 3.9 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 #4 Injection 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 less A B B
Between -3.0 to 3.0 mm³ - Normal C*

Proceed to	Inspection Areas	Descriptions
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.

Go to step 16

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.

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)

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 Condition Proceed to
Deposits A
No deposits 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:
Item Engine Speed* Reference Value
Injection Feedback Val #1 to #4 Idling -3.0 to 3.0 mm³
Injection Volume Idling 3.9 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.

REPLACE INJECTOR OF MALFUNCTIONING CYLINDER

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 Condition Proceed to
Deposits A
No deposits 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:
Item Engine Speed* Reference Value
Injection Feedback Val #1 to #4 Idling -3.0 to 3.0 mm³
Injection Volume Idling 3.9 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.

REPLACE INJECTORS

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 Connection Specified 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.

REPLACE COMMON RAIL ASSEMBLY

OK

25.INSPECT SUPPLY PUMP ASSEMBLY

Measure the resistance of the suction control valve terminals.

Standard resistance:
Condition Specified Condition
20°C (68°F) 1.9 to 2.3 Ω

REPLACE SUPPLY PUMP ASSEMBLY

CHECK AND REPLACE COMMON RAIL ASSEMBLY (PRESSURE DISCHARGE VALVE)

LEXUS IS250, IS220d / GSE20 ALE20

2AD-FHV ENGINE CONTROL SYSTEM

Lexus IS250 IS220d GSE20 ALE20

ECD SYSTEM

Driving Condition	Proceed to
When idling	A
When engaging engine clutch at vehicle start	B (Clutch system shudders)