1Kd-Ftv Engine Control. Ecd System Rough Idling Or Excessive Engine Vibrations

Malfunction Condition	Main Trouble Area	Related Trouble Area
Rough idling or juddering due to abnormal combustion Juddering when vehicle is starting due to clutch system malfunctions	Injector assembly malfunctions Injector sliding malfunction Injector stuck closed Injector stuck open Deposits in injector Injector circuit malfunction Clutch system malfunctions Clutch system (juddering when starting)	Injector compensation code Fuel leak Engine mounting Intake air system leakage Intake air system blockage EGR system Throttle valve system Mass air flow meter Suction control valve Fuel pressure sensor Injector driver (P0200 stored simultaneously) Low quality fuel Vehicle modifications Fuel filter element sub-assembly air bleed problem Accessory problem (A/C, generator, etc.) Active control engine mounting ECM

HINT:

This troubleshooting procedure checks for the cause of rough idling and excessive engine vibrations.
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 causing the malfunction.
Check that the vehicle has not been modified in any way prior to the vehicle inspection.

Faults and Symptoms of Common Rail Diesel Components

Engine Control

Mass Air Flow Meter
Main fault		Decrease in performance (foreign matter is stuck)
Symptoms		Lack of power, black smoke
Data List		MAF
HINT: The maximum fuel injection volume is controlled according to the output from the mass air flow meter.

Glow System
Main fault		Open circuit, glow plug relay fault
Symptoms		Difficult to start, rough idle, knocking, white smoke (when cold)
Data List		Check the glow plug indicator light
Diagnostic Point		Measure the resistance of the glow plug

Engine
Main fault		Loss of compression
Symptoms		Rough idle (lack of power always)
Data List		Engine Speed of Cyl When cranking during the "Check the Cylinder Compression" Active Test, if there is a high speed cylinder, approx. 100 rpm more than the other cylinders, that cylinder may lose compression. Injection Feedback Val When an Injector Feedback Val is more than 3 mm³/st, there may be a malfunction in the corresponding cylinder.

Diesel Injection

Fuel Supply Pump Assembly
Main fault		-
Symptoms		Difficult to start, engine stalling, rough idle, lack of power
Data List		Fuel Press, Target Common Rail Pressure, Target Pump SCV Current In a stable condition (e.g. idling), Fuel Press is within 5000 kPa of "Target Common Rail Pressure". If the fuel pressure is 20000 kPa below the target pressure, then a lack of power will be felt. If the fuel pressure is below 25000 kPa, then idling will be rough. HINT: The fuel pressure changes at engine start, but is approx. 25000 kPa at engine start after the engine is warmed up. When Target Pump SCV Current is 3000 mA or higher, the suction control valve has a tendency to become stuck.
Diagnostic Trouble Code		Even if Fuel Press is below Target Common Rail Pressure, a DTC will not be stored.

Fuel Filter Element Sub-assembly
Main fault		Blockage
Symptoms		Difficult to start, engine stalling, rough idle, lack of power
Data List		Fuel Press, Target Common Rail Pressure In a stable condition (e.g. idling), the fuel pressure is within 5000 kPa of "Target Common Rail Pressure". If the fuel pressure is 20000 kPa below the target pressure, then a lack of power will be felt. If the fuel pressure is below 25000 kPa, then idling will be rough. HINT: The fuel pressure changes at engine start, but is approx. 25000 kPa at engine start after the engine is warmed up.
Diagnostic Trouble Code		Even if Fuel Press is below Target Common Rail Pressure, a DTC will not be stored.

Injector Assembly
Main fault		Blockage
Symptoms		Rough idle, lack of power, black smoke, white smoke, knocking
Data List		Injection Feedback Val When an Injector Feedback Val is more than 3 mm³/st, there may be a malfunction in the corresponding cylinder. This value can be read after idling for 1 minute with the engine warmed up (engine coolant temperature is higher than 70°C (158°F)).

Injector Driver
Main fault		Circuit fault: The fuel injector assembly does not open.
Symptoms		Difficult to start, rough idle, lack of power, black smoke, white smoke, knocking
Data List		Same as injector assembly
Diagnostic Trouble Code		When the injector driver has a fault, some DTCs may be stored.

Fuel Pressure Sensor
Main fault		Open circuit, decrease in performance (foreign matter is stuck)
Symptoms		Difficult to start, rough idle, engine stall, lack of power
Data List		Fuel Press, Target Common Rail Pressure Slowly raise the engine speed from idling to 3000 rpm with the vehicle stopped and check that Fuel Press follows Target Common Rail Pressure. If the fuel pressure sensor malfunctions, the actual fuel pressure may deviate from the target fuel pressure (however, the value may not deviate even when a malfunction is present).
Diagnostic Trouble Code		When the fuel pressure sensor has a fault, some DTCs may be stored.

Irregular Fuel
Main fault		-
Symptoms		Difficult to start, rough idle (especially when cold)

Diesel EGR

EGR System
Main fault		Does not move smoothly Does not close completely
Symptoms		Rough idle EGR valve stuck closed: A loud turbocharger sound. EGR valve stuck open: Difficult to start (does not stall), black smoke, lack of power (if there is an excess in the quantity of EGR and there is a heavy load, when the vehicle starts moving, a lack of power will be felt).
Data List		Actual EGR Valve Pos., Target EGR Pos. Generally, Actual EGR Valve Pos. = Target EGR Pos. +/-5% (fully closed: 0%, fully open: 100%). Using the EGR valve Active Test, check whether Actual EGR Valve Pos. follows Target EGR Pos. (the engine coolant temperature and intake air temperature should be considered when a malfunction occurs). EGR valve is fully closed when the ignition switch is turned to ON (engine stopped). EGR valve opens to the halfway point at idling after the engine is warmed up. EGR Close Lrn. Val., EGR Close Lrn. Status When leaving the vehicle idling, when EGR Close Lrn. Status is OK, the normal range of EGR Close Lrn. Val. is 0 to 1 V. In cases when EGR Close Lrn. Status. is NG or EGR Close Lrn. Val. is out of the normal range (0 to 1 V), it is possible that the EGR valve cannot completely close.

Diesel Throttle

Diesel Throttle System
Main fault		Stuck, does not move smoothly
Symptoms		Stuck closed: Lack of power, difficult to start, rough idle, engine stall, black smoke. These may occur when stuck almost fully closed. Stuck open: Turbocharger sound increases. When the engine is stopped, engine vibrations may occur.
Data List		Actual Throttle Position 0%: Fully open 100%: Fully closed When the ignition switch is ON (the engine is stopped), the diesel throttle is fully open. When idling, the diesel throttle is at the halfway point. When the ignition switch is turned from ON to off, the throttle is fully closed temporarily.

Data List Related to Lack of Power

Engine Speed
MAF
Intake Air
Coolant Temp
Engine Speed of Cyl #1 (to #4)
Target Common Rail Pressure
Fuel Press
Target Pump SCV Current
Injection Feedback Val #1 (to #4)
Injection Volume
Actual Throttle Position
Target EGR Position
Actual EGR Valve Pos.
EGR Close Lrn. Status
EGR Close Lrn. Val.

INSPECTION PROCEDURE

NOTICE:

After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
After replacing the fuel supply pump assembly, the ECM needs initialization (LandCruiser RM000000TIN08CX.html).
After replacing an injector assembly, the ECM needs registration (LandCruiser RM0000012XK0ARX.html).

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.1Kd-Ftv Engine Control.Ecd System.Ecd System Rough Idling Or Excessive Engine Vibrations

HINT:

The figure above shows data recorded during rough idling caused by a decrease in the fuel injection volume of the injector assembly of cylinder 1.

Due to the decrease in the fuel injection volume of the injector assembly of cylinder 1, combustion in cylinder 1 worsens and Injection Feedback Val #1 becomes stuck at the maximum value of 5 mm³/st in an attempt to compensate.

In addition, as Fuel Press and Target Common Rail Pressure have almost the same value, it can be concluded that there is no problem with the fuel pressure or fuel supply pump assembly.

Data Recorded during Rough Idling and Data of Normal Vehicle Recorded during Idling
Data List	Reference Values Recorded during Rough Idling	Reference Values of Normal Vehicle Recorded while Idling	Unit
Injection Volume	20.48	5.00	mm³/st
Injection Feedback Val #1	5.0	0.3	mm³/st
Injection Feedback Val #2	0.1	-0.4	mm³/st
Injection Feedback Val #3	-2.2	-0.8	mm³/st
Injection Feedback Val #4	-3.3	0.4	mm³/st
MAF	11.95	8.12	g/sec.
MAP	99	97	kPa
Engine Speed	805	749	rpm
Fuel Press	40640	30600	kPa
Target Common Rail Pressure	40530	33000	kPa
Coolant Temp	41	84	°C
Target Pump SCV Current	1082.7	997.1	mA
Intake Air	34	16	°C
Engine Run Time	41	137	seconds
A/C Signal	ON	OFF	-

HINT:

The figure above shows data recorded during an injector assembly operation malfunction caused by foreign matter in the fuel (sand that has passed through the fuel filter element sub-assembly) damaging the inside of the injector assembly. As it is difficult for the nozzle inside the injector assembly to move, the fuel injection volume decreases and the system cannot compensate for the difference in torque between the cylinders causing rough idling (Injection Feedback Val #3 becomes stuck at the maximum value of 5 mm³/st).

Data Recorded during Rough Idling and Data of Normal Vehicle Recorded during Idling
Data List	Reference Values Recorded during Rough Idling	Reference Values Recorded while Idling at normal condition	Unit
Injection Volume	12.42	5.00	mm³/st
Injection Feedback Val #1	-0.4	0.3	mm³/st
Injection Feedback Val #2	-4.6	-0.4	mm³/st
Injection Feedback Val #3	5.0	-0.8	mm³/st
Injection Feedback Val #4	-0.7	0.4	mm³/st
MAF	8.46	8.12	g/sec.
MAP	99	97	kPa
Engine Speed	757	749	rpm
Fuel Press	34530	30600	kPa
Target Common Rail Pressure	37250	33000	kPa
Coolant Temp	69	84	°C
Target Pump SCV Current	1227.7	997.1	mA
Intake Air	41	16	°C
Engine Run Time	51	137	seconds
A/C Signal	OFF	OFF	-

1.CHECK MALFUNCTION CONDITION

Identify when shuddering occurs.
Result
Result
Proceed to
When idling
A
When engaging engine clutch at vehicle start
B
(Clutch system shudders)

REPAIR OR REPLACE CLUTCH SYSTEM

A

2.CHECK WIRE HARNESS AND CONNECTION IN ENGINE COMPARTMENT

Check the wire harness and connector connections of common rail system components.
OK:
The wire harnesses and connectors are connected securely.
HINT:
The engine may have problems when there is an intermittent disconnection in a circuit related to the fuel pressure sensor, crankshaft position sensor, engine coolant temperature sensor, etc.

Go to step 15

OK

3.READ OUTPUT DTC (RELATING TO ENGINE)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON and turn the tester on.

Enter the following menus: Powertrain / Engine and ECT / DTC.

Read pending DTCs.

Result
Result	Proceed to
No DTCs are output	A
Engine related DTCs are output	B

GO TO DTC CHART (LandCruiser RM0000031HW07LX.html)

A

4.TAKE SNAPSHOT DURING IDLING (PROCEDURE 4)

Connect the intelligent tester to the DLC3.

Start the engine and turn the tester on.

Warm up the engine (engine coolant temperature is 70°C (158°F) or higher).

Enter the following menus: Powertrain / Engine and ECT / Data List / All Data.

Take a snapshot when idling with no load after the engine is warmed up.
HINT:
1. A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting.
2. Graphs can be displayed by transferring the stored snapshot data from the tester to a PC. Intelligent Viewer must be installed on the PC.
3. The shift lever should be in neutral and the A/C switch and all accessory switches should be off.
4. If rough idling occurs when the A/C switch is on, take another snapshot with the A/C switch on.

NEXT

5.CHECK WHITE SMOKE

Start the engine.

Fully depress the accelerator pedal, and then release it.

Check whether white smoke is emitted when racing the engine.
NOTICE:
Be sure not to check for white smoke indoors.
HINT:
Depending on whether there is oil mixed with the fuel, or whether there is unburned fuel present, the smell of the exhaust gas differs. When oil is mixed in, the exhaust gas smells like burning oil.
Result
Result
Proceed to
White smoke is not emitted
A
White smoke is emitted
B

Go to step 16

A

6.CHECK DATA LIST (ENGINE SPEED)

Check engine speed in the snapshot taken in procedure 4 when the engine was idling.

Result
Result
Proceed to
Change in engine speed coincides with air conditioning system operation
B
Except above
A

Go to step 17

A

7.CHECK DATA LIST (INJECTION FEEDBACK VAL #1 TO #4 AND INJECTION VOLUME)

Check Injection Feedback Val #1 to #4 in the snapshot taken in procedure 4 when the engine was idling.

Result
Result
Proceed to
Injection Feedback Val for at least one cylinder is more than 3 mm³/st and engine vibration is abnormally large
A
Except above
B
HINT:
1. When there is a problem with the operation of an injector assembly due to foreign matter in the inside of the injector assembly, etc., the fuel injection volume decreases. As a result, the ECM gives instructions to increase the fuel injection volume, which causes Injection Feedback Val to increase.
2. The ECM controls the system so that the sum of Injection Feedback Val for all of the cylinders is approximately 0 mm³/st. Even if the value of Injection Feedback Val for a cylinder is less than -3.0 mm³/st, as long as the value of Injection Feedback Val for each of the other cylinders is 3.0 mm³/st or less, the injector assemblies are not malfunctioning.

Go to step 18

A

8.INSPECT INJECTOR COMPENSATION CODE

Read the injector compensation code (LandCruiser RM0000012XK0ARX_02_0006.html).
OK:
Compensation codes stored in the ECM match compensation codes of the installed injector assemblies.

Go to step 14

OK

9.REPLACE FUEL FILTER ELEMENT SUB-ASSEMBLY

Replace the fuel filter element sub-assembly.

NEXT

10.BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).

NEXT

11.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE CYLINDER #1 TO #4 FUEL CUT)

HINT:

Use this Active Test to determine the malfunctioning cylinder.

Connect the intelligent tester to the DLC3.

Start the engine and turn the tester on.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Cylinder #1 to #4 Fuel Cut.
HINT:
1. If the engine idle speed does not change when an injector assembly is disabled, the cylinder being tested is malfunctioning.
2. If the cylinder being tested is normal, there will be a significant change in idle speed when the fuel injection is stopped for that cylinder.

NEXT

12.REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDER

Replace the injector assembly of the malfunctioning cylinder (LandCruiser RM0000044TN015X.html).

NEXT

13.BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).

NEXT

14.REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING

Perform the injector pilot quantity learning (LandCruiser RM0000012XK0ARX_02_0009.html).

Go to step 30

15.REPAIR OR REPLACE HARNESS AND CONNECTOR

Repair or replace the harness or connector.

Go to step 30

16.CHECK AND REPAIR ENGINE ASSEMBLY

Check the following items and repair the malfunctioning part if necessary.
1. Check cylinder compression pressure (LandCruiser RM00000147302LX_01_0002.html).
2. Inspect the glow plug assembly (LandCruiser RM0000044ZK00RX_01_0001.html).

Go to step 30

17.CHECK AIR CONDITIONING SYSTEM

Check the air conditioning system.
HINT:
1. Be sure to check the air conditioning hoses and pipes.
2. Check the coolant pressure (LandCruiser RM000001R8Z04QX_01_0001.html).

Go to step 30

18.CHECK DATA LIST (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)

Check Fuel Press and Target Common Rail Pressure in the snapshot taken when the engine was idling.

Result
Result
Proceed to
Fuel Press is more than 5000 kPa from Target Common Rail Pressure
A
Except above
B

Go to step 27

A

19.CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM)

Disconnect the suction control valve connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open):
Tester Connection
Condition
Specified Condition
C71-1 - C92-23 (PCV+)
Always
Below 1 Ω
C71-2 - C92-12 (PCV-)
Always
Below 1 Ω
Standard Resistance (Check for Short):
Tester Connection
Condition
Specified Condition
C71-1 or C92-23 (PCV+) - Body ground
Always
10 kΩ or higher
C71-2 or C92-12 (PCV-) - Body ground
Always
10 kΩ or higher
HINT:
When there is an open circuit, Target Pump SCV Current is outside the range of 923 to 1123 mA.

Reconnect the suction control valve connector.

Reconnect the ECM connector.

Go to step 24

OK

20.CHECK IF FUEL IS BEING SUPPLIED TO FUEL SUPPLY PUMP ASSEMBLY

Disconnect the inlet hose from the fuel supply pump assembly.

Operate the priming pump and check that fuel is being supplied to the fuel supply pump assembly.
OK:
Fuel is properly supplied to the fuel supply pump assembly when the priming pump is operated.
HINT:
1. When there is a lack of fuel, the fuel pressure drops.
2. Inspect for fuel filter element sub-assembly clogging.

Reconnect the inlet hose.

Go to step 25

OK

21.REPLACE SUCTION CONTROL VALVE

Replace the suction control valve (LandCruiser RM000004MF600KX.html).

NEXT

22.BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).

NEXT

23.PERFORM FUEL SUPPLY PUMP INITIALIZATION

Perform fuel supply pump initialization (LandCruiser RM000000TIN08CX.html).

Go to step 30

24.REPAIR OR REPLACE HARNESS AND CONNECTOR

Repair or replace the harness or connector.

Go to step 30

25.CHECK AND REPAIR OR REPLACE CLOGGED FUEL PIPE (INCLUDING FROZEN FUEL) (FUEL TANK - FUEL SUPPLY PUMP)

Check and repair or replace the clogged fuel pipe.

NEXT

26.BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).

Go to step 30

27.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ACTIVATE THE VSV FOR EGR CUT)

Connect the intelligent tester to the DLC3.

Start the engine and warm it up, and make sure the A/C switch and all accessory switches are off.

Turn the ignition switch off. Wait for 30 seconds, and then restart the engine.

Turn the tester on.

Enter the following menus: Powertrain / Engine and ECT / Data List / MAF.

Read the MAF value displayed on the tester while the engine is idling.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EGR Cut or Activate the EGR valve Close.

Read the mass air flow meter value when the VSV for EGR Cut or electric vacuum regulating valve assembly is turned from off to on using the Active Test function.

HINT:

If idling continues for 15 minutes or more, the EGR valve target opening angle becomes 0% (EGR valve fully closed). As this makes diagnosis impossible, it becomes necessary to drive the vehicle or to restart the engine.
Before performing the diagnosis, confirm that the EGR valve target opening angle is not 0%.
When "Coolant Temp" is 75°C (167°F) or higher during idling, the exhaust gas flows through the EGR cooler. If MAF does not change when the EGR is cut even though the EGR valve is operating normally, the EGR cooler may be clogged.
When idling while warming up the engine, the actuator operates and the EGR cooler is bypassed. However, if the connector of the VSV for the EGR cooler is disconnected, the EGR cooler is not bypassed and it is possible to check how clogged the EGR cooler is.

Result
Active Test	Result	Proceed to
Activate the VSV for EGR Cut: Off (Open) to on (Close)	MAF value does not change	A
Activate the VSV for EGR Cut: Off (Open) to on (Close)	MAF value changes	B

NOTICE:

As the values shown below may differ due to factors such as differences in measuring environments and changes in vehicle condition due to aging, do not use these values to determine whether the vehicle is malfunctioning or not.

HINT:

The problem may be a temporary one, due to the entry of deposits or foreign matter. Check that there are no deposits or foreign matter in the electric vacuum regulating valve assembly or mass air flow meter.

Reference:

EGR Valve Condition (Opening)	Measuring Condition	MAF (Reference)
Open (55%)	Atmosphere pressure: 101 kPa Intake air temperature: 30°C (86°F) Engine coolant temperature: 88°C (190°F)	4.5 to 10.5 g/sec
Close (0%)		13 to 20 g/sec

Go to step 29

A

28.REMOVE DEPOSIT (ELECTRIC EGR CONTROL VALVE ASSEMBLY)

Remove the electric EGR control valve assembly.

Visually check the electric EGR control valve assembly for deposits.
If there are deposits, clean the electric EGR control valve assembly.
HINT:
1. If the EGR valve is stuck closed, the intake air amount increases and engine vibration may worsen.
2. If the EGR valve does not operate due to clogging or disconnection of the vacuum hose, repair the hose.
3. If the EGR valve does not close properly or is stuck open, EGR becomes excessive and combustion becomes unstable. Also, there may be a lack of power. In this case, clean the electric EGR control valve assembly.
4. When cleaning the electric vacuum regulating valve assembly, use a piece of cloth soaked with non-residue solvent. Spraying the solvent directly onto these parts or soaking the parts in solvent may damage the parts.

Reinstall the electric EGR control valve assembly.

Go to step 30

29.CHECK AND REPLACE ENGINE MOUNTING INSULATOR

Check the following items and repair or replace the malfunctioning part if necessary.
1. Check that the engine mounting insulators are installed correctly.
2. Check that the engine mounting insulators are not twisted.
3. Check that deformation of an engine mounting insulator is not causing the engine to contact the vehicle body.
4. Check that the active control engine mount system (LandCruiser RM000002VGL011X.html).

NEXT

30.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

END

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

Result	Proceed to
White smoke is not emitted	A
White smoke is emitted	B

Result	Proceed to
Change in engine speed coincides with air conditioning system operation	B
Except above	A

Result	Proceed to
Injection Feedback Val for at least one cylinder is more than 3 mm³/st and engine vibration is abnormally large	A
Except above	B

Result	Proceed to
Fuel Press is more than 5000 kPa from Target Common Rail Pressure	A
Except above	B

Tester Connection	Condition	Specified Condition
C71-1 - C92-23 (PCV+)	Always	Below 1 Ω
C71-2 - C92-12 (PCV-)	Always	Below 1 Ω