1Gd-Ftv Engine Control. Ecd System Turbocharger Noise

Turbocharger noise is classified into two types. These are whistling sound and chattering sound. During troubleshooting, first determine the type of noise.

Description
Noise Type	Noise Description	Main Trouble Area
Whistling sound (airflow sound)	The whistling sound volume and pitch are proportional to the turbocharger or engine speed. The abnormal noise level becomes clear when the engine speed is increased.	Turbocharger (example: unstable shaft) Transmission gears Leak in intake system Damaged intake system
Chattering sound (metallic sound)	The chattering sound pitch is lower than the whistling sound pitch. Has a comparatively constant pitch that is independent of the engine speed and vehicle speed.	Turbocharger HINT: The turbocharger vibrations are transmitted to the exhaust pipe, causing noise and resonance. The turbocharger vibrations are transmitted through the exhaust pipe to the chassis (floor), causing noise and resonance in the chassis.

Faults and Symptoms of Diesel Engine Components

Turbocharger System
Main fault		Unstable turbocharger turbine shaft (interference, seizing, poor balance, etc.)
Symptoms		High-pitched whistling noise HINT: The volume and pitch are proportional to the turbocharger speed. Metallic sound due to looseness

Intake System
Main fault		Leak
Symptoms		Abnormal noise during intake leak

Transmission Gear
Symptoms		Gear noise HINT: The pitch and volume change in proportion to the transmission gear speed.

INSPECTION PROCEDURE

1.CONFIRM CONDITION IN WHICH NOISE OCCURRED

Confirm with the customer the condition when noise occurred.

HINT:

To clearly understand the conditions in which the noise occurred, the items in the table below are useful.

Item	Note
Engine speed	Engine speed range
Vehicle speed	Vehicle speed range
Transmission gear	Which gear?
Accelerator pedal position	During acceleration or deceleration?
Temperature	Ambient temperature Engine temperature (cold, warmed up, etc.)
Road conditions	City or highway driving Uphill or downhill
Noise level	Did the noise occur suddenly, or build gradually? Has the noise gradually been getting louder?
Other symptoms	Lack of power High fuel consumption, etc.
Noise recognition	What made the customer determine that the sound was a malfunction?

NEXT

2.PERFORM SIMULATION TEST

Check whether the noise described by the customer occurs.
HINT:
If an abnormal noise is heard, check whether it matches the noise described by the customer.

Result:
Result	Proceed to
Abnormal noise generated while idling (ticking or rattling (metallic sound))	A
Abnormal noise generated while driving	B

Go to step 5

A

3.CHECK FOR NOISE FROM SOURCE OTHER THAN TURBOCHARGER

Check for the noise source with a sound scope.

The source of the noise is not the turbocharger, but a part other than the turbocharger (e.g. a part inside the engine, transmission, or vacuum pump).

Sometimes gear noise may be mistaken for turbocharger noise. For gear noise, pay attention to the gear inside the engine and transmission gear.

Rev the engine up and check if the noise reduces at the same time the engine speed decreases. If the noise reduces at the same time the engine speed decreases, it is gear noise. If the noise reduces a short time after the engine speed decreases, it is turbocharger noise.

Check whether the noise described by the customer occurs.

Result:
Result
Proceed to
Abnormal noise generated from turbocharger
A
Abnormal noise generated from parts other than turbocharger
B

Go to step 8

A

4.CHECK TURBOCHARGER SUB-ASSEMBLY

Check for damage to the compressor impeller.

Check for interference between the compressor impeller and the compressor housing.

Result:
Result
Proceed to
No damage or interference
A
Damage or interference exists
B

REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F011X.html)

END (CAUSE CHECK EXCEPT THE TURBO CHARGER)

5.CONFIRM NOISE SOURCE (FROM TURBOCHARGER OR NOT)

Connect the GTS to the DLC3.

Start the engine and warm it up.

Turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VN Turbo Open.

Perform the Active Test under the conditions* from the time the noise occurred described by the customer and compare the noise to the noise heard when not performing the Active Test and check if the noise is reduced.
HINT:
*: Some examples of conditions are idling, racing the engine and driving at full throttle.

Result:
Result
Proceed to
The noise is reduced (or disappears)
A
The noise is the same as in Procedure 2 (The noise does not change)
B
HINT:
1. By performing Activate the VN Turbo Open Active Test, the variable nozzle of the turbocharger sub-assembly becomes fully open regardless of the engine condition, and the turbocharger speed does not increase.
2. If the turbocharger sub-assembly is the cause of the noise, the noise will be reduced when Activate the VN Turbo Open Active Test is performed because turbocharger speed does not increase.

Go to step 8

A

6.PERFORM SIMULATION TEST

Check whether the noise described by the customer occurs.
HINT:
If an abnormal noise is heard, check whether it matches the noise described by the customer.

If an abnormal noise is confirmed, determine which system emits it.

Result:
Result	Proceed to
Noise occurs (squealing (metallic sound) when driving)	A
Noise occurs (hissing (airflow sound) when driving)	B
Noise occurs (whistling or foghorn-like (airflow sound) during acceleration)	C
Noise occurs (whistling (airflow sound) during deceleration)	D

Go to step 11

Go to step 16

Go to step 22

D

7.CHECK GEAR NOISE

Check if gear noise is the source of the abnormal noise (not noise from the turbocharger).

ELIMINATE THE CAUSE OF THE NOISE

8.CHECK FOR NOISE FROM SOURCE OTHER THAN TURBOCHARGER (PROCEDURE 8)

Check for the noise source.
CAUTION:
When performing this check, make sure that the sound scope, your body, etc., do not get caught on the V-belt.
HINT:
1. The source of the noise is not the turbocharger sub-assembly, but a part other than the turbocharger sub-assembly (e.g. a part inside the engine, transmission, or vacuum pump).
2. Sometimes gear noise may be mistaken for turbocharger noise. For gear noise, pay attention to the gear inside the engine and transmission gear.
3. Rev the engine up and check if the noise reduces at the same time the engine speed decreases. If the noise reduces at the same time the engine speed decreases, it is gear noise. If the noise reduces a short time after the engine speed decreases, it is turbocharger noise.

NEXT

9.REPLACE THE PARTS DETECTED IN PROCEDURE 8

Replace the parts detected in Procedure 8 as the noise source.

NEXT

10.CONFIRM CONFIRM WHETHER THE NOISE PROBLEM HAS BEEN SUCCESSFULLY SOLVED

Check whether the noise problem has been successfully solved.

END

11.CHECK TURBOCHARGER SUB-ASSEMBLY

Check that the turbine shaft rotates smoothly, without catching (LandCruiser RM000003TBT01XX_01_0005.html).

Check for loose turbine mounting nuts and for axial play in the turbine shaft (LandCruiser RM000003TBT01XX_01_0007.html).
HINT:
If the turbine shaft catches or if there no play or excessive play, it could indicate poor sliding due to seal damage due to seizing or a deposit build-up.
Standard value:
0.10 mm (0.00394 in.) or less

Result:
Result	Proceed to
No turbine shaft malfunction	A
Turbine shaft malfunction	B

REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F011X.html)

A

12.CHECK TURBOCHARGER SUB-ASSEMBLY

Check for damage to the compressor impeller.

Check for interference between the compressor impeller and the compressor housing.

Result:
Result	Proceed to
Damage or interference exists	A
No damage or interference	B

Go to step 15

A

13.REPLACE TURBOCHARGER SUB-ASSEMBLY

Replace the turbocharger sub-assembly (LandCruiser RM000002S6F011X.html).

NEXT

14.PERFORM SIMULATION TEST

Check that the abnormal noise has disappeared.

END

15.CHECK TURBOCHARGER SUB-ASSEMBLY

Check for interference between the turbine wheel and the turbine housing.

Result:
Result	Proceed to
No damage or interference*	A
Damage or interference exists	B

HINT:

Replace the turbocharger sub-assembly, as the abnormal noise may have been caused by interference between the turbine blades and housing.

REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F011X.html)

16.CHECK TURBOCHARGER SUB-ASSEMBLY

Check that no soot or oil adheres to the turbocharger sub-assembly connectors.

HINT:
If adhering soot or an oil leak exists, air leaking at that position may be the cause of the abnormal noise.

Result:
Result	Proceed to
No adhering soot or an oil*	A
Soot adhering around the turbine housing, flange, or V band (A in the illustration)	B
Oil leak from the contact surface between the compressor housing and bearing housing (B in the illustration)	C
Oil adhering to the compressor flange (C in the illustration)	D

HINT:

*: Since abnormal noise may be the result of airflow noise from the blades, replace the turbocharger sub-assembly.

Go to step 19

REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F011X.html)

REPLACE GASKET

A

17.REPLACE TURBOCHARGER SUB-ASSEMBLY

Replace the turbocharger sub-assembly (LandCruiser RM000002S6F011X.html).

NEXT

18.PERFORM SIMULATION TEST

Check that the abnormal noise has disappeared.

END

19.CHECK EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY

Check for deformation or cracks in the mounting surfaces on the exhaust manifold converter subassembly and the turbine with valve housing sub-assembly.
HINT:
Deformation or cracks on a mounting surface may allow exhaust gas to leak from the damaged position.
Standard:
No deformation or cracks on a mounting surface

Result:
Result	Proceed to
No problem with the mounting surface	A
Deformation or cracks on the exhaust manifold converter sub-assembly mounting surface	B
Deformation or cracks on the turbine with valve housing sub-assembly mounting surface	C

REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (LandCruiser RM000005UKF000X.html)

REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F011X.html)

A

20.REPLACE V CLAMP AND GASKET

Replace the V clamp and the gasket.

NEXT

21.PERFORM SIMULATION TEST

Check that the abnormal noise has disappeared.

END

22.CHECK TURBOCHARGER SUB-ASSEMBLY

Check that the turbine shaft rotates smoothly, without catching (LandCruiser RM000003TBT01XX_01_0005.html).

Check for loose turbine mounting nuts and for axial play in the turbine shaft (LandCruiser RM000003TBT01XX_01_0007.html).
HINT:
If the turbine shaft catches or if there no play or excessive play, it could indicate poor sliding due to seal damage due to seizing or a deposit build-up.
Standard value:
0.10 mm (0.00394 in.) or less

Result:
Result	Proceed to
No turbine shaft malfunction	A
Turbine shaft malfunction	B

REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F011X.html)

A

23.CHECK TURBOCHARGER SUB-ASSEMBLY

Check for damage to the compressor impeller.

Check for interference between the compressor impeller and the compressor housing.
HINT:
If the previous checks find no malfunction, replace the turbocharger sub-assembly and determine if the noise improved.

Result:
Result	Proceed to
Damage or interference exists	A
No damage or interference	B

Go to step 26

A

24.REPLACE TURBOCHARGER SUB-ASSEMBLY

Replace the turbocharger sub-assembly (LandCruiser RM000002S6F011X.html).

NEXT

25.PERFORM SIMULATION TEST

Check that the abnormal noise has disappeared.

END

26.CHECK TURBOCHARGER SUB-ASSEMBLY

Check for interference between the turbine wheel and the turbine housing.

Result:
Result	Proceed to
No damage or interference*	A
Damage or interference exists	B

HINT:

Replace the turbocharger sub-assembly, as the abnormal noise may have been caused by loss of rotational balance and deterioration over time.

REPLACE TURBOCHARGER SUB-ASSEMBLY (LandCruiser RM000002S6F011X.html)

Result	Proceed to
Abnormal noise generated from turbocharger	A
Abnormal noise generated from parts other than turbocharger	B

Result	Proceed to
The noise is reduced (or disappears)	A
The noise is the same as in Procedure 2 (The noise does not change)	B