Sfi System Engine Stalls

DESCRIPTION

INSPECTION PROCEDURE

INTERVIEW THE CUSTOMER

CHECK DTC OUTPUT

SYMPTOM CONFIRMATION

READ VALUE USING GTS (ISC LEARNING VALUE)

READ VALUE USING GTS (SHORT FT AND LONG FT)

PERFORM ACTIVE TEST USING GTS (CONTROL THE SELECT CYLINDER FUEL CUT)

PERFORM ACTIVE TEST USING GTS (CHECK THE CYLINDER COMPRESSION)

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME)

CHECK IGNITION SYSTEM

INSPECT OTHER RELATED COMPONENTS

REMOVE FOREIGN OBJECT (CLEAN THROTTLE WITH MOTOR BODY ASSEMBLY)

PERFORM CONFIRMATION DRIVING PATTERN

CHECK CYLINDER COMPRESSION PRESSURE

REPLACE FUEL INJECTOR

READ VALUE USING GTS (MAF)

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

REPLACE AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR

REPLACE FUEL INJECTOR

CHECK INTAKE SYSTEM

PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP / SPEED)

INSPECT FUEL PUMP

INSPECT RELATED PARTS

INSPECT FUEL PUMP CONTROL SYSTEM

INSPECT OTHER RELATED COMPONENTS

REPAIR OR REPLACE MALFUNCTIONING PARTS

CONDUCT CONFIRMATION TEST

SFI SYSTEM - Engine Stalls

DESCRIPTION

Problem Symptom	Suspected Area	Trouble Area
Engine speed fluctuation due to abnormal combustion Idle speed too low or high Strong engine vibration due to above symptoms	Ignition malfunction Deviation in air fuel ratio (Excessive or insufficient intake air volume or fuel supply) Insufficient compression Changes in load from another system	Ignition system	Spark plug Ignition coil assembly
		Fuel system	Fuel injector assembly Fuel pump Fuel pump control circuit Fuel line Purge VSV system Fuel quality (existence of foreign matter, degradation)
		Intake and exhaust systems	Mass air flow meter sub-assembly Intake system (Air leaks or deposit accumulation) Throttle body with motor assembly Air fuel ratio sensor Heated oxygen sensor Camshaft timing oil control assembly Variable Valve Timing system (VVT system) Brake booster assembly
		Other control systems	ECM Wire harness or connector Knock control sensor Engine coolant temperature sensor
		Engine	Thermostat Engine assembly Engine mount
		High load from another system	Air conditioning system Power steering system Electrical load signal system

HINT:

1. If any other DTCs are output, perform troubleshooting for those DTCs first.
   
2. Make sure to reproduce the conditions present when the malfunction occurred.
   
3. Using the GTS, read the Data List to confirm the engine operating conditions. This information can be useful when troubleshooting.
   
4. If the problem symptoms do not recur, attempt to reproduce the symptoms and conditions when the malfunction occurred based on the result of the customer problem analysis. Place the priority on confirming the symptoms.
   

SYMPTOM AND CAUSE OF SYSTEM MALFUNCTION

HINT:

The following are descriptions of the characteristics of each system malfunction. After understanding the link between the causes and symptoms, perform the inspection of each component. Even if the problem symptom does not recur, signs of the malfunction may be found in the Data List.

1. Ignition system
   
   

   Spark plug

   Main cause of malfunction	Performance degradation (wear, existence of foreign matter, etc.)
   Symptom	Engine speed fluctuation due to abnormal combustion
   Data List	Cylinder Misfire Count
   HINT: If the spark plug of the malfunctioning cylinder is abnormally wet with fuel, a leaking fuel injector assembly is suspected.

   
   

   Ignition coil assembly

   Main cause of malfunction	Internal malfunction
   Problem symptom	Engine speed fluctuation due to abnormal combustion
   Data List	Cylinder Misfire Count

2. Fuel system
   
   

   Fuel injector assembly

   Main cause of malfunction	Blockage
   Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high
   Data List	Short FT Long FT Fuel System Status Target Air-Fuel Ratio AF Lambda A/F Learn Value Idle A/F Learn Value Low A/F Learn Value Mid1 A/F Learn Value Mid2 A/F Learn Value High Total FT
   HINT: If the engine malfunction disappears when the fuel injection volume is increased or decreased using the Control the Injection Volume, the respective cylinder may be malfunctioning.

   
   

   Purge VSV

   Main cause of malfunction	Purge VSV stuck open
   Symptom	Engine speed fluctuation due to abnormal combustion
   Data List	EVAP (Purge) VSV Evap Purge Flow Purge Density Learn Value EVAP Purge VSV Purge Cut VSV Duty

   
   

   Fuel system

   HINT: If the air fuel ratio becomes lean only when the engine is running under a high load and at a high engine speed, clogging of the fuel pump or fuel filter is suspected.

   
   

   Fuel quality

   Main cause of malfunction	Fuel degradation due to age or water contamination Low fuel quality Addition of fuel additive
   Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high Engine is difficult to start

3. Intake and exhaust systems
   
   

   Mass air flow meter sub-assembly

   Main cause of malfunction	Performance degradation (existence of foreign matter, etc.)
   Problem symptom	Lack of power
   Data List	MAF
   HINT: If the value of the Data List item "MAF" is abnormal, a malfunction of the mass air flow meter subassembly is suspected.

   
   

   Throttle system

   Main cause of malfunction	Inappropriate trim volume adjustment due to accumulation of deposits
   Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high
   Data List	ISC Learning Value ISC Flow ISC Feedback Value Electric Load Feedback Val Air Conditioner FB Val Eng Stall Control FB Flow

   
   

   Air fuel ratio sensor, Heated oxygen sensor

   Main cause of malfunction	Deviation in sensor characteristics
   Problem symptom	Abnormal combustion due to deviation of actual air fuel ratio from calculated ratio
   Data List	AFS Voltage O2S Fuel System Status

4. Engine
   
   

   Engine assembly

   Main cause of malfunction	Compression loss Accumulation of deposits (Combustion chamber, intake valve or intake manifold)
   Problem symptom	Engine speed fluctuation due to abnormal combustion Idle speed too low or high Hesitation during acceleration or stalling
   Data List	Compression Leakage Count Rough Idle Status Plural Cylinders Rough Idle Rough Idle
   HINT: If deposits have accumulated in the combustion chamber or on an intake valve, the engine may stall when deposits are caught on an intake valve. When performing the Active Test "Check the Cylinder Compression", if the speed of one cylinder is higher than the others, the cylinder may have a compression loss. If deposits accumulate on the intake valves, the supply of fuel may be delayed due to adherence of the fuel to the deposits, causing a rough idle.

   
   

   VVT

   Main cause of malfunction	Camshaft timing oil control valve assembly stuck open
   Symptom	Abnormal combustion due to excessive valve overlap
   Data List	VVT Control Status #1 VVT Advance Fail VVT Aim Angle #1 VVT Change Angle #1 VVT OCV Duty #1 VVT Ex Hold Lrn Val #1 VVT Ex Chg Angle #1 VVT Ex OCV Duty #1

Data List Items Related to Engine Stalls

HINT:

Depending on the vehicle model, the applicable Data List items may vary. Data List items other than the ones used in the diagnostic procedure are for reference only.

1. Compression Leakage Count
   
2. Rough Idle Status
   
3. Plural Cylinders Rough Idle
   
4. Rough Idle
   
5. ISC Learning Value
   
6. ISC Flow
   
7. ISC Feedback Value
   
8. Electric Load Feedback Val
   
9. Air Conditioner FB Val
   
10. Eng Stall Control FB Flow
    
11. Short FT
    
12. Long FT
    
13. Fuel System Status
    
14. Target Air-Fuel Ratio
    
15. AF Lambda
    
16. A/F Learn Value Idle
    
17. A/F Learn Value Low
    
18. A/F Learn Value Mid1
    
19. A/F Learn Value Mid2
    
20. A/F Learn Value High
    
21. Total FT
    
22. MAF
    
23. Cylinder Misfire Count
    
24. AFS Voltage
    
25. O2S
    
26. Engine Speed
    
27. SPD (NT)
    
28. Shift SW Status (D Range)
    
29. VVT Control Status #1
    
30. VVT Advance Fail
    
31. VVT Aim Angle #1
    
32. VVT Change Angle #1
    
33. VVT OCV Duty #1
    
34. VVT Ex Hold Lrn Val #1
    
35. VVT Ex Chg Angle #1
    
36. VVT Ex OCV Duty #1
    

INSPECTION PROCEDURE

1.INTERVIEW THE CUSTOMER

1. Interview the customer for details about the conditions when the engine stalled.
   

   HINT:

   1. Use any information from the customer problem analysis about the conditions of the vehicle when the malfunction occurred (how the engine stalled, conditions when the engine was restarted, etc.)
      
   2. Depending on the conditions when the engine stalled, a malfunction in one of the following areas is suspected.
      
   
   

   Symptom	Suspected Area
   Engine vibration occurs and engine stalls	Abnormal mass air flow meter sub-assembly output due to existence of foreign matter Abnormal air fuel ratio due to malfunction of air fuel ratio sensor or heated oxygen sensor, air leaks in intake system or insufficient fuel supply
   Engine stalls without vibration	Ignition stoppage, fuel injection stoppage or high load from another system
   Engine can be started with accelerator pedal depressed	Insufficient air volume
   Engine stalls or is difficult to start immediately after engine stalled, regardless of whether engine is cold or warm	Deposits in intake system or combustion chamber caught temporarily on intake or exhaust valve

NEXT

2.CHECK DTC OUTPUT

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Perform a road test.
   

5. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
   

6. Read the DTCs.
   
   

   Result:

   
   

   Result	Proceed to
   DTCs are not output	A
   DTC is output (DTCs other than P1603, P1604 or P1605 are output)	B

B	GO TO DTC CHART (LandCruiser RM000000VNN00FX.html)

A

3.SYMPTOM CONFIRMATION

1. Check if the problem symptoms reported in the customer problem analysis recur.
   

   HINT:

   If the problem symptoms do not recur, attempt to reproduce the conditions when the malfunction occurred based on the result of the customer problem analysis.

Result:

Result	Proceed to
The problem symptom recurs	A
The problem symptom does not recur (occurred in the past)	B

B	CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000000VNL00AX.html)

A

4.READ VALUE USING GTS (ISC LEARNING VALUE)

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / ISC Learning Value.
   

5. Read the value displayed on the GTS.
   
   

   Result:

   
   

   Result	Proceed to
   Less than 6.2 L/s	A
   Other than above	B

B	Go to step 11

A

5.READ VALUE USING GTS (SHORT FT AND LONG FT)

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Short FT and Long FT.
   

5. Read the value displayed on the GTS.
   
   

   Result:

   
   

   Data List	Result	Proceed to
   Short FT + Long FT	-15% or higher, or less than 15%	A
   	Other than above	B

   HINT:

   1. "Total FT" is used to detect an abnormal air fuel ratio. As the value of "Total FT" is corrected by the ECM before it is displayed in the Data List, the displayed value may not be equal to the sum of the measured "Short FT" and "Long FT".
      
   2. An abnormally lean or rich tendency can be checked by reading the following Data List items: A/F Learn Value Idle, A/F Learn Value Low, A/F Learn Value Mid1, A/F Learn Value Mid2 and A/F Learn Value High. (For vehicles equipped with a V type engine, check that both banks have the same correction tendency.) If the correction of either bank is -15% or less or +15% or more, the air fuel ratio sensor or heated oxygen sensor of that bank may be malfunctioning.
      
   3. The following may cause a lean air fuel ratio (an operating range in which the air fuel ratio learned value correction is +15% or more):
      
   1. Decrease in fuel injector assembly injection volume
      
   2. Decrease in mass air flow meter sub-assembly output (due to existence of foreign matter)
      
   3. Air leaks in intake system after mass air flow meter sub-assembly
      
   4. Decrease in fuel pressure (at fuel filter, fuel pump or fuel pressure regulator assembly)
      
   4. On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value High" only is corrected to the positive side, a malfunction in the fuel system (clogging of the fuel pump or fuel filter) is suspected.
      
   5. The following may cause a rich air fuel ratio (an operating range in which the air fuel ratio learned value correction is -15% or less):
      
   1. Increase in the fuel injector assembly injection volume
      
   2. Purge VSV system
      

B	Go to step 15

A

6.PERFORM ACTIVE TEST USING GTS (CONTROL THE SELECT CYLINDER FUEL CUT)

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Start the engine.
   

   HINT:

   Reproduce the vehicle conditions when the malfunction occurred. (such as after the engine is warmed up or after a cold start).

5. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Select Cylinder Fuel Cut / Primary / Engine Speed.
   

6. According to the display on the GTS, perform the Active Test and check for a malfunctioning cylinder.
   

   HINT:

   1. Perform fuel-cut for each cylinder and check the change in the engine speed.
      
   2. If the engine speed of a cylinder does not change while performing the Active Test, it can be determined that the cylinder is malfunctioning.
      
   3. If the engine speed of all cylinders change while performing the Active Test, it can be determined that multiple cylinders are malfunctioning.
      
   4. A cylinder for which the Data List item "Cylinder Misfire Count" increases may be malfunctioning.
      
   5. If "Compression Leakage Count" in the Data List increases, misfiring due to insufficient compression may be occurring.
      
   
   

   Result:

   
   

   Result	Proceed to
   One cylinder is malfunctioning	A
   Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined.	B

B	Go to step 15

A

7.PERFORM ACTIVE TEST USING GTS (CHECK THE CYLINDER COMPRESSION)

HINT:

If the vehicle does not support the Active Test "Check the Cylinder Compression", measure the compression pressure. If the compression pressure is normal, go to step 8.

1. Warm up the engine.
   

2. Turn the ignition switch off.
   

3. Connect the GTS to the DLC3.
   

4. Turn the ignition switch to ON.
   

5. Turn the GTS on.
   

6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Check the Cylinder Compression.
   

   HINT:

   To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.

7. While the engine is not running, press the RIGHT or LEFT button to change Check the Cylinder Compression to ON.
   

   HINT:

   After performing the above procedure, Check the Cylinder Compression will start. Fuel injection for all cylinders is prohibited and each cylinder engine speed measurement enters standby mode.

8. Crank the engine for about 10 seconds.
   

9. Monitor the engine speed (Engine Speed of Cyl and Av Engine Speed of All Cyl) displayed on the GTS.
   

   HINT:

   At first, the GTS displays extremely high cylinder engine speed values. After approximately 10 seconds of engine cranking, each cylinder engine speed measurement will change to the actual engine speed.

   NOTICE:

   1. Do not crank the engine continuously for 20 seconds or more.
      
   2. If it is necessary to crank the engine again after Check the Cylinder Compression has been changed to ON and the engine has been cranked once, press Exit to return to the Active Test menu screen. Then change Check the Cylinder Compression to ON and crank the engine.
      
   3. Use a fully-charged battery.
      

10. Stop cranking the engine, and then change "Check the Cylinder Compression" to OFF after the engine stops.
    

    NOTICE:

    1. If the Active Test is changed to OFF while the engine is being cranked, the engine will start.
       
    2. When performing the Active Test, DTC P1604 (Startability Malfunction) may be stored.
       
    3. After performing the Active Test, make sure to check and clear DTCs.
       

11. Read the value.
    

    HINT:

    1. If the value of Data List item "Engine Speed of Cyl" of a cylinder is higher than other cylinders, the cylinder may be malfunctioning.
       
    2. If the value of Data List item "Engine Speed of Cyl" is high for only one cylinder, compression loss is suspected.
       
    
    

    Result:

    
    

    Result	Proceed to
    There is no variation in "Engine Speed of Cyl" (All cylinders display approximately the same value for "Engine Speed of Cyl")	A
    There is variation in "Engine Speed of Cyl" (Only one cylinder displays a value for "Engine Speed of Cyl" that differs considerably)	B

B	Go to step 13

A

8.PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME)

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.
   

5. Idle the engine.
   

6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume.
   

7. According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.
   

   HINT:

   Change the fuel injection volume between the minimum and maximum range of correction (e.g. -12.5% to 12.5%).

   
   

   Result:

   
   

   Result	Proceed to
   Malfunction is still present even if the fuel injection volume is changed	A
   Malfunction disappears when the fuel injection volume is changed	B

B	Go to step 14

A

9.CHECK IGNITION SYSTEM

1. Check the ignition system.
   

   HINT:

   1. Interchange the ignition coil assembly and spark plug of the malfunctioning cylinder with those of a known good cylinder and check if the malfunctioning cylinder returns to normal.
      
   2. If the spark plug of the malfunctioning cylinder is abnormally wet with fuel even after the ignition coil assembly and spark plug are replaced, a leaking fuel injector assembly is suspected.
      
   
   

   Result:

   
   

   Result	Proceed to
   The malfunctioning cylinder does not return to normal	A
   The malfunctioning cylinder returned to normal	B

B	Go to step 25

A

10.INSPECT OTHER RELATED COMPONENTS

1. Check the ignition coil assembly power source circuit, wire harness and connectors.
   

NEXT	Go to step 25

11.REMOVE FOREIGN OBJECT (CLEAN THROTTLE WITH MOTOR BODY ASSEMBLY)

1. Clean off any deposits from the inside of the throttle body with motor assembly.
   

2. Push open the throttle valve and wipe off any carbon from the valve and bore using a piece of cloth soaked in non-residue solvent.
   

   
   
   
   
   

   Text in Illustration

   *1	Throttle Body with Motor Assembly	*2	Bore
   *3	Valve	-	-
   *a	Reference	*b	Throttle Body with Motor Assembly Cross-section Diagram
   *c	When valve fully opened	*d	Do not directly apply cleaner
   *e	Deposits	-	-

   NOTICE:

   1. Make sure that the cloth or your fingers do not get caught in the valve.
      
   2. Make sure that foreign matter does not enter the throttle valve.
      
   3. Do not directly apply non-residue solvent to the throttle body or wash the throttle body. Cleaning solvent may leak into the motor from the shaft and cause problems such as rust or valve movement problems.
      
   4. If there is coating material on the edge of the valve, be careful not to remove it.
      

HINT:

The illustrations are for reference only. Actual parts may differ.

NEXT

12.PERFORM CONFIRMATION DRIVING PATTERN

1. Perform "Inspection After Repair" after cleaning the throttle body with motor assembly (LandCruiser RM000004NJC03XX.html).
   

2. Connect the GTS to the DLC3.
   

3. Turn the ignition switch to ON.
   

4. Turn the GTS on.
   

5. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.
   

6. Allow the engine to idle for 3 minutes or more and confirm that the engine speed is within the specified range.
   

   HINT:

   If the engine is operated without performing learning value reset and idle learning after cleaning the deposits from the throttle body with motor assembly, the idle speed may increase.

NEXT	Go to step 26

13.CHECK CYLINDER COMPRESSION PRESSURE

1. Measure the cylinder compression pressure. If the compression pressure of a cylinder is low, inspect the engine assembly and repair or replace parts as necessary (LandCruiser RM000002ZLZ06TX_01_0010.html).
   

   HINT:

   Perform "Inspection After Repair" after replacing the engine assembly (LandCruiser RM000004NJC03XX.html).

NEXT	Go to step 26

14.REPLACE FUEL INJECTOR

1. Replace the fuel injector assembly of the malfunctioning cylinder (LandCruiser RM000000Q480CIX.html).
   

   HINT:

   1. If the air fuel ratio learned value is corrected to the positive side for all operating ranges due to low fuel injector assembly injection volume, replace the fuel injector assemblies of all cylinders.
      
   2. Perform "Inspection After Repair" after replacing the fuel injector assembly (LandCruiser RM000004NJC03XX.html).
      

NEXT	Go to step 26

15.READ VALUE USING GTS (MAF)

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.
   

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

6. According to the display on the GTS, read the Data List when the ignition switch is turned to ON and while maintaining an engine speed of 3000 rpm.
   
   

   Result:

   
   

   Result	Proceed to
   Other than below	A
   Ignition switch ON (engine stopped): 1 gm/sec or higher Engine speed 3000 rpm (without load): Less than 7.6 gm/sec	B

B	Go to step 19

A

16.PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Start the engine and warm it up until the engine coolant temperature 75°C (167°F) or higher with all the accessories switched off.
   

5. Warm up the air fuel ratio sensor at an engine speed of 2500 rpm for 90 seconds.
   

6. Idle the engine.
   

7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume for A/F Sensor / Primary / AFS Voltage B1S1 and O2S B1S2.
   

8. According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.
   

   NOTICE:

   1. The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.
      
   2. Read the output voltage immediately after warming up the air fuel ratio sensor and heated oxygen sensor to avoid an inaccurate reading due to a sensor cooling.
      

   HINT:

   The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.

   
   

   Result:

   GTS Display (Sensor)	Injection Volume	Voltage
   AFS Voltage B1S1 (Air fuel ratio)	12.5%	Below 3.1 V
   	-12.5%	Higher than 3.4 V
   O2S B1S2 (Heated oxygen)	12.5%	Higher than 0.55 V
   	-12.5%	Below 0.4 V

   
   

   Result:

   
   

   Result	Proceed to
   Output voltage values are abnormal	A
   Malfunction disappears when fuel injection volume is increased	B
   Malfunction is still present when fuel injection volume is increased, even if output voltage values are normal	C

B	Go to step 18
C	Go to step 20

A

17.REPLACE AIR FUEL RATIO SENSOR AND HEATED OXYGEN SENSOR

1. Replace the air fuel ratio sensor (LandCruiser RM00000175900NX.html).
   

   HINT:

   Perform "Inspection After Repair" after replacing the air fuel ratio sensor (LandCruiser RM000004NJC03XX.html).

2. Replace the heated oxygen sensor (LandCruiser RM00000175F00UX.html).
   

NEXT	Go to step 26

18.REPLACE FUEL INJECTOR

1. Replace the fuel injector assemblies of all cylinders (LandCruiser RM000000Q480CIX.html).
   

   HINT:

   Perform "Inspection After Repair" after replacing the fuel injector assembly (LandCruiser RM000004NJC03XX.html).

NEXT	Go to step 26

19.CHECK INTAKE SYSTEM

1. Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.
   

   HINT:

   1. If there is foreign matter in the intake system components, remove it before proceeding to the next step.
      
   2. If there is no foreign matter in the intake system components, check for foreign matter in the mass air flow meter sub-assembly. If there is foreign matter in the mass air flow meter sub-assembly, remove it.
      
   3. Perform "Inspection After Repair" after repairing or replacing the intake system (LandCruiser RM000004NJC03XX.html).
      

NEXT	Go to step 26

20.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP / SPEED)

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
   

5. When performing the Active Test, check for an operating sound from the fuel pump.
   
   

   OK:

   
   

   Control the Fuel Pump / Speed	Specified Condition
   ON	Operating sound heard
   OFF	Operating sound not heard

   
   

   Result:

   Result	Proceed to
   Normal	A
   Abnormal	B

B	Go to step 23

A

21.INSPECT FUEL PUMP

1. Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine (LandCruiser RM000000Q3M06EX_01_0002.html).
   
   

   Standard:

   
   

   Vehicle State	Specified Condition
   Cranking engine	304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 50 psi)
   5 minutes after stopping engine	147 kPa (1.5 kgf/cm2, 21 psi) or higher

   HINT:

   1. If there is foreign matter such as iron particles on the fuel pump, remove it.
      
   2. Make sure that there are no leaks from the fuel lines, signs of fuel leakage or fuel odors.
      
   
   

   Result:

   
   

   Result	Proceed to
   Abnormal	A
   Normal	B

B	Go to step 24

A

Go to step 23

22.INSPECT RELATED PARTS

1. Inspect the following fuel pump related parts:
   

   1. Fuel pump
      
   2. Fuel pressure regulator assembly
      
   3. Fuel lines and connecting parts
      
   4. Fuel filter
      

NEXT	Go to step 25

23.INSPECT FUEL PUMP CONTROL SYSTEM

1. Inspect the fuel pump control system.
   

NEXT	Go to step 25

24.INSPECT OTHER RELATED COMPONENTS

1. Inspect other related components.
   

   HINT:

   If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.

   1. Engine mount deterioration
      
   2. Deposits in the intake manifold or on an intake valve
      
   3. Delay in fuel supply due to adherence of the fuel to the deposits
      

NEXT

25.REPAIR OR REPLACE MALFUNCTIONING PARTS

1. Repair or replace the malfunctioning part.
   

2. Perform "Inspection After Repair" after repairing or replacing the malfunctioning part (LandCruiser RM000004NJC03XX.html).
   

NEXT

26.CONDUCT CONFIRMATION TEST

1. Check that the idle has returned to normal.
   

NEXT
END