DESCRIPTION
Malfunction Condition | Main Trouble Area | Related Trouble Area |
---|---|---|
|
(a) Injector assembly malfunctions
(b) Abnormal common rail pressure
(c) Abnormal intake air volume
|
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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. Hidden factors of the malfunction are possible.
Check that the vehicle has not been modified in any way prior to the vehicle inspection.
This troubleshooting procedure checks for the cause of an obvious lack of engine power while the vehicle is being driven (such as the maximum speed being extremely low).
Faults and Symptoms of Common Rail Diesel Components
Engine Control
Main fault | Decrease in performance (foreign matter is attached) |
Symptoms | Lack of power, black smoke |
Data List | MAF |
Tip:
The maximum fuel injection volume is controlled according to the output from the mass air flow meter assembly. |
Symptom and Corresponding Main Fault |
|
Data List |
|
Main fault |
|
Symptoms |
Lack of power (when vehicle is starting, under heavy load) (Black smoke is not emitted when racing the engine while the vehicle is stopped) |
Data List |
MAP, Target Booster Pressure
|
Main fault | Blockage |
Symptoms | Lack of power (high engine speed, under heavy load) |
Data List |
MAP, Target Booster Pressure When the accelerator is fully depressed, if MAP is 20 kPa lower than Target Booster Pressure for more than 5 seconds, then a lack of power will be felt. |
Main fault | Glow system malfunction |
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 assembly |
Main fault | Damaged, seized up |
Symptoms | Cannot crank, crank speed is low, strange noise |
Main fault | Loss of compression |
Symptoms | Rough idle (lack of power always) |
Data List |
Engine Speed of Cyl
Injection Feedback Val
|
Common Rail (ALL)
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
Tip:
|
Diagnostic Trouble Code | Even if Fuel Press is below Target Common Rail Pressure, a DTC will not be stored. |
Main fault | Blockage |
Symptoms | Difficult to start, engine stalling, rough idle, lack of power |
Data List |
Fuel Press, Target Common Rail Pressure
Tip:
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. |
Main fault | Blockage |
Symptoms | Rough idle, lack of power, black smoke, white smoke, knocking |
Data List |
Injection Feedback Val
|
Main fault | Circuit fault: The 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 (EDU) has a fault, some DTCs may be stored. |
Main fault | Open circuit, decrease in performance (foreign matter is attached) |
Symptoms | Difficult to start, rough idle, engine stall, lack of power |
Data List |
Fuel Press, Target Common Rail Pressure
|
Diagnostic Trouble Code | When the fuel pressure sensor has a fault, some DTCs may be stored. |
Main fault | - |
Symptoms | Difficult to start, rough idle (especially when cold) |
Diesel EGR
Main fault |
|
Symptoms |
|
Data List |
Actual EGR Valve Pos., Target EGR Position
EGR Close Lrn. Val., EGR Close Lrn. Status
|
Diesel Throttle
Main fault | Stuck, does not move smoothly |
Symptoms |
|
Data List |
Actual Throttle Position
|
Data List Related to Starting Trouble
Engine Speed
MAP
MAF
Intake Air
Coolant Temp
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.
CAUTION / NOTICE / HINT
Explanation of Symptom
Lack of Power |
The power of the diesel engine is determined by the quantity of injected fuel and the quantity of intake air. The quantity of injected fuel is determined by the fuel pressure and the amount of time the injector assembly is open. Basically, the fuel pressure is controlled so that it reaches the target fuel pressure. The throttle valve does not restrict air flow volume, so the manifold absolute pressure is almost the same as atmospheric pressure when idling. At more than approximately 1500 rpm, the turbo starts to operate causing the manifold absolute pressure to become higher than atmospheric pressure. The manifold absolute pressure is controlled so that it reaches the Target Booster Pressure when accelerating the vehicle at full throttle. Also, when accelerating the vehicle at full throttle, the throttle is fully open and the EGR valve is fully closed, preserving the mass air flow. |
After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click hereНажмите здесь).
After replacing the suction control valve, the ECM needs initialization.
Click hereНажмите здесь
After replacing an injector assembly, the ECM needs registration.
Click hereНажмите здесь
After replacing the exhaust manifold converter sub-assembly (DPF catalyst), clear the thermal deterioration data stored in the ECM.
Click hereНажмите здесь
PROCEDURE
READ OUTPUT DTC (RELATING TO ENGINE)
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the pending DTCs.
Powertrain > Engine and ECT > Trouble CodesResult | ||||||
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|
If only DTC P1608 is output, proceed to procedure 2.
B |
GO TO DTC CHART Click here Нажмите здесь |
A |
TAKE SNAPSHOT DURING IDLING AND 4000 RPM (PROCEDURE 2)
Connect the GTS to the DLC3.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Diesel Lack of Power.
With no load after the engine is warmed up, take a snapshot when idling and at 4000 rpm.
A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting.
The shift lever should be in neutral and the A/C switch and all accessory switches should be off.
Result | ||
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|
NEXT |
TAKE SNAPSHOT DURING LACK OF POWER (PROCEDURE 3)
Connect the GTS to the DLC3.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data.
Check for a lack of power during the driving test.
A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting.
Move the shift lever to 2nd gear and accelerate the vehicle with the accelerator pedal fully depressed (obey all laws and regulations, and pay attention to traffic conditions while driving the vehicle). Then, check the Data List with the engine warmed up and idling (the shift lever should be in neutral and the A/C switch and all accessory switches should be off).
Result | ||||||
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B | Нажмите здесь |
A |
CHECK SNAPSHOT (MAP AND MAF)
Check MAP and MAF in the snapshot taken in procedure 2 when the engine was running at 4000 rpm with no load.
Result | ||||||||
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The above values were measured under standard atmospheric pressure. The values are influenced by elevation, weather conditions, etc.
Standard atmospheric pressure is 101 kPa. For every 100 m increase in elevation, pressure drops by 1 kPa. This varies by weather.
*1: There may be a problem in the fuel injection system or intake system.
*2: There may be a problem in the turbocharger system.
*3: There may be a problem in the intake system or a problem with the EGR valve (valve stuck open or valve does not close).
B | Нажмите здесь |
C | Нажмите здесь |
A |
CHECK SNAPSHOT (FUEL PRESS, TARGET COMMON RAIL PRESSURE, MAP AND TARGET BOOSTER PRESSURE)
Check Fuel Press, Target Common Rail Pressure, MAP and Target Booster Pressure in the snapshot taken in procedure 3 when the vehicle was accelerating with the accelerator pedal fully depressed in 2nd gear.
Result | ||||||||
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The above values were measured under standard atmospheric pressure. The values are influenced by elevation, weather conditions, etc.
Standard atmospheric pressure is 101 kPa. For every 100 m increase in elevation, pressure drops by 1 kPa. This varies by weather.
The engine speed must be 1500 rpm or less before performing the inspection in which the accelerator pedal is fully depressed and the engine is accelerated to a speed of 3000 rpm.
If the turbocharger sub-assembly movement is not smooth, etc., the value of MAP in the snapshot taken during lack of power will not reach the target value.
When the accelerator pedal is fully depressed and the engine speed is 3000 rpm, the MAP should be higher than 160 kPa.
B | Нажмите здесь |
C | Нажмите здесь |
GO TO STEP 27 |
A |
CHECK INTAKE SYSTEM
Check for air leaks and blockages between the air cleaner case sub-assembly and turbocharger sub-assembly, and between the turbocharger sub-assembly and intake manifold.
Inspect the intake system, especially hoses and pipes between the air cleaner case sub-assembly and turbocharger sub-assembly.
Check for abnormal disconnections, pipe and hose squashing, and any damage in the intake system.
Using your hand, check whether the pipes and hoses in the intake system are securely connected.
By applying soapy water and revving up the engine, air leaks from the intake system can be checked by checking for bubbles.
Check for any modifications in the intake system made by the user.
OK |
---|
No leakage or blockage. |
Result | |||
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|
NG | Нажмите здесь |
OK |
REPLACE FUEL FILTER ELEMENT SUB-ASSEMBLY
Replace the fuel filter element sub-assembly.
Click hereНажмите здесь
Result | ||
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|
NEXT |
REPLACE INJECTOR ASSEMBLIES OF ALL CYLINDERS
Replace the injector assemblies.
Click here Нажмите здесь
When replacing the injector assembly for a cylinder, always be sure to use a new injection pipe.
Follow the procedure in the repair manual and temporarily install the injection pipes and nozzle leakage pipe, and then correctly position the injector assemblies. After that, tighten parts according to the torque specifications.
If the installation procedure is not performed correctly, injector assemblies may become out of position, which may cause the injector assemblies to deteriorate, resulting in malfunctions.
If an injector assembly deteriorates and malfunctions, other problems such as knocking, rough idle, etc. may occur.
If an injector assembly becomes out of position, it is possible that the seal between the injector assembly and injection pipe may become incomplete, resulting in a fuel leak.
Result | ||
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|
NEXT |
BLEED AIR FROM FUEL SYSTEM
Bleed the air from the fuel system.
Click hereНажмите здесь
Result | ||
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|
NEXT |
REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING
Register the injector compensation codes.
Click hereНажмите здесь
Perform the injector pilot quantity learning.
Click hereНажмите здесь
Result | ||
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|
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Result | ||
---|---|---|
|
NEXT |
END |
REPAIR OR REPLACE INTAKE SYSTEM
Repair or replace the malfunctioning part in the intake system.
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 24 |
INSPECT CLOGGED FUEL PIPE
Connect the GTS to the DLC3.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Common Rail (ALL).
With no load after the engine is warmed up, take a snapshot when idling and vehicle was accelerating with the accelerator pedal fully depressed in 2nd gear.
Check the Target Common Rail Pressure and Fuel Press value.
Result | |||||||
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|
*1: The cause may be a squashed or blocked fuel pipe or hose.
*2: The cause may be a clogged fuel filter element sub-assembly.
B | Нажмите здесь |
A |
REPAIR OR REPLACE CLOGGED FUEL LINE
Repair or replace the clogged (including frozen fuel) fuel pipe.
Replace the fuel filter element sub-assembly.
Click hereНажмите здесь
If "Fuel Press" does not follow "Target Common Rail Pressure" when the accelerator pedal is fully depressed in 2nd gear, replace the fuel filter element sub-assembly.
Result | ||
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|
NEXT |
BLEED AIR FROM FUEL SYSTEM
Bleed the air from the fuel system.
Click hereНажмите здесь
Result | ||
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|
NEXT |
PERFORM SUPPLY PUMP INITIALIZATION
Perform the supply pump initialization.
Click hereНажмите здесь
Result | ||
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|
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Connect the GTS to the DLC3.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Test the Fuel Leak / All Data / Fuel Press and Target Common Rail Pressure.
Powertrain > Engine and ECT > Active TestActive Test Display |
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Test the Fuel Leak |
Data List Display |
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Target Common Rail Pressure |
Fuel Press |
Take a snapshot with the GTS during the Active Test.
Measure the difference between the target fuel pressure (Target Common Rail Pressure) and the actual fuel pressure (Fuel Press) when the "Test the Fuel Leak" Active Test is performed.
In order to obtain an exact measurement, perform the Active Test 5 times and measure the difference once each time the Active Test is performed.
OK |
---|
The difference between the target fuel pressure and the actual fuel pressure 2 seconds after the Active Test starts is less than 10000 kPa. |
"Target Common Rail Pressure" is the target fuel pressure controlled by the ECM.
"Fuel Press" is the actual fuel pressure.
Result | ||
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|
NEXT |
END |
REPLACE SUCTION CONTROL VALVE
Replace the suction control valve.
Click hereНажмите здесь
Result | ||
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|
NEXT | Нажмите здесь |
GO TO STEP 15 |
READ VALUE USING GTS (MAP AND ATMOSPHERIC PRESSURE)
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAP and Atmosphere Pressure.
Powertrain > Engine and ECT > Data ListTester Display |
---|
Atmosphere Pressure |
MAP |
Compare MAP to Atmosphere Pressure when the ignition switch ON (do not start the engine).
Standard |
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Difference between MAP and Atmosphere Pressure is less than 8 kPa. |
If MAP and Atmosphere Pressure have the same value, both are normal. If there is a difference of 8 kPa or higher, compare the values to the atmospheric pressure for that day. The sensor whose deviation is the greatest is malfunctioning.
Standard atmospheric pressure is 101 kPa. For every 100 m increase in elevation, pressure drops by 1 kPa. This varies by weather.
Result | ||||||||
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|
B | Нажмите здесь |
C | Нажмите здесь |
A |
CHECK INTAKE SYSTEM
Check for air leaks and blockages between the air cleaner case sub-assembly and turbocharger sub-assembly, and between the turbocharger sub-assembly and intake manifold.
Result | ||||||
---|---|---|---|---|---|---|
|
Inspect the intake system, especially hoses and pipes between the air cleaner case sub-assembly and turbocharger sub-assembly.
Check for abnormal disconnections, pipe and hose squashing, and any damage in the intake system.
Using your hand, check whether the pipes and hoses in the intake system are securely connected.
When inspecting for a clogged intake system (cause of low MAP), check the following points:
Clogged air cleaner filter element sub-assembly
Clogged intake hose
Diesel throttle valve stuck in closed position
Check for any modifications in the intake system made by the user.
A | Нажмите здесь |
GO TO STEP 12 |
B |
INSPECT TURBOCHARGER SUB-ASSEMBLY
Inspect the turbocharger sub-assembly.
Click hereНажмите здесь
Result | |||
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|
NG | Нажмите здесь |
OK |
CHECK FOR INTERMITTENT PROBLEMS
Check for intermittent problems.
Click hereНажмите здесь
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 24 |
REPLACE TURBOCHARGER SUB-ASSEMBLY
Replace the turbocharger sub-assembly.
Click hereНажмите здесь
Result | ||
---|---|---|
|
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Result | ||
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|
NEXT |
END |
REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR
Replace the manifold absolute pressure sensor.
Click hereНажмите здесь
Result | ||
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|
NEXT | Нажмите здесь |
GO TO STEP 24 |
REPLACE ECM
Replace the ECM.
Click hereНажмите здесь
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 24 |
CHECK INTAKE SYSTEM
Check for air leaks and blockages between the air cleaner case sub-assembly and turbocharger sub-assembly, and between the turbocharger sub-assembly and intake manifold.
Result | ||||||
---|---|---|---|---|---|---|
|
Inspect the intake system, especially hoses and pipes between the air cleaner case sub-assembly and turbocharger sub-assembly.
Check for abnormal disconnections, pipe and hose squashing, and any damage in the intake system.
Using your hand, check whether the pipes and hoses in the intake system are securely connected.
By applying soapy water and revving up the engine, air leaks from the intake system can be checked by checking for bubbles.
Make sure that the hose between the manifold absolute pressure sensor and intake manifold is not loose or disconnected.
Check for any modifications in the intake system made by the user.
B | Нажмите здесь |
A |
PERFORM ACTIVE TEST USING GTS (ACTIVATE THE EGR VALVE CLOSE)
Connect the GTS 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 and wait for 30 seconds.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF.
Powertrain > Engine and ECT > Data ListTester Display |
---|
MAF |
Read the MAF value displayed on the GTS while the engine is idling.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the EGR Valve Close / All Data / MAF.
Powertrain > Engine and ECT > Active TestActive Test Display |
---|
Activate the EGR Valve Close |
Data List Display |
---|
MAF |
Read the MAF value when the EGR valve is closed using the Active Test function.
If idling continues for 20 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 restart the engine.
Before performing diagnosis, confirm that the EGR valve target opening angle is not 0%.
When "Coolant Temp" is 75°C (167°F) or higher during idle, the exhaust gas flows through the EGR pipe with cooler sub-assembly. If MAF does not change when the EGR is cut even though the EGR valve is operating normally, the EGR pipe with cooler sub-assembly may be clogged.
When idling while warming up the engine, the actuator operates and the EGR pipe with cooler sub-assembly is bypassed. However, if the connector of the No. 1 vacuum switching valve assembly (for EGR cooler) is disconnected, the EGR pipe with cooler sub-assembly is not bypassed and it is possible to check if the EGR pipe with cooler sub-assembly is clogged.
Result | ||||||||
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As the measured values may differ from those shown below 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.
The problem may be a temporary, due to the entry of deposits or foreign matter. Check that there are no deposits or foreign matter in the electric EGR control valve assembly or mass air flow meter assembly.
Reference | ||||||||
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B | Нажмите здесь |
A |
READ VALUE USING GTS (MAF)
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF.
Powertrain > Engine and ECT > Data ListTester Display |
---|
MAF |
Read the value.
Standard | ||||||
---|---|---|---|---|---|---|
|
Result | |||
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|
NG | Нажмите здесь |
OK |
PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR EGR COOLER BYPASS)
Connect the GTS 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 and wait for 30 seconds.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF.
Powertrain > Engine and ECT > Data ListTester Display |
---|
MAF |
Read the MAF value displayed on the GTS while the engine is idling.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EGR Cooler Bypass / All Data / EGR Cooler Bypass Position and MAF.
Powertrain > Engine and ECT > Active TestActive Test Display |
---|
Activate the VSV for EGR Cooler Bypass |
Data List Display |
---|
MAF |
EGR Cooler Bypass Position |
Whether the EGR is passing through the bypass side or cooler side during the Active Test can be confirmed by checking EGR Cooler Bypass Position.
Using the Active Test function, switch the No. 1 vacuum switching valve assembly (for EGR cooler) between "Cooler" and "Bypass" a few times, and then check whether the MAF value changes after switching the valve from "Cooler" to "Bypass".
If idling continues for 20 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 restart the engine.
Result | ||||||||
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|
If the EGR pipe with cooler sub-assembly is clogged, the MAF value changes.
B | Нажмите здесь |
A |
REMOVE DEPOSIT (ELECTRIC EGR CONTROL VALVE ASSEMBLY)
Remove the electric EGR control valve assembly.
Click hereНажмите здесь
Visually check the electric EGR control valve assembly for deposits.
If there are deposits, clean the electric EGR control valve assembly.
When cleaning the electric EGR control valve assembly, make sure the valve is completely closed.
When cleaning the electric EGR control valve assembly, perform initialization procedure.
Click hereНажмите здесь
Do not forcibly open the valve, as it may be damaged or deformed.
When cleaning the electric EGR control valve assembly, use a piece of cloth soaked with cleaning solvent. Spraying solvent directly onto these parts or soaking the parts in solvent may damage the parts.
If the EGR valve does not open properly or is stuck closed, the amount of intake air increases and combustion sounds and engine vibration may increase.
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.
Result | ||
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|
NEXT | Нажмите здесь |
GO TO STEP 33 |
REPLACE EGR PIPE WITH COOLER SUB-ASSEMBLY
Replace the EGR pipe with cooler sub-assembly.
Click hereНажмите здесь
Result | ||
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|
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Result | |||
---|---|---|---|
|
OK |
END |
NG | Нажмите здесь |
GO TO STEP 36 |
REPLACE MASS AIR FLOW METER ASSEMBLY
Replace the mass air flow meter assembly.
Click hereНажмите здесь
If foreign matter is stuck inside the mass air flow meter assembly, the output characteristics of the mass air flow meter assembly may change, resulting in a malfunction.
Before replacing the mass air flow meter assembly, perform a wire harness inspection and if there are any problems with the wire harness, repair or replace it.
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 33 |
PERFORM ACTIVE TEST USING GTS (ACTIVATE THE VSV FOR EGR COOLER BYPASS)
Connect the GTS 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 and wait for 30 seconds.
Start the engine and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / MAF.
Powertrain > Engine and ECT > Data ListTester Display |
---|
MAF |
Read the MAF value displayed on the GTS while the engine is idling.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the VSV for EGR Cooler Bypass / All Data / EGR Cooler Bypass Position and MAF.
Powertrain > Engine and ECT > Active TestActive Test Display |
---|
Activate the VSV for EGR Cooler Bypass |
Data List Display |
---|
MAF |
EGR Cooler Bypass Position |
Whether the EGR is passing through the bypass side or cooler side during the Active Test can be confirmed by checking EGR Cooler Bypass Position.
Using the Active Test function, switch the No. 1 vacuum switching valve assembly (for EGR cooler) between "Cooler" and "Bypass" a few times, and then check whether the MAF value changes after switching the valve from "Cooler" to "Bypass".
If idling continues for 20 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 restart the engine.
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
If the EGR pipe with cooler sub-assembly is clogged, the MAF value changes.
B | Нажмите здесь |
A |
CHECK EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY
Remove the DPF catalytic converter (exhaust manifold converter sub-assembly).
Click hereНажмите здесь
Visually check for catalyst clogging or carbon deposits adhering to the inner wall of the exhaust pipe upstream of the catalyst.
OK |
---|
Less than 10% of the cells are clogged. |
Result | |||
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|
NG | Нажмите здесь |
OK |
INSPECT TURBOCHARGER SUB-ASSEMBLY
Inspect the turbocharger sub-assembly.
Click hereНажмите здесь
Result | |||
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|
NG | Нажмите здесь |
OK |
CHECK FOR INTERMITTENT PROBLEMS
Check for intermittent problems.
Click hereНажмите здесь
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 40 |
REPLACE TURBOCHARGER SUB-ASSEMBLY
Replace the turbocharger sub-assembly.
Click hereНажмите здесь
Result | ||
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|
NEXT |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
Result | ||
---|---|---|
|
NEXT |
END |
REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY
Replace the DPF catalytic converter (exhaust manifold converter sub-assembly).
Click hereНажмите здесь
Perform the initialization procedure for DPF catalyst record clear.
Click hereНажмите здесь
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 40 |
REPLACE EGR PIPE WITH COOLER SUB-ASSEMBLY
Replace the EGR pipe with cooler sub-assembly.
Click hereНажмите здесь
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 40 |
REPAIR OR REPLACE INTAKE SYSTEM
Repair or replace the malfunctioning part in the intake system.
Result | ||
---|---|---|
|
NEXT | Нажмите здесь |
GO TO STEP 33 |
COMPARE WITH SIMILAR VEHICLE WITH SAME ENGINE
Confirm the situation in which the lack of power was experienced by the customer again, and compare the driving feeling under the same conditions using a similar vehicle with the same engine while collecting data with the GTS.
Confirm the state of the following conditions when the lack of power was experienced.
Accelerator pedal position (vehicle load)
Vehicle speed
Engine coolant temperature
Ambient temperature
Driving conditions before the lack of power occurred
Climate
Road and traffic conditions
When (what day) the problem was noticed
Whether the problem occurs suddenly or gradually
How often the problem occurs
Why the customer felt there is a lack of power (e.g. the customer compared their vehicle with another vehicle, somebody told the customer that their vehicle has a lack of power, etc.)
Level of lack of power (slight or drastic)
Result | ||||||
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A | Нажмите здесь |
GO TO STEP 5 |
B |
EXPLAIN THE INVESTIGATION RESULT TO CUSTOMER
Vehicle performance is normal.
There is no problem at this point in time. However, if the problem reoccur, ask the customer to explain in detail the situation in which the problem occurred.
The best course may be to have the customer ride in another vehicle with the same specifications to understand that there is no problem with the customer's vehicle.
Result | ||
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NEXT |
END |