| DTC Code | DTC Name |
|---|---|
| Engine Difficult to Start or Stalling |
DESCRIPTION
Faults and Symptoms of Common Rail Diesel Components
Engine Control
| Main fault | Decrease in performance (foreign matter is stuck) | |
| 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 sub-assembly. |
||
| Symptom and Corresponding Main Fault |
|
|
| Data List | MAP | |
| Main fault |
|
|
| Symptoms | Lack of power (when vehicle is starting, under heavy load) (Black smoke is not emitted when racing while vehicle is stopped) |
|
| Data List | MAP
|
|
| Main fault | Blockage | |
| Symptoms | Lack of power (high engine speed, under heavy load) | |
| 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 | |
| Main fault | Battery is depleted | |
| Symptoms | Difficult to start (cannot crank, crank speed is low), horn is quiet | |
| Data List | Battery Voltage When cranking, battery voltage is below 5 V. |
|
| 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
|
|
| Main fault | Starter system malfunction | |
| Symptoms | Difficult to start | |
| Data List | Starter Signal
|
|
Diesel Injection
| Main fault | - | |
| Symptoms | Difficult to start, engine stalling, rough idle, lack of power | |
| Data List | Common Rail Pressure, Target Common Rail Pressure
Tip:
|
|
| Diagnostic Trouble Code | Even if Common Rail Pressure 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 | Common Rail Pressure, 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 Common Rail Pressure 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 | Does not completely close | |
| Symptoms | Difficult to start, engine stall, rough idle, lack of power | |
| Main fault | Open circuit, decrease in performance (foreign matter is stuck) | |
| Symptoms | Difficult to start, rough idle, engine stall, lack of power | |
| Data List | Common Rail Pressure, 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 Valve Pos
EGR Close Lrn. Val.,
|
|
Diesel Throttle
| Main fault | Stuck, does not move smoothly | |
| Symptoms |
|
|
| Data List |
|
|
Data List Related to Starting Trouble
MAP
MAF
Intake Air
Coolant Temp
Battery Voltage
Starter Signal
Engine Speed of Cyl #1 (to #4)
(Output only when the "Check the Cylinder Compression" Active Test is performed)
Target Common Rail Pressure
Common Rail Pressure
Injection Feedback Val #1 (to #4)
Injection Volume
Actual Throttle Position
Target EGR Valve Pos
Actual EGR Valve Pos
EGR Close Lrn. Val.
INSPECTION PROCEDURE
Explanation of Symptom
| Starting Trouble | For good starting it is essential to have:
The fuel is ignited by the heat which is generated by compression pressure. With problems such as a depleted battery, the crankshaft speed can become low, or if the engine compression is poor due to leakage, the compression pressure will not rise and there will be difficulty starting. When the engine is cold, even if there is compression heat, it will escape from the combustion chamber. For this reason, when the engine is started when it is cold, the glow plugs heat the compressed air. Also, after starting the engine, by charging the glow plugs for a fixed time set according to the engine coolant temperature, diesel knocking and white smoke are prevented. The quantity of fuel injected is determined by the fuel pressure and also the amount of time the injector assembly is open. |
Trouble Area Chart According to Problem Cause
After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
After replacing an injector assembly, the ECM needs registration (Click here).
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 age. Do not assume the vehicle is normal when the Data List outputs standard values. There may be concealed factors of the malfunction.
PROCEDURE
CHECK ENGINE CRANKING CONDITION
Check the engine cranking condition.
| Result | Proceed to |
|---|---|
| Cranking is OK. | A |
| Low cranking speed.
Tip:
When cranking speed is low, especially when the temperature is low, check if the engine oil grade matches the recommendation. |
B |
| Does not crank at all. | C |
READ ALL OUTPUT DTCS
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: System Select / Health Check.
Check the DTCs.
| Result | Proceed to |
|---|---|
| No DTC is output | A |
| Engine related DTCs are output | B |
If only DTC P1604 is output, proceed to step 3.
TAKE SNAPSHOT DURING STARTING AND IDLING (PROCEDURE 3)
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 / Diesel Starting.
Take a snapshot when idling with no load after the engine is warmed up and when starting trouble is occurring.
A snapshot can be used to compare vehicle data from the time of the malfunction to normal data and is very useful for troubleshooting.
When there is trouble starting with a cold engine, take the snapshot when the engine is cold. Then warm up the engine (engine coolant temperature is 75°C (167°F) or higher) and after idling the vehicle for 1 minute (A/C off, electrical load off), take a snapshot of the data for 15 seconds while idling.
Take a snapshot when the problem is occurring, such as when the engine is cold. However, if the problem does not reoccur, it is acceptable to only take a snapshot after the engine is warmed up and when the engine is started.
CHECK SNAPSHOT (COMMON RAIL PRESSURE)
Check Common Rail Pressure in the snapshot taken in procedure 3 when the engine was started.
| Result | Proceed to |
|---|---|
| At the point in the illustration labeled "a", Common Rail Pressure is less than 10000 kPa from the value of Common Rail Pressure when cranking started | A |
| At the point in the illustration labeled "c", Common Rail Pressure is below Target Common Rail Pressure by 15000 kPa or more | B |
| Common Rail Pressure increases to a value that is higher than Target Common Rail Pressure immediately after cranking, and, at the point in the illustration labeled "d", Common Rail Pressure is higher than Target Common Rail Pressure | C |
| Except above | D |
Even if Common Rail Pressure is temporarily higher than Target Common Rail Pressure, as shown at the point in the illustration labeled "b", the fuel supply pump is normal.
Common rail pressure is about 25000 to 35000 kPa when the engine is cranking and the engine coolant temperature is 0°C (32°F) or higher.
Fuel pressure increases rapidly during cranking.
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. |
When there is a lack of fuel, fuel pressure drops.
Inspect for fuel filter clogging (check that the fuel filter is not clogged).
Reconnect the inlet hose.
CHECK HARNESS AND CONNECTOR (PRE-STROKE CONTROL VALVE - ECM)
Disconnect the pre-stroke control valve connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Reconnect the pre-stroke control valve connector.
Reconnect the ECM connector.
REPLACE FUEL SUPPLY PUMP ASSEMBLY (PRE-STROKE CONTROL VALVE)
Replace the fuel supply pump assembly (Click here).
BLEED AIR FROM FUEL SYSTEM
Bleed the air from the fuel system (Click here).
READ VALUE USING GTS (COMMON RAIL 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 / Common Rail Pressure.
Start the engine.
Read the values while cranking and idling the engine.
| Result | Proceed to |
|---|---|
| The engine cannot be started or the engine can be started but Common Rail Pressure is below 20000 kPa 2 seconds after the starter signal changes from OFF to ON | B |
| Except above | A |
INSPECT INJECTOR ASSEMBLY (INSPECTION FOR VALVE CLOSING PROBLEM)
Remove the glow plug assembly for all the cylinders (Click here).
Visually check if there is fuel on the glow plugs.
If there is fuel on a glow plug, fuel may be leaking from an injector assembly.
After replacing an injector assembly, make sure that the common rail pressure (fuel pressure) is within 5000 kPa of the target fuel pressure while cranking the engine.
If there is fuel on a glow plug, fuel may have mixed with the engine oil. Check the engine oil amount and whether the engine oil smells of diesel fuel. If the oil level is above the full line or the engine oil smells of diesel fuel, replace the engine oil.
Install the glow plug assembly (Click here).
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.
BLEED AIR FROM FUEL SYSTEM
Bleed the air from the fuel system (Click here).
READ VALUE USING GTS (COMMON RAIL PRESSURE)
Check Common Rail Pressure in the snapshot taken in procedure 3 when the engine was warmed up.
| Result | Proceed to |
|---|---|
| Difference between Common Rail Pressure and Target Common Rail Pressure is 5000 kPa (51.0 kgf/cm2, 725 psi) or more |
A |
| Except above | B |
REPLACE FUEL SUPPLY PUMP ASSEMBLY (PRE-STROKE CONTROL VALVE)
Replace the fuel supply pump assembly (Click here).
REPLACE INJECTOR ASSEMBLIES OF ALL CYLINDERS
Replace the injector assemblies of all cylinders (Click here).
When replacing the injector assembly for a cylinder, always be sure to use a new No. 1 injection pipe sub-assembly and a new No. 2 injection pipe sub-assembly.
Follow the procedure in the repair manual and temporarily install the No. 1 injection pipe sub-assembly, No. 2 injection pipe sub-assembly and No. 1 nozzle leakage pipe assembly, 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 sub-assembly may become incomplete, resulting in a fuel leak.
READ VALUE USING GTS (INJECTOR FEEDBACK VAL #1 TO #4 AND INJECTION VOLUME)
Check Injection Feedback Val # in the snapshot taken in procedure 3 when the engine was idling.
| Result | Proceed to |
|---|---|
| Injection Feedback Val #1 to #4 are 3 mm3/st or less. Injection Volume is more than 16 mm3/st. |
A* |
| Injection Feedback Val for at least one cylinder is more than +3 mm3/st
Tip:
There may be a malfunction in the corresponding cylinder. |
B |
| Except above | C |
*: When this case occurs, usually symptoms may be noticeable, such as difficulty starting, lack of power.
The shift lever should be in neutral and the A/C switch and all accessory switches should be off.
REPLACE INJECTOR ASSEMBLIES OF ALL CYLINDERS
Replace the injector assemblies of all cylinders (Click here).
When replacing the injector assembly for a cylinder, always be sure to use a new No. 1 injection pipe sub-assembly and a new No. 2 injection pipe sub-assembly.
Follow the procedure in the repair manual and temporarily install the No. 1 injection pipe sub-assembly, No. 2 injection pipe sub-assembly and No. 1 nozzle leakage pipe assembly, 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 sub-assembly may become incomplete, resulting in a fuel leak.
PERFORM ACTIVE TEST USING GTS (CHECK THE CYLINDER COMPRESSION)
Use this Active Test to help determine whether a cylinder has compression loss or not.
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 / Active Test / Check the Cylinder Compression / Data List / Compression / Engine Speed of Cyl #1 to #4.
Check the engine speed during the Active Test.
| Result | Proceed to |
|---|---|
| Except below | A |
| The values of Engine Speed Cyl #1 to #4 are within 10 rpm of each other. | B |
When cranking, if the speed of a cylinder is approximately 100 rpm more than the other cylinders, there is probably a complete loss of compression in that cylinder.
CHECK CYLINDER COMPRESSION PRESSURE OF MALFUNCTIONING CYLINDER
Measure the compression of the cylinder that had a high speed during the "Check the Cylinder Compression" Active Test.
Check the cylinder compression pressure (Click here).
REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDER
It can be determined that the injector assembly is faulty as the corresponding cylinder is malfunctioning, but has no compression loss.
Replace the injector assembly of malfunctioning cylinder (Click here).
When replacing the injector assembly for a cylinder, always be sure to use a new No. 1 injection pipe sub-assembly and a new No. 2 injection pipe sub-assembly.
Follow the procedure in the repair manual and temporarily install the No. 1 injection pipe sub-assembly, No. 2 injection pipe sub-assembly and No. 1 nozzle leakage pipe assembly, 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 sub-assembly may become incomplete, resulting in a fuel leak.
REPLACE FUEL FILTER ELEMENT ASSEMBLY
Replace the fuel filter element assembly (Click here).
BLEED AIR FROM FUEL SYSTEM
Bleed the air from the fuel system (Click here).
REGISTER INJECTOR COMPENSATION CODE AND PERFORM PILOT QUANTITY LEARNING
Register the injector compensation codes (Click here).
Perform the injector pilot quantity learning (Click here).
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
INSPECT INJECTOR POWER SOURCE CIRCUIT
Perform troubleshooting for DTC P062D during a startability malfunction, even if DTC P062D is not output (Click here).
When troubleshooting the injector power source circuit, check the following locations, as one may contain the cause of the malfunction
EDU relay
Injector assembly circuit
ECM
When the engine cannot be started due to a malfunction in the injector power source circuit, once the DTCs are cleared, P062D cannot be stored even when the problem symptoms are reproduced and a startability malfunction occurs.
Since P062D cannot be stored when starting the engine, fuel injection cannot be performed even though fuel injection signals are output from the ECM. Therefore, using the GTS during a startability malfunction to check the data shows that an excessive amount of fuel is supplied to the common rail assembly by the fuel supply pump assembly, and as a result, the Common Rail Pressure is higher than the Target Common Rail Pressure.
Perform the following procedure when a malfunction cannot be found during the troubleshooting procedure for P062D and the Common Rail Pressure when starting the engine is higher than the Target Common Rail Pressure.
Perform the troubleshooting procedure for DTC P062D and proceed to the diagnostic flow situations where the engine does not start.
| Result | Proceed to |
|---|---|
| Injector power source circuit is normal | A |
| Injector power source circuit is abnormal | B |
INSPECT INJECTOR ASSEMBLY
Disconnect the injector assembly connectors.
Measure the resistance of the injector assembly.
| OK |
|---|
| No open circuit malfunction. |
Reconnect the injector assembly connectors.
CHECK TEMPERATURE WHEN STARTING TROUBLE OCCURS
Check the temperature when starting trouble occurs.
| Result | Proceed to |
|---|---|
| Difficult to start only for cold engine. | A |
| Difficult to start both for cold and warmed up engine. | B |
READ VALUE USING GTS (COOLANT TEMP)
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 / Diesel Starting / Coolant Temp.
Read the value displayed on the GTS.
| OK |
|---|
| Coolant Temp is not high when the engine is cold, and not low after the engine is warmed up. |
INSPECT GLOW PLUG ASSEMBLY (RESISTANCE)
Inspect the glow plug assembly (Click here).
CHECK FUEL QUALITY
Check that only diesel fuel is being used.
Check that the fuel does not contain any impurities.
READ OUTPUT DTC (RELATED 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 DTCs.
| Result | Proceed to |
|---|---|
| No DTC is output | A |
| Engine related DTCs are output | B |
CHECK COMMUNICATION BETWEEN GTS AND ECM
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Check if the normal starting screen appears (check whether communication with the ECM is possible).
Use a GTS that is able to communicate with other vehicles.
| OK |
|---|
| Communication is possible (vehicle can be recognized). |
READ VALUE USING GTS (STARTER SIGNAL AND NEUTRAL POSITION SW SIGNAL)
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 / Primary / Starter Signal and Neutral Position SW Signal.
Read the value displayed on the GTS.
| OK | |||||||||
|---|---|---|---|---|---|---|---|---|---|
|
| Result | Proceed to |
|---|---|
| OK | A |
| NG | B |
CHECK STARTING SYSTEM
Inspect the starting system.
Be sure to inspect the following areas:
Battery
Starter relay
Starter assembly
Smart entry and start system
Immobiliser system
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
CHECK BATTERY CONDITIONClick here
GO TO RELATED DTCClick here
REPAIR OR REPLACE HARNESS OR CONNECTOR
END
CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION
END
REPAIR OR REPLACE MALFUNCTIONING PARTS
REPLACE ENGINE COOLANT TEMPERATURE SENSORClick here
REPLACE GLOW PLUG ASSEMBLYClick here
GO TO DTC
CHECK VC OUTPUT CIRCUITClick here
INSPECT PARK/NEUTRAL POSITION SWITCH ASSEMBLYClick here