ECD SYSTEM, Diagnostic DTC:P0093

DTC Code	DTC Name
P0093	Fuel System Leak Detected - Large Leak

DESCRIPTION

A fuel pressure sensor mounted on the common rail assembly converts the fuel pressure inside the common rail assembly into an electric signal, and outputs it to the ECM. The ECM controls the supply pump assembly in order to maintain the fuel pressure inside the common rail assembly at a target pressure calculated by the ECM.

Refer to System Description.

Click here


DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P0093	Fuel System Leak Detected - Large Leak	Fuel pressure drop before and after fuel injection is larger than the threshold a certain number of times (0.2 seconds or more) (1 trip detection logic).	Fuel line between supply pump assembly and common rail assembly Fuel line between common rail assembly and injector assembly Supply pump assembly Pressure discharge valve (built into common rail assembly) Fuel pressure sensor (built into common rail assembly) Injector assembly Crankshaft position sensor Fuel filter element assembly Open or short in injector driver (EDU) circuit (P0201, P0202, P0203, P0204 and/or P062D set simultaneously) Open or short in injector assembly circuit (P0201, P0202, P0203, P0204 and/or P062D set simultaneously) Injector driver (EDU) (P0201, P0202, P0203, P0204 and/or P062D set simultaneously)	Comes on	DTC stored


DTC No.	Data List
P0093	Fuel Press Target Common Rail Pressure

Tip:

For more information on the common rail system, refer to System Description.
Click here
If the drop in the internal fuel pressure is large when injection fuel, the ECM interprets this as a fault and stores P0093.
If DTC P0093 is present, refer to the Diagnostic Trouble Code Chart.
Click here Click here

When DTC P0093 is set, check the internal fuel pressure of the common rail assembly by entering the following menus on the GTS: Powertrain / Engine and ECT / Data List / All Data / Fuel Press and Target Common Rail Pressure.


Engine Speed	Fuel Press
Idling	Approximately 27000 to 45000 kPa
3000 rpm (No engine load)	Approximately 44000 to 78000 kPa

When there is an operating problem with the supply pump assembly (Fuel Press is less than Target Common Rail Pressure), the values of Injection Pressure Correction and Target Pump SCV Current will increase.

MONITOR DESCRIPTION

P0093 (Fuel leaks in high pressure areas):

This DTC indicates that fuel leaks exist in high pressure areas in the common rail system. The ECM constantly monitors the internal fuel pressure of the common rail assembly after the engine is started. The ECM stores this DTC if the drop in the internal fuel pressure is large when the fuel is injected.

In the common rail system, high pressure fuel is always supplied to the high pressure areas including the supply pump assembly, common rail assembly, injector assemblies and piping. The ECM adjusts the suction control valve opening angle to obtain the target internal fuel pressure.

If this DTC is stored, the ECM enters fail-safe mode. The fail-safe mode suspends both fuel injection and supply pump operation, and then stops the engine. Before stopping the engine, the ECM permits the vehicle to be driven for 60 seconds. The fail-safe mode continues until the ignition switch is turned off.

MONITOR STRATEGY


Required Sensor	Fuel pressure sensor
Frequency of operation	Continuous
Duration	1 second
MIL operation	1 driving cycle

CONFIRMATION DRIVING PATTERN


DTC No.	DTC Detection Drive Pattern
P0093	After idling for 60 seconds, run engine at 2500 rpm for 30 seconds. Fully depress the accelerator pedal for 5 seconds, and then release it. (A) Rev the engine to 3000 rpm and fully release the accelerator pedal immediately after the engine reaches 3000 rpm. (B) Repeat procedures (A) and (B) 5 times.

CAUTION / NOTICE / HINT

Note:

Soon after starting the engine, visually check for fuel leaks in the fuel line.
After replacing the supply pump assembly, the ECM needs initialization.
Click here
After replacing an injector assembly, the ECM needs registration.
Click here

Tip:

Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

Tip:

The following can be deduced from the above freeze frame data:
- The common rail fuel pressure dropped suddenly when the engine was being run at a moderate engine speed during engine warmup and DTC P0093 was stored at the point when data set 4 was recorded.
- Injection Feedback Val #3 is 5.0 mm³/st which is large (the normal value is between -3.0 and 3.0 mm³/st) and indicates that the injector of cylinder 3 may be malfunctioning.
Actual cause: In this case, foreign matter in the fuel is stuck inside an injector causing the injector to malfunction temporarily.
In order to remove the foreign matter in the fuel (the major cause of the problem), the fuel filter case needs to be cleaned and the fuel filter needs to be replaced.

Tip:

*1: Fuel Press suddenly decreases for a moment, and then recovers. This can be seen clearly by comparing it to Target Common Rail Pressure.

Tip:

*2: Injection Feedback Val #3 is 5.0 mm³/st which is large (the normal value is between -3.0 and 3.0 mm³/st) and indicates that the injector assembly of cylinder 3 may be malfunctioning.

Table 1. Reference Values for DTC P0093 Storage Point (Point A)
Data List	Value	Unit
Engine Speed	1478	rpm
Fuel Press	8900	kPa
Target Common Rail Pressure	65320	kPa
Injection Volume (Point A)	51.26*1	mm³/st
Injection Volume (Point A`)	9.76	mm³/st
Accel Position	63.67	%
Injection Feedback Val #1	-1.1	mm³/st
Injection Feedback Val #2	-2.5	mm³/st
Injection Feedback Val #3	5.0	mm³/st
Injection Feedback Val #4	-1.8	mm³/st
MIL	ON	-

PROCEDURE

CHECK FUEL LEAK (IN HIGH PRESSURE AREAS)

Before starting the engine, visually check for fuel leaks from the supply pump assembly, injector assemblies, common rail assembly and the fuel pipes in high pressure areas.

OK

No fuel leaks in high pressure areas.

Result


Proceed to
OK
NG

REPAIR OR REPLACE FUEL LEAK POINT

CHECK ANY OTHER DTCS OUTPUT (PROCEDURE 2) (IN ADDITION TO DTC P0093) AND RECORD STORED DTC AND FREEZE FRAME DATA

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 and freeze frame data.

Powertrain > Engine > Trouble Codes

Result


Result	Proceed to
Except below	A
DTC P0093 and "P0335 and/or P0339" are output	B
DTC P0093 and "P0190, P0192 and/or P0193" are output	C

GO TO CRANKSHAFT POSITION SENSOR "A" CIRCUIT (DTC P0335 AND P0339)

Click here

GO TO FUEL RAIL PRESSURE SENSOR CIRCUIT (DTC P0190, P0192 AND P0193)

Click here

CHECK FUEL RECEIVER GAUGE (AMOUNT OF FUEL)

Check if the fuel level is low.

Result


Result	Proceed to
The indicator (fuel level warning) is illuminated	A
The indicator (fuel level warning) is not illuminated	B

CHECK FREEZE FRAME DATA (INJECTION FEEDBACK VAL #1 TO #4)Click here

ADD FUEL

Add fuel.

Result


Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)

Using the hand pump mounted on the fuel filter cap, bleed the air from the fuel system. Continue pumping until the pump resistance increases.
Note:
- Hand pump pumping speed: Max. 2 strokes/sec.
- The hand pump must be pushed with a full stroke during pumping.
- When the fuel pressure at the supply pump inlet port reaches a saturated pressure, the hand pump resistance increases.
- If pumping is interrupted during the air bleeding process, fuel in the fuel line may return to the fuel tank. Continue pumping until the hand pump resistance increases.
- If the hand pump resistance does not increase despite consecutively pumping 200 times or more, there may be a fuel leak between the fuel tank and fuel filter element assembly, the hand pump may be malfunctioning, or the vehicle may have run out of fuel.
- If a large amount of air remains inside the fuel system, the common rail pressure does not rise to the pressure range necessary for normal use, and the engine cannot be started.
Start the engine.
Note:
- If a large amount of air remains inside the fuel system, the starter may need to be cranked for 10 seconds or more to start the engine.
- Do not crank the engine continuously for more than 20 seconds. The battery may be discharged.
- Use a fully-charged battery.
1. When the engine can be started, proceed to the next step.
2. If the engine cannot be started, bleed the air again using the hand pump until the hand pump resistance increases. Then start the engine.
Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.
Start the engine [A].

Enter the following menus: Powertrain / Engine and ECT / Active Test / Test the Fuel Leak [B].

Powertrain > Engine > Active Test


Tester Display
Test the Fuel Leak

Perform the following test 5 times with Start/Stop intervals of 10 seconds: Active Test / Test the Fuel Leak [C].
Allow the engine to idle for 3 minutes or more after performing the Active Test for the 5 times [D].
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Read the DTCs.

Powertrain > Engine > Trouble Codes
Tip:
- When no DTCs are output, the air bleeding is completed.
- If any DTCs are output, proceed to the next step.
Repeat steps [A] to [D].
Clear the DTCs.

Powertrain > Engine > Clear DTCs
Start the engine and warm it up.
Confirm that the shift lever is in neutral and securely apply the parking brake.
Fully depress the accelerator pedal for 5 seconds, and then release it [E].
Rev the engine to 3000 rpm and fully release the accelerator pedal immediately after the engine reaches 3000 rpm [F].
Repeat steps [E] and [F] 5 times.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

Result


Result	Proceed to
DTC is output	A
DTC is not output	B

DTC CAUSED BY RUNNING OUT OF FUEL

CHECK FREEZE FRAME DATA (INJECTION FEEDBACK VAL #1 TO #4)

Read the value of Injection Feedback Val #1 to #4 in the Freeze Frame Data recorded in Procedure 2.

Result


Result	Proceed to
Except below	A
Injection Feedback Val for at least one cylinder is 5.0 mm³/st in at least 1 set of freeze frame data	B

Tip:

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.

REPLACE FUEL FILTER ELEMENT ASSEMBLYClick here

READ VALUE USING GTS (FUEL PRESS)

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs

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

Powertrain > Engine > Data List


Tester Display
Fuel Press

Start the engine.

Read the value of Fuel Press while cranking and idling the engine.

Result


Result	Proceed to
Except below	A
The engine cannot be started or the engine can be started but Fuel Press is less than 20000 kPa 2 seconds after the starter signal changes from off to on.	B

INSPECT INJECTOR ASSEMBLY (INSPECTION FOR VALVE CLOSING PROBLEM)Click here

READ VALUE USING GTS (INJECTION FEEDBACK VAL #1 TO #4)

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Start the engine and warm it up.

Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Injection Feedback Val #1 to #4.

Powertrain > Engine > Data List


Tester Display
Injection Feedback Val #1
Injection Feedback Val #2
Injection Feedback Val #3
Injection Feedback Val #4

Read the values.

Standard


GTS Display	Engine Condition*	Normal Value
Injection Feedback Val #1 Injection Feedback Val #2 Injection Feedback Val #3 Injection Feedback Val #4	Idling	-3.0 mm³/st to 3.0 mm³/st

Tip:

*: The A/C switch and all accessory switches should be off, the engine coolant temperature should be 75°C (167°F) or higher and the engine should be idled for 1 minute or more.

Result


Result	Proceed to
Except below	A
Injection Feedback Val for at least one cylinder is higher than 3.0 mm³/st and engine vibration is abnormally large	B

Tip:

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.
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 (-3.0 mm³/st is the lowest normal value), 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.

REPLACE FUEL FILTER ELEMENT ASSEMBLYClick here

PERFORM ENGINE SPEED ACCELERATION

Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or higher.
Stop the vehicle and allow the engine to idle.
While checking the tachometer, fully depress the accelerator pedal for 5 seconds, and then release it [A].

Repeat procedure [A] 5 times.

Result


Result	Proceed to
No problems such as sluggishness or variations in the tachometer reading	A
Except above	B

READ VALUE USING GTS (ENGINE SPEED)Click here

REPLACE FUEL FILTER ELEMENT ASSEMBLY

Replace the fuel filter element assembly.
Click here

Result


Proceed to
NEXT

BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system.
Click here

Result


Proceed to
NEXT

PERFORM ACTIVE TEST USING GTS (TEST THE FUEL LEAK)

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 > Active Test


Active Test Display
Test the Fuel Leak


Data List Display
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.

Tip:

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.

The difference between the target fuel pressure and the actual fuel pressure 2 seconds after the Active Test starts is less than 10000 kPa (102.0 kgf/cm², 1451 psi).

Tip:

"Target Common Rail Pressure" is the target fuel pressure controlled by the ECM.
"Fuel Press" is the actual fuel pressure in common rail assembly.

Result


Result	Proceed to
The difference between the target fuel pressure and the actual fuel pressure 2 seconds after the Active Test starts is less than 10000 kPa (102.0 kgf/cm², 1451 psi)	A
Except above	B

INSPECT INJECTOR ASSEMBLY (INSPECTION FOR VALVE CLOSING PROBLEM)Click here

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

Tip:

Use this Active Test to determine the malfunctioning cylinder.

Connect the GTS to the DLC3.
Start the engine and turn the GTS on.

Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Select Cylinder Fuel Cut / #1 to #4.

Powertrain > Engine > Active Test


Tester Display
Control the Select Cylinder Fuel Cut

Check the 4 cylinders in sequence to identify any faulty cylinders by performing the power-balance inspection.
Tip:
- If the engine idle speed does not change when an injector assembly is disabled, the cylinder being tested is malfunctioning. Record any malfunctioning cylinders.
- If the cylinder being tested is normal, there will be a significant change in idle speed when the injection assembly is stopped for that cylinder.

Result


Proceed to
NEXT

REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDERClick here

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 plug assemblies.
Tip:
- If there is fuel on a glow plug assembly, 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 (51.0 kgf/cm², 725 psi) of the target fuel pressure while cranking the engine.
- If there is fuel on a glow plug assembly, 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.

Result


Proceed to
NEXT

REPLACE INJECTOR ASSEMBLY OF MALFUNCTIONING CYLINDER

Replace the injector assembly of the malfunctioning cylinder.
Click here
Note:
- 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


Proceed to
NEXT

BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system.
Click here

Result


Proceed to
NEXT

Register the injector compensation codes.
Click here
Perform the pilot quantity learning.
Click here

Result


Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)Click here

READ VALUE USING GTS (ENGINE SPEED)

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 / Engine Speed.

Powertrain > Engine > Data List


Tester Display
Engine Speed

Read the value while cranking and idling the engine.

Standard


GTS Display	Engine Condition	Specified Condition
Engine Speed	Cranking	50 to 400 rpm
Engine Speed	Idling with warm engine	750 to 850 rpm

Tip:

The value is the same as the actual engine speed and is displayed with no interruption on the GTS.

Result


Proceed to
OK
NG

REPLACE CRANKSHAFT POSITION SENSORClick here

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Tip:

If the MIL has illuminated before in the past, clear the DTC using the GTS before performing this inspection.

Click here

Check if the MIL illuminates up when vibration is applied to the wire harness and connectors between the fuel pressure sensor and ECM.

*1	Engine	*2	Engine Wire
*3	Common Rail Assembly (Fuel Pressure Sensor)	*4	Wire to Wire
*5	ECM	-	-
*a	Vibration Method (Reference)	-	-

Result


Result	Proceed to
MIL does not come on	A
MIL comes on	B

REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PRESSURE SENSOR - ECM)Click here

INSPECT FUEL TEMPERATURE SENSOR (SENSOR OUTPUT)

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 / Fuel Temperature.

Powertrain > Engine > Data List


Tester Display
Fuel Temperature

Read the value.

OK

The value is almost the same as the actual fuel temperature.

Tip:
When the engine is stopped and left overnight, the fuel temperature becomes the same as the ambient temperature.

Result


Proceed to
OK
NG

REPLACE FUEL TEMPERATURE SENSORClick here

CHECK FOR INTERMITTENT PROBLEMS

Check for intermittent problems.
Click here

Result


Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)Click here

REPLACE FUEL TEMPERATURE SENSOR

Replace the fuel temperature sensor.
Click here

Tip:
Before replacing the fuel temperature sensor, perform a wire harness inspection and if there are any problems with the wire harness, repair or replace it.

Result


Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Clear the DTCs.

Powertrain > Engine > Clear DTCs
Turn the ignition switch off and wait for 30 seconds or more.
Start the engine and warm it up (engine coolant temperature is 75°C (167°F) or more).
Confirm that the shift lever is in neutral and securely apply the parking brake.
Fully depress the accelerator pedal for 5 seconds and then release it [A].
Rev the engine to 3000 rpm and fully release the accelerator pedal immediately after the engine reaches 3000 rpm [B].
Repeat steps [A] and [B] 5 times.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Confirm that the DTC is not output.

Powertrain > Engine > Trouble Codes

Result


Proceed to
NEXT

END

REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Repair or replace the harness or connector (fuel pressure sensor - ECM).

Result


Proceed to
NEXT

CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM)

Tip:

If the MIL has illuminated before in the past, clear the DTC using the GTS before performing this inspection.

Click here

Check if the MIL illuminates up when vibration is applied to the wire harness and connectors between the fuel pressure sensor and ECM.

Result


Result	Proceed to
MIL comes on	A
MIL does not come on	B

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)Click here

REPLACE COMMON RAIL ASSEMBLY

Replace the common rail assembly.
Click here

Tip:
Before replacing the common rail assembly, perform a wire harness inspection and if there are any problems with the wire harness, repair or replace it.

Result


Proceed to
NEXT

BLEED AIR FROM FUEL SYSTEM

Bleed the air from the fuel system.
Click here

Result


Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)Click here

REPLACE CRANKSHAFT POSITION SENSOR

Replace the crankshaft position sensor.
Click here

Tip:
Before replacing the crankshaft position sensor, perform a wire harness inspection and if there are any problems with the wire harness, repair or replace it.

Result


Proceed to
NEXT

CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)Click here