P0093 Fuel System Leak Detected - Large Leak

DTC    P0093    Fuel System Leak Detected - Large Leak


 

DESCRIPTION

 

DTC No. DTC Detection Condition Trouble Area
P0093 Fuel leaks in high-pressure areas
(1 trip detection logic)
  1. Fuel line between supply pump and common rail
  2. Fuel line between common rail and each injector
  3. Supply pump
  4. Common rail
  5. Injectors
  6. Pressure limiter
  7. Open or short in EDU circuit (P0200 set simultaneously)
  8. Open or short in injector circuit
  9. EDU (P0200 set simultaneously)
  10. ECM

HINT:

  1. DTC P0093 can be detected if the problem occurs when the engine idles for 1 minute and then it runs at 2,500 rpm for 30 seconds.
  2. If DTC P1229 is set, P0093 (fuel leaks in high-pressure areas) may be set simultaneously. This may be due to the extremely high internal fuel pressure in the common rail causing the pressure limiter to open. The ECM may interpret this as a fault and set P0093.
  3. For more information on the common rail system, refer to the system description.
  4. If P0093 is present, refer to the "Diagnostic Trouble Codes (DTCs) Table for the Common Rail System".
  5. When DTC P0093 is set, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Press.
Reference: 
Engine Speed Fuel Pressure
Idling Approximately 35 to 45 MPa
3,000 rpm (No engine load) Approximately 58 to 68 MPa

 

MONITOR DESCRIPTION

  1. 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 after the engine is started. The ECM sets this DTC if the drop in the internal fuel pressure is large when injecting the fuel.
    In the common rail system, high-pressure fuel is always supplied to the high-pressure areas including the supply pump, common rail, injectors, and piping. The ECM adjusts the suction control valve opening angle to obtain the desired fuel pressure.
    If this DTC is set, 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 1 minute. The fail-safe mode continues until the ignition switch is turned off.

 

MONITOR STRATEGY

 

Required sensors Fuel Pressure sensor
Frequency of operation Continuous
Duration 1 second
MIL operation 1 driving cycle


 

TYPICAL ENABLING CONDITIONS

 

Item Specification Specification
Minimum Maximum
Engine speed 700 rpm -
The monitor will not run if the fuel pressure sensor or suction control valve circuit is malfunctioning.


 

TYPICAL MALFUNCTION THRESHOLDS

 

Threshold
Large drop in the internal fuel pressure when injecting fuel


 

INSPECTION PROCEDURE

NOTICE:

After replacing an injector, the ECM needs registration.
1.CHECK OTHER DTC OUTPUT
  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result:
    Display (DTC Output) Proceed to
    P0093 A
    P0093 and P0200 and/or P1229 B
  B
GO TO DTC CHART
 
A  
 

 

2.CHECK FUEL LEAKAGE
  1. Visually check the supply pump, each injector and fuel line located between the supply pump and common rail for fuel leaks or fuel pressure leaks. Also, perform the same check on the fuel lines between the common rail and each injector.

    HINT:

    There is possibility that fuel leaks inside the components (supply pump, etc.) have occurred.
    OK:
    No leakage
  NG
REPAIR OR REPLACE FUEL LEAKAGE POINT
 
OK  
 

 

3.READ VALUE OF COMPENSATORY INJECTION VOLUME
  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester ON.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Injection Feedback Val #1, #2, #3 and #4.

  1. Read the value.

    OK:
    Compensatory injection volume is outside -4.9 mm3 and 4.9 mm3.

    HINT:

    1. If the injector is malfunctioning, the compensatory injection volume remains outside -4.9 mm3 and 4.9 mm3.
    2. The compensatory injection volume is usually between -3.0 mm3 and 3.0 mm3.
  NG
REPLACE INJECTOR ASSEMBLY
 
OK  
 

 

4.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (FUEL LEAK TEST)
  1. Connect the intelligent tester to the DLC3.

  1. Start the engine and turn the tester ON.

  1. Enter the following menus: Powertrain / Engine and ECT / Active Test / Test the Fuel Leak.

  1. Check for fuel leaks in the high-pressure areas.

NEXT  
 
CHECK IF DTC OUTPUT RECURS