DTC    P0093    Fuel System Leak Detected - Large Leak

для подготовки Нажмите здесь


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

УКАЗАНИЕ:
  1. DTC P0093 can be detected if the problem occurs when the engine idles for 1 minute and then it runs at 2500 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 (See page Нажмите здесь).
  4. If P0093 is present, refer to "Diagnostic Trouble Codes (DTCs) Table for the Common Rail System" (See page Нажмите здесь).
  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
3000 rpm (No engine load)
Approximately 57 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
Minimum
Maximum
Engine speed
750 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

ПРИМЕЧАНИЕ:
After replacing an injector, the ECM needs registration (See page Нажмите здесь).

УКАЗАНИЕ:
Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.

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:

    Result
    		Proceed to
    DTC P0093 is output
    		A
    DTC P0093 and P0200 and/or P1229 are output
    		B



B
GO TO DTC CHART (Нажмите здесь)
A


2.INSPECT FOR FUEL LEAK

  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.

    УКАЗАНИЕ:
    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.

    Standard:
    The compensatory injection volume is outside -4.9 mm3 and 4.9 mm3.

    УКАЗАНИЕ:
    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 -3.5 mm3 and 3.5 mm3.



NG
REPLACE INJECTOR ASSEMBLY (Нажмите здесь)
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.


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