ECD SYSTEM, Diagnostic DTC:P0093

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

DESCRIPTION

Refer to DTC P0087 Click here.

Refer to DTC P0088 Click here.

DTC No. DTC Detection Condition Trouble Area
P0093

DTC is output when following conditions (a), (b) and (c) are all met and if difference of common rail pressure that fuel pressure sensor detects before and after fuel injection varies greatly from difference of value that ECM calculates before and after fuel injection, ECM determines that there may be fuel leaks.

(a) Engine speed is 1500 rpm or higher.

(b) Fuel pressure sensor is normal (P0190, P0192, and P0193 are not detected).

(c) Suction control valve is normal (P0088, P0627 and P1229 are not detected).

  • Fuel leak (injection or supply pump assembly to common rail assembly to injector assembly)

  • Injector assembly

  • Injection or supply pump assembly (suction control valve)

  • Wire harness and connector

  • Common rail assembly

  • ECM

WIRING DIAGRAM

Refer to DTC P0087 Click here.

Refer to DTC P0088 Click here.

INSPECTION PROCEDURE

Note


  • After replacing the ECM, the new ECM needs registration Click here and initialization Click here.

  • After replacing the injection or supply pump assembly, the ECM needs initialization Click here.

  • After replacing the injector assembly, the ECM needs registration Click here.

Tech Tips

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 be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the tester on.

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

    6. Read the DTCs.

      Result
      Result Proceed to
      P0087, P0088, P0190, P0192, P0193, P0200, P0627 or P1229 is not output A
      DTC P0087, P0088, P0190, P0192, P0193, P0200, P0627 or P1229 is output B

    B

    GO TO DTC CHART Click here

    A

  2. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TEST THE FUEL LEAK)

    Tech Tips

    By performing this Active Test, the engine speed is maintained at 2000 rpm and the common rail assembly internal fuel pressure is raised to the maximum operating pressure. As a result, a fuel leak check can be conducted while retaining the high common rail pressure.


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

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

    6. Visually check the injection or supply pump assembly, injector assembly and fuel line located between the injection or supply pump assembly and common rail assembly for fuel leaks and fuel pressure leaks. Also, perform the same check on the fuel line between the common rail assembly and the injector assembly.

      Tech Tips

      There may be fuel leaks inside the components, such as the injection or supply pump assembly.

      OK
      No leakage.

    NG

    REPAIR OR REPLACE FUEL LEAKAGE POINT

    OK

  3. INSPECT INJECTION OR SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01CHX6E02
      Text in Illustration
      *1

      Component without harness connected

      (Injection or Supply Pump Assembly)
      *2 Suction Control Valve

      Disconnect the suction control valve connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 - 2 20°C (68°F) 1.9 to 2.3 Ω

    3. Reconnect the suction control valve connector.


    NG

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY Click here

    OK

  4. INSPECT INJECTION OR SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. Disconnect the suction control valve connector and then start the engine.

      OK
      Engine does not start.

    NG

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY Click here

    OK

  5. READ VALUE USING INTELLIGENT TESTER (TARGET PUMP SCV CURRENT)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Target Pump SCV Current.

    6. Read the value.

      Standard
      Engine Speed Result
      Idling 800 to 1400 mA

    NG

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY Click here

    OK

  6. READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

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

    6. Check that the internal fuel pressure of the common rail assembly is within the specification below.

      Standard
      Engine Speed Fuel Pressure
      Idling Approximately 25000 to 35000 kPa
      Result
      Result Proceed to
      NG A
      OK B

    B

    CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM) Click here

    A

  7. CHECK HARNESS AND CONNECTOR (ECM - FUEL PRESSURE SENSOR)


    1. Disconnect the ECM connector.

    2. Disconnect the fuel pressure sensor connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E22-26 (PCR1) - F17-2 (VP) Always Below 1 Ω
      E22-18 (VC) - F17-3 (VC) Always Below 1 Ω
      E22-28 (E2) - F17-1 (GND) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E22-26 (PCR1) or F17-2 (VP) - Body ground Always 10 kΩ or higher
      E22-18 (VC) or F17-3 (VC) - Body ground Always 10 kΩ or higher

    4. Reconnect the fuel pressure sensor connector.

    5. Reconnect the ECM connector.


    NG

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

    OK

  8. READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine.

    4. Turn the tester on.

    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel press.

    6. Wiggle the fuel pressure sensor connector and check that the fuel pressure reading does not change.

      OK
      The fuel pressure reading does not change.

    NG

    REPLACE COMMON RAIL ASSEMBLY Click here

    OK

  9. PERFORM INITIALIZATION (INJECTION OR SUPPLY PUMP ASSEMBLY)


    1. Perform initialization Click here.


    NEXT

  10. CHECK WHETHER DTC OUTPUT RECURS (DTC P0093)


    1. Replace the normal DLC3 cable (12 V specification) for the intelligent tester with the 24 V DLC3 cable.

      Note

      Be sure to use the 24 V DLC3 cable when connecting the intelligent tester to the DLC3. Using the normal DLC3 cable (12 V specification) will cause damage to the tester.

    2. Clear the DTC Click here.

    3. Warm up the engine.

    4. Drive the vehicle by 1500 rpm or more for 5 minutes.

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

    6. Read the DTC.

      Result
      Result Proceed to
      DTC is not output A
      DTC P0093 is output B

    B

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY Click here

    A

    END

  11. CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM)


    1. Disconnect the suction control valve connector.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      E22-2 (PCV+) - S9-1 Always Below 1 Ω
      E22-1 (PCV-) - S9-2 Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E22-2 (PCV+) or S9-1 - Body ground Always 10 kΩ or higher
      E22-1 (PCV-) or S9-2 - Body ground Always 10 kΩ or higher

    4. Reconnect the suction control valve connector.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (SUCTION CONTROL VALVE - ECM)

    OK

  12. INSPECT ECM (PCR VOLTAGE)


    1. A01CGXCE84
      Text in Illustration
      *1

      Component with harness connected

      (ECM)

      Start the engine.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      E22-26 (PCR1) - E22-28 (E2) Idling 1.3 to 1.7 V

    NG

    REPLACE COMMON RAIL ASSEMBLY Click here

    OK

    REPLACE INJECTOR ASSEMBLY Click here