ECD SYSTEM, Diagnostic DTC:P0088, P0627, P1229

DTC Code DTC Name
P0088 Fuel Rail / System Pressure - Too High
P0627 Fuel Pump Control Circuit / Open
P1229 Fuel Pump System

DESCRIPTION

The injection or supply pump assembly is a single-type pump and has a circuit for fuel suction that achieves high pressure force feed and reduction of driving torque, and for force feed process. The ECM controls the suction control valve, which operates fuel suction by the plunger in the process of suction.

When the internal fuel pressure of the common rail assembly exceeds the target pressure, the pressure limiter on the common rail assembly starts operating to control the internal fuel pressure of the common rail assembly.

P0088
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After idling for 60 seconds, quickly increase engine speed to 2500 rpm repeatedly for 30 seconds

The fuel pressure of the common rail exceeds 250000 kPa (2549 kgf/cm2, 36250 psi) (1 trip detection logic).

  • Injection or supply pump assembly (suction control valve)

  • Open or short in injection or supply pump assembly (suction control valve) circuit

  • Common rail assembly

  • ECM
P0627
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idling for 1 second Open or short in suction control valve circuit for more than 0.5 seconds (1 trip detection logic).

  • Injection or supply pump assembly (suction control valve)

  • Open or short in injection or supply pump assembly (suction control valve) circuit

  • Common rail assembly

  • ECM
P1229
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
After idling for 60 seconds, quickly increase engine speed to 2500 rpm repeatedly for 30 seconds The actual fuel pressure exceeds the target fuel pressure by 40000 kPa or more for 10 seconds (1 trip detection logic).

  • Injection or supply pump assembly (suction control valve)

  • Open or short in injection or supply pump assembly (suction control valve) circuit

  • Common rail assembly

  • ECM

WIRING DIAGRAM

A01CI6SE09

Refer to DTC P0087 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.

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
      DTC P0180, P0182, P0183, P0190, P0191, P0192, P0193, P0201, P0202, P0203, P0204 or P062D is not output A
      DTC P0180, P0182, P0183, P0190, P0191, P0192, P0193, P0201, P0202, P0203, P0204 or P062D is output B

    B

    GO TO DTC CHART Click here

    A

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


    1. Inspect the injection or supply pump assembly (suction control valve) Click here.


    NG

    CHECK FUEL INJECTION SYSTEM Click here

    OK

  3. CHECK 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
      DTC P0088 and/or P1229 are output A
      DTC P0627 is output B

    B

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

    A

  4. 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

    CHECK FUEL INJECTION SYSTEM Click here

    OK

  5. 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

    NG

    CHECK HARNESS AND CONNECTOR (FUEL PRESSURE SENSOR - ECM) Click here

    OK

  6. 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
      E37-23 (PCV+) - S31-1 (SCV+) Always Below 1 Ω
      E37-12 (PCV-) - S31-2 (SCV-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E37-23 (PCV+) or S31-1 (SCV+) - Body ground Always 10 kΩ or higher
      E37-12 (PCV-) or S31-2 (SCV-) - 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

    OK

  7. CHECK ECM TERMINAL VOLTAGE (PCV+ AND PCV- TERMINAL)


    1. A01CH0RE02
      Text in Illustration
      *a

      Component with harness connected

      (ECM)

      While cranking or idling the engine, check the waveform of the ECM connector using an oscilloscope.

      Standard
      Tester Connection Condition Tool Setting Specified Condition
      E37-23 (PCV+) - E38-1 (E1) Idling or cranking with warm engine 10 V/DIV., 5 ms./DIV. Correct waveform appears as shown
      E37-12 (PCV-) - E38-1 (E1) Idling or cranking with warm engine 1 V/DIV., 5 ms./DIV. Correct waveform appears as shown

    NG

    REPLACE ECM Click here

    OK

  8. PERFORM INITIALIZATION (INJECTION OR SUPPLY PUMP ASSEMBLY)


    1. Perform initialization Click here.


    NEXT

  9. CHECK WHETHER DTC OUTPUT RECURS


    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. Clear the DTCs.

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

    7. Read the DTCs.

      Result
      Result Proceed to
      DTC P0088, P0627 or P1229 is output A
      DTC is not output B

    B

    END

    A

    CHECK FUEL INJECTION SYSTEM Click here

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


    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
      E36-13 (VC) - C12-1 (VC1) Always Below 1 Ω
      E35-16 (PCR1) - C12-2 (PCR1) Always Below 1 Ω
      E36-14 (E2) - C12-3 (E1) Always Below 1 Ω
      E35-13 (VC2) - C12-6 (VC2) Always Below 1 Ω
      E35-2 (PCR2) - C12-5 (PCR2) Always Below 1 Ω
      E35-14 (E21) - C12-4 (E2) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      E36-13 (VC) or C12-1 (VC1) - Body ground Always 10 kΩ or higher
      E35-16 (PCR1) or C12-2 (PCR1) - Body ground Always 10 kΩ or higher
      E35-13 (VC2) or C12-6 (VC2) - Body ground Always 10 kΩ or higher
      E35-2 (PCR2) or C12-5 (PCR2) - 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

    OK

  11. 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

    CHECK FUEL INJECTION SYSTEM Click here