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.

DTC No. DTC Detection Condition Trouble Area
P0088

Conditions (a) and (b) are met 4 times or more:

(a) Ignition switch to ON

(b) Internal fuel pressure of the common rail: 212 MPa (1947 kg/cm2, 27692 psi) or more

  • 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 Open or short in suction control valve circuit for more than 0.5 seconds

  • 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

Fuel over-feed:

Internal fuel pressure is beyond target fuel pressure despite ECM closing suction control valve

  • 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

A01CI6SE07

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. Rear the DTCs.

      Result
      Result Proceed to
      DTC P0180, P0182, P0183, P0190, P0192, P0193 or P0200 is not output A
      DTC P0180, P0182, P0183, P0190, P0192, P0193 or P0200 is output B

    B

    GO TO DTC CHART Click here

    A

  2. 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

  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. 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 (FUEL PRESSURE SENSOR)


    1. Disconnect the fuel pressure sensor 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
      E22-26 (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 (FUEL PRESSURE SENSOR - ECM)

    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

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY Click here

  9. 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

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


    1. A01CIRVE07
      Text in Illustration
      *1

      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
      E22-2 (PCV+) - E23-7 (E1) Idling or cranking with warm engine 5 V/DIV., 5 ms./DIV. Correct waveform appears as shown
      E22-1 (PCV-) - E23-7 (E1) Idling or cranking with warm engine 1 V/DIV., 5 ms./DIV. Correct waveform appears as shown

    NG

    REPLACE ECM Click here

    OK

  11. PERFORM INITIALIZATION (INJECTION OR SUPPLY PUMP ASSEMBLY)


    1. Perform initialization Click here.


    NEXT

  12. 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

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY Click here