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

DTC No. DTC Detection Condition Trouble Area
P0088

Conditions (a) and (b) are met 2 times or more:

(a) Ignition switch in the ON position

(b) Internal fuel pressure of the common rail: 191 MPa (1947 kg/cm2, 27692 psi) or more

  • Supply pump (suction control valve)

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

  • Common rail assembly

  • ECM
P0627 Open or short in suction control valve circuit for more than 0.5 seconds

  • Supply pump (suction control valve)

  • Open or short in supply pump (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

  • Supply pump (suction control valve)

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

  • Common rail assembly

  • ECM

WIRING DIAGRAM

A01CI6SE06

INSPECTION PROCEDURE

Note


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

  • After replacing the supply pump, 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 running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

PROCEDURE


  1. CHECK OTHER DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester on.

    4. Enter the following menu items: Powertrain / Engine and ECT / DTC.

    5. Rear the DTCs.

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

    B

    GO TO DTC CHART

    A

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


    1. A01CGPEE08

      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
      S9-1 - S9-2 20°C (68°F) 1.9 to 2.3 Ω

    3. Reconnect the suction control valve connector.


    NG

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY

    OK

  3. CHECK DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester on.

    4. Enter the following menu items: Powertrain / Engine and ECT / DTC.

    5. Read the DTCs.

      Result
      Display (DTC output) Proceed to
      P0088 and/or P1229 A
      P0627 B

    B

    READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE) 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

    OK

  5. READ VALUE USING INTELLIGENT TESTER (PCV OPEN CURRENT FB VAL)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Enter the following menu items: Powertrain / Engine and ECT / Data List / PCV Open Current FB Val.

    5. Read the value.

      Standard
      Engine Speed Result
      Idling 1050 to 1150 mA

    NG

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY

    OK

  6. READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Enter the following menu items: Powertrain / Engine and ECT / Data List / Fuel Press.

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

      Standard
      Engine Speed Fuel Pressure
      Idling Approximately 25 to 35 MPa
      3000 rpm (No engine load) Approximately 100 to 110 MPa

    OK

    READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE) Click here

    NG

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


    1. A01CJH4E15

      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
      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

  8. READ VALUE USING INTELLIGENT TESTER (FUEL PRESSURE)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Enter the following menu items: Powertrain / Engine and ECT / Data List / Fuel Press.

    5. 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

    OK

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY

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


    1. A01CJH4E15

      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
      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. A01CIRVE06

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

    NG

    REPLACE ECM

    OK

  11. PERFORM INITIALIZATION (INJECTION OR SUPPLY PUMP)


    1. Perform initialization Click here.


    NEXT

  12. CHECK WHETHER DTC OUTPUT RECURS


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to the ON position.

    3. Turn the tester on.

    4. Clear the DTCs.

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

    6. Read the DTCs.

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

    B

    SYSTEM IS OK

    A

    REPLACE INJECTION OR SUPPLY PUMP ASSEMBLY