ECD SYSTEM (w/o DPF), Diagnostic DTC:P0088, P1229

DTC Code DTC Name
P0088 Fuel Rail / System Pressure - Too High
P1229 Fuel Pump System

DESCRIPTION

Refer to the SYSTEM DESCRIPTION Click here.

DTC No. DTC Detection Condition Trouble Area
P0088

Fuel pressure of common rail is too high:

Fuel pressure exceeds 200 MPa (2,039 kgf/cm2, 29,007 psi)

(1 trip detection logic)

  • Suction control valve

  • Pressure discharge valve

  • Short in suction control valve circuit

  • Open in pressure discharge valve circuit

  • ECM
P1229

Fuel over-feed:

Fuel pressure is beyond the target fuel pressure despite ECM closing suction control valve

(1 trip detection logic)

  • Short in suction control valve circuit

  • Suction control valve

  • ECM

Tech Tips


  • For more information on the supply pump (suction control valve) and common rail system, refer to the system description Click here.

  • If P0088 and/or P1229 are present, refer to the diagnostic trouble codes (DTCs) table for common rail system Click here.

  • After confirming DTC P0088 and/or P1229, check the internal fuel pressure of the common rail by selecting the following menu items on an intelligent tester: Powertrain / Engine / Data List / Fuel Press.

    Reference
    Engine Speed Fuel Pressure
    Idling Approximately 30 to 40 MPa
    3,000 rpm (No engine load) Approximately 85 to 105 MPa

MONITOR DESCRIPTION

P0088 (Internal fuel pressure too high):

The ECM sets this DTC if the fuel pressure inside the common rail is more than 200 MPa (2,039 kgf/cm2, 29,007 psi). This DTC indicates that the suction control valve may be stuck open, or there may be short in its circuit, and the pressure discharge valve may be stuck closed, or there may be open in its circuit.

If this DTC is present, the ECM enters the fail-safe mode and limits the engine power. The fail-safe mode continues until the ignition switch is turned to OFF.

P1229 (Fuel over-feed):

The ECM sets this DTC if the actual fuel pressure inside the common rail remains higher than the target fuel pressure, despite the ECM closing the suction control valve. This DTC indicates that the suction control valve may be stuck open, or there may be short in its circuit. Under this condition, the pressure discharge valve operates frequently.

If this DTC is set, the ECM enters fail-safe mode and limits the engine power. The fail-safe mode continues until the ignition switch is turned to OFF.

WIRING DIAGRAM

A01BFNNE01

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using an intelligent tester. Freeze frame data record the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

PROCEDURE


  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0088 AND/OR P1229)


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / DTC.

    4. Read DTCs.

      Result
      Display (DTC Output) Proceed To
      P0088, or P0088 and P1229 A
      P1229 B
      P0190, P0191, P0192, P0193 and/or P1271 C
      P1272 D

    B

    INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE) Click here

    C

    GO TO DTC CHART

    D

    REPLACE COMMON RAIL ASSEMBLY (PRESSURE DISCHARGE VALVE) Click here

    A

  2. READ OUTPUT DTC (SEE IF DTC P1272 IS OUTPUT)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / DTC / Clear.

    4. Clear DTCs.

    5. Start the engine and turn the ignition switch to OFF. Wait for 10 seconds and then restart the engine and turn the ignition switch to OFF again.

    6. Select the following menu items: Powertrain / Engine / DTC.

    7. Read DTCs.

      Result
      Display (DTC Output) Proceed To
      P1272 A
      No output B

    B

    INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE) Click here

    A

  3. REPLACE COMMON RAIL ASSEMBLY (PRESSURE DISCHARGE VALVE)


    NEXT

  4. CHECK WHETHER DTC OUTPUT RECURS (DTC P0088 AND/OR P1229)

    Tech Tips

    After clearing the DTC(s), drive the vehicle at 50 km/h (31 mph) for 5 minutes or more, and then confirm that DTC P0088 and/or P1229 is not present again.


    NEXT

    END

  5. INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01BD5ZE02

      Disconnect the D47 suction control valve connector.

    2. Measure the suction control valve resistance.

      Standard resistance
      Tester Connection Specified Condition
      1 - 2

      1.9 to 2.3 Ω

      20°C (68°F)

    3. Reconnect the suction control valve connector.


    NG

    REPLACE SUCTION CONTROL VALVE

    OK

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P1229)


    1. Connect an intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the tester ON.

    3. Select the following menu items: Powertrain / Engine / DTC / Clear.

    4. Clear DTCs.

    5. Disconnect the D47 suction control valve connector and then start the engine. Wait for 1 minute.

      Tech Tips

      If the engine does not start, the suction control valve is normal. Therefore proceed to step 7.

    6. Select the following menu items: Powertrain / Engine / DTC.

    7. Read DTCs.

      Result
      Display (DTC Output) Proceed To
      No output A
      P1229 B

    B

    REPLACE SUCTION CONTROL VALVE

    A

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


    1. A01BBKLE11

      Disconnect the D47 suction control valve connector.

    2. Disconnect the D1 ECM connector.

    3. Measure the resistance of the wire harness side connector.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      D47-1 - PCV+ (D1-2) Below 1 Ω
      D47-2 - PCV- (D1-1)
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      D47-1 or PCV+ (D1-2) - Body ground 10 kΩ or higher
      D47-2 or PCV- (D1-1) - Body ground

    4. Reconnect the ECM connector.

    5. Reconnect the suction control valve connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT ECM (PCV VOLTAGE)


    1. A01BFM2E19

      Inspect the ECM using the oscilloscope.

    2. During cranking or idling, check the waveform between the specified terminals of the D1 ECM connector.

      Standard
      Tester Connection Specified Condition
      PCV+ (D1-2) - PCV- (D1-1) Correct waveform is as shown

    NG

    REPLACE ECM

    OK

  9. CHECK WHETHER DTC OUTPUT RECURS (DTC P0088 AND/OR P1229)

    Tech Tips

    After clearing DTC(s), drive the vehicle at 50 km/h (31 mph) for 5 minutes or more, and then confirm that DTC P0088 and/or P1229 is not present again.


    NEXT

    END