ECD SYSTEM (w/ EGR Cooler Bypass Valve), Diagnostic DTC:P0088, P1229

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

DESCRIPTION

Tech Tips


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

  • If P0088 and/or P1229 is present, refer to the "Diagnostic Trouble Code (DTC) Table for Common Rail System" Click here.

DTC No. DTC Detection Condition Trouble Area
P0088

Internal fuel pressure of common rail assembly 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

  • Opening in fuel pressure sensor circuit

  • Fuel pressure sensor

  • ECM
P1229

Fuel over-feed:

Internal fuel pressure continues exceeding 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

When DTC P0088 and/or P1229 is set, check the internal fuel pressure of the common rail by entering the following menus on the intelligent tester: Powertrain / Engine and ECT / Data List / Fuel Press.

Standard
Engine Speed Fuel Pressure
Idling Approximately 30,000 to 40,000 kPa
3,000 rpm (No engine load) Approximately 45,000 to 90,000 kPa

MONITOR DESCRIPTION



WIRING DIAGRAM

A01KHP8E04

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, and other data from the time the malfunction occurred.

Note

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

PROCEDURE


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


    1. Connect the intelligent tester to the DLC3.

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

    3. Select the following menus: Powertrain / Engine and ECT / DTC.

    4. Read DTCs.

      Result
      Display (DTC Output) Proceed to
      P0088, or P0088 and P1229 A
      P1229 B
      P0088 or P1229 and other DTCs C

    B

    INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE) Click here

    C

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING INTELLIGENT TESTER (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 menus: Powertrain / Engine and ECT / DTC / Clear.

    4. Clear DTCs Click here.

    5. Turn the ignition switch off for 30 seconds or more.

    6. Start the engine and turn the ignition switch off.

    7. Select the following menus: Powertrain / Engine and ECT / DTC / Pending.

    8. Read pending DTCs.

      Result
      Display (Pending DTCs) 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)

    Replace common rail assembly Click here.


    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, and then confirm that P0088 and/or P1229 is not present again.


    NEXT

    END

  5. INSPECT SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. A01KGU2E10
      Text in Illustration
      *1 Suction Control Valve

      Disconnect the S11 suction control valve connector.

    2. Measure the resistance of the suction control valve.

      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 SUCTION CONTROL VALVE Click here

    OK

  6. CHECK WHETHER DTC OUTPUT RECURS (DTC P1229)


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear DTCs Click here.

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

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

    6. Read DTCs.

      Result
      Display (DTC Output) Proceed to
      No output or engine does not start A
      P1229 B

    7. Reconnect the suction control valve connector.


    B

    REPLACE SUCTION CONTROL VALVE Click here

    A

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


    1. Disconnect the S11 suction control valve connector.

    2. Disconnect the E11 ECM connector.

    3. Check the resistance.

      Standard resistance (Check for open)
      Tester Connection Specified Condition
      S11-1 (Suction control valve) - E11-23 (PCV+) Below 1 Ω
      S11-2 (Suction control valve) - E11-12 (PCV-) Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Specified Condition
      S11-1 (Suction control valve) or E11-23 (PCV+) - Body ground 10 kΩ or higher
      S11-2 (Suction control valve) or E11-12 (PCV-) - Body ground 10 kΩ or higher

    4. Reconnect the ECM connector.

    5. Reconnect the suction control valve connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT ECM (PCV SIGNAL)


    1. A01KFFDE03
      Text in Illustration
      *1 ECM Connector

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

      OK
      Correct waveform is shown
      Tester Connection Specified Condition
      PCV+ (E6-2) - PCV- (E6-1) Correct waveform is shown
      Tool Setting Condition
      10 V/DIV., 5 msec./DIV. Idling or cranking with warm engine

      Tech Tips


      • The waveform varies depending on the suction control valve operation.

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


    NG

    REPLACE ECM Click here

    OK

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