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

DTC Code DTC Name
P1229 Fuel Pump System

DESCRIPTION

P1229
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idling for 60 seconds The actual fuel pressure exceeds the target fuel pressure by 5000 kPa or more for 10 seconds (1 trip detection logic).

  • Short in suction control valve circuit

  • Suction control valve

  • Fuel pressure sensor (common rail assembly)

  • ECM
Related Data List
DTC No. Data List
P1229

  • Fuel Press

  • Target Common Rail Pressure

  • Injection Pressure Correction

  • Target Pump SCV Current

  • Pump SCV Learning Value

Tech Tips


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

  • When DTC P1229 is stored, check the internal fuel pressure of the common rail by entering the following menus: Powertrain / Engine and ECT / Data List / Fuel Press, Target Common Rail Pressure.

    Under a stable condition such as idling or running the engine at 2500 rpm without load, Fuel Press is within 5000 kPa of Target Common Rail Pressure when normal.

  • When there is a problem with the movement of the fuel supply pump assembly (when Fuel Press is higher than Target Common Rail Pressure due to a problem in which the suction valve has difficulty closing), the values of Injection Pressure Correction and Target Pump SCV Current decrease.

MONITOR DESCRIPTION

P1229 (Fuel overfeed):

The ECM stores 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 a short in its circuit.

If this DTC is stored, the ECM enters fail-safe mode and limits the engine power. The ECM continues operating in fail-safe mode until the ignition switch is turned off.

WIRING DIAGRAM

Refer to DTC P0088 Click here.

INSPECTION PROCEDURE

Note


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

  • After replacing the fuel supply pump assembly, the ECM needs initialization Click here.

Tech Tips


  • Read freeze frame data using the intelligent tester. Freeze frame data records 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, and other data from the time the malfunction occurred.

  • When this DTC is stored, be sure to carefully examine "Fuel Press", "Target Common Rail Pressure", "Target Pump SCV Current", and "Pump SCV Learning Value" in the freeze frame data.

PROCEDURE


  1. READ OUTPUT DTC (RECORD STORED DTC AND FREEZE FRAME DATA)


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Record the stored DTCs and freeze frame data.


    NEXT

  2. CHECK FOR ANY OTHER DTCS OUTPUT


    1. Connect the intelligent tester to the DLC3.

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

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

    4. Read the DTCs.

      Result
      Result Proceed to
      DTC P1229 A
      DTC P1229 and other DTCs B

      Tech Tips

      If any DTCs other than DTC P1229 are output, troubleshoot those DTCs first.


    B

    GO TO DTC CHART Click here

    A

  3. READ VALUE USING INTELLIGENT TESTER (TARGET PUMP SCV CURRENT AND PUMP SCV LEARNING VALUE)


    1. A00OA2RE02

      Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

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

    5. Start the engine.

    6. Turn the tester on.

    7. Enter the following menus: Powertrain / Engine and ECT / Data List / Target Pump SCV Current and Pump SCV Learning Value.

    8. Take a snapshot while driving the vehicle under the conditions indicated by the freeze frame data recorded previously.

    9. Read the values of "Target Pump SCV Current" and "Pump SCV Learning Value" in the Data List using the snapshot review function.

    10. Compare "Target Pump SCV Current" and "Pump SCV Learning Value" of the freeze frame data recorded previously with "Target Pump SCV Current" and "Pump SCV Learning Value" of the Data List.

    11. Read the value.

      Result
      Result Proceed to
      The freeze frame data values are higher than the Data List values by 100 mA or more B
      Except above A

      Tech Tips

      If the Data List values are below the freeze frame data values, the suction control valve may have malfunctioned temporarily.


    B

    REPLACE SUCTION CONTROL VALVE Click here

    A

  4. READ VALUE USING INTELLIGENT TESTER (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Press and target Common Rail Pressure.

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

      OK
      Fuel Press is within 5000 kPa of Target Common Rail Pressure when engine is idling and when engine is running at 2500 rpm without load.

    OK

    CHECK WHETHER DTC OUTPUT RECURS Click here

    NG

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

  5. 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
      C71-1 - C92-23 (PCV+) Always Below 1 Ω
      C71-2 - C92-12 (PCV-) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      C71-1 or C92-23 (PCV+) - Body ground Always 10 kΩ or higher
      C71-2 or C92-12 (PCV-) - 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 Click here

    OK

  6. CHECK WHETHER DTC OUTPUT RECURS


    1. Clear DTCs Click here.

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

    3. Connect the intelligent tester to the DLC3.

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

    5. Start the engine.

    6. Idle the engine for 60 seconds, and then run it at 2500 rpm without load for 60 seconds.

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

    8. Read the DTCs.

      Result
      Result Proceed to
      P1229 is output A
      No DTC is output B

    B

    END

    A

  7. REPLACE SUCTION CONTROL VALVE


    1. Replace the suction control valve Click here.


    NEXT

  8. BLEED AIR FROM FUEL SYSTEM


    1. Bleed the air from the fuel system Click here.


    NEXT

  9. PERFORM FUEL SUPPLY PUMP INITIALIZATION


    1. Perform fuel supply pump initialization Click here.


    NEXT

  10. READ VALUE USING INTELLIGENT TESTER (FUEL PRESS AND TARGET COMMON RAIL PRESSURE)


    1. Connect the intelligent tester to the DLC3.

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

    3. Clear the DTCs Click here.

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

    5. Start the engine and turn the tester on.

    6. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Press and target Common Rail Pressure.

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

      OK
      Fuel Press is within 5000 kPa of Target Common Rail Pressure when engine is idling and when engine is running at 2500 rpm without load.

    NG

    REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR) Click here

    OK

  11. CHECK WHETHER DTC OUTPUT RECURS


    1. Clear the DTCs Click here.

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

    3. Connect the intelligent tester to the DLC3.

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

    5. Start the engine.

    6. Idle the engine for 60 seconds, and then run it at 2500 rpm without load for 60 seconds.

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

    8. Read the DTCs.

      Result
      Result Proceed to
      P1229 is output A
      No DTC is output B

    B

    END

    A

  12. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  13. REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)


    1. Replace the common rail Click here.


    NEXT

  14. BLEED AIR FROM FUEL SYSTEM


    1. Bleed the air from the fuel system Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  15. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  16. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs Click here.

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

    4. Start the engine.

    5. Idle the engine for 60 seconds, and then run it at 2500 rpm without load for 60 seconds.

    6. Confirm that the DTC is not output again.

      Tech Tips

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      2. Input DTC P1229.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or N/A, increase the idling time.


    NEXT

    END