ECD SYSTEM (for 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 higher for 30 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 after warm up the engine, 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


  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.

  • 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.

  • After replacing an injector assembly, the ECM needs registration 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. CHECK OTHER DTC 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
      P1229 and "P0190, P0192 and/or P0193" are output B
      Except above A

    B
    A
  2. 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. Start the engine and warm it up.

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

    5. 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 after warm up the engine.

    NG
    OK
  3. 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
      Tester Connection Condition Specified Condition
      S8-1 - E24-23 (PCV+) Always Below 1 Ω
      S8-2 - E24-12 (PCV-) Always Below 1 Ω
      S8-1 or E24-23 (PCV+) - Body ground Always 10 kΩ or higher
      S8-2 or E24-12 (PCV-) - Body ground Always 10 kΩ or higher
    4. Reconnect the suction control valve connector.

    5. Reconnect the ECM connector.


    OK
    NG
  4. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT
  5. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TEST THE FUEL LEAK)


    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 / Active Test / Test the Fuel Leak / Data List / Fuel Press, Target Common Rail Pressure.

    4. A01DUXVE18
      Text in Illustration
      *1 Snapshot Button

      Take a snapshot with the intelligent tester during the Active Test.

      Tech Tips

      Detailed graphs can be displayed by transferring the stored snapshot from the tester to a PC (personal computer) with Intelligent Viewer installed.

    5. Measure the difference between the target fuel pressure (Target Common Rail Pressure) and the actual fuel pressure (Fuel Press) when the "Test the Fuel Leak" Active Test is performed Click here.

      Tech Tips

      In order to obtain an exact measurement, perform the Active Test 5 times and measure the difference once each time the Active Test is performed.

      A01DZBQE01
      OK
      The difference between the target fuel pressure and the actual fuel pressure 2 seconds after the Active Test starts is less than 10000 kPa.

      Tech Tips


      • "Target Common Rail Pressure" is the target fuel pressure controlled by the ECM.

      • "Fuel Press" is the actual fuel pressure.

      Result
      Result Proceed to
      The difference between the target fuel pressure and the actual fuel pressure 2 seconds after the Active Test starts is less than 10000 kPa. B
      Except above A

    B
    A
  6. CLEAN FUEL FILTER CASE AND REPLACE FUEL FILTER


    1. Clean the fuel filter case and replace the fuel filter.

      Tech Tips

      Be sure to clean the inside of the fuel filter case as the fuel injectors may not operate properly if the fuel filter is installed with foreign matter remaining inside the fuel filter case.


    NEXT
  7. REPLACE FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)


    1. Replace the fuel supply pump assembly 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. CHECK 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