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

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DTC Code DTC Name
P1229 Fuel Pump System
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DESCRIPTION

Refer to the System Description (Click here).

Table 1. P1229
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Idling for 60 seconds The actual fuel pressure exceeds the target fuel pressure by 40 MPa or more for 10 seconds (1 trip detection logic).

  • Short in fuel supply pump (suction control valve) circuit

  • Fuel supply pump (suction control valve)

  • Fuel pressure sensor (common rail (for Bank 1))

  • ECM
Table 2. Related Data List
DTC No. Data List
P1229

  • Fuel Press

  • Target Common Rail Pressure

  • Injection Pressure Correction

  • Target Pump SCV Current
Tip:

  • For more information on the fuel supply pump (suction control valve) and common rail system, refer to the 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 / 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 +/-5 MPa of Target Common Rail Pressure.

  • When there is an operating problem with the fuel supply pump (when Fuel Press is more than Target Common Rail Pressure due to a problem with the closing of the suction valve), the values of Injection Pressure Correction and Target Pump SCV Current decrease.

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MONITOR DESCRIPTION

P1229 (Fuel over-feed):

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 fail-safe mode continues until the ignition switch is turned off.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

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

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

Tip:

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.

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PROCEDURE


  1. Click here

    INSPECT FUEL SUPPLY PUMP (SUCTION CONTROL VALVE)


    1. Disconnect the suction control valve connector and then check if the engine starts.

      OK
      Engine does not start.

  2. Click here

    READ VALUE USING INTELLIGENT TESTER (TARGET PUMP SCV CURRENT)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine.

    3. Turn the tester on.

    4. Enter the following menus: Powertrain / Engine / Data List / Target Pump SCV Current.

    5. Read the value.

      OK
      Engine Speed Target Pump SCV Current
      Idling 923 to 1123 mA
      2500 rpm (No engine load) 1013 to 1212 mA

  3. Click here

    READ VALUE USING INTELLIGENT TESTER (FUEL PRESS)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

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

      OK
      Fuel Press is within +/-5 MPa of Target Common Rail Pressure when engine is idling and running at 2500 rpm without load.

  4. Click here

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


    1. A015A9JE04

      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)
      Table 3. for LHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) - C45-105 (PCV-) Always Below 1 Ω
      z64-1 (+B) - C45-106 (PCV+) Always Below 1 Ω
      Table 4. for RHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) - C46-105 (PCV-) Always Below 1 Ω
      z64-1 (+B) - C46-106 (PCV+) Always Below 1 Ω
      Standard Resistance (Check for short)
      Table 5. for LHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) or C45-105 (PCV-) - Body ground Always 10 kΩ or higher
      z64-1 (+B) or C45-106 (PCV+) - Body ground Always 10 kΩ or higher
      Table 6. for RHD
      Tester Connection Condition Specified Condition
      z64-2 (PCV) or C46-105 (PCV-) - Body ground Always 10 kΩ or higher
      z64-1 (+B) or C46-106 (PCV+) - Body ground Always 10 kΩ or higher

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    CHECK WHETHER DTC OUTPUT RECURS


    1. Clear DTCs (Click here).

    2. Connect the intelligent tester to the DLC3.

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

    4. Start the engine.

    5. Idle the engine for 60 seconds.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. Read the DTCs.

      Table 7. Result
      Result Proceed to
      P1229 is output A
      No DTC is output B

  6. Click here

    REPLACE FUEL SUPPLY PUMP


    1. Replace the fuel supply pump (Click here).


  7. Click here

    READ VALUE USING INTELLIGENT TESTER (FUEL PRESS)


    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and turn the tester on.

    3. Enter the following menus: Powertrain / Engine / Data List / Fuel Press.

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

      OK
      Fuel Press is within +/-5 MPa of Target Common Rail Pressure when engine is idling and running at 2500 rpm without load.

  8. Click here

    CHECK WHETHER DTC OUTPUT RECURS


    1. Clear the DTCs (Click here).

    2. Connect the intelligent tester to the DLC3.

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

    4. Start the engine.

    5. Idle the engine for 60 seconds.

    6. Enter the following menus: Powertrain / Engine / DTC.

    7. Read the DTCs.

      Table 8. Result
      Result Proceed to
      P1229 is output A
      No DTC is output B

  9. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  10. Click here

    REPLACE COMMON RAIL (for Bank 1) (FUEL PRESSURE SENSOR)


    1. Replace common rail (for Bank 1) (Click here).


  11. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


  12. Click here

    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.

    4. Start the engine.

    5. Idle the engine for 60 seconds.

    6. Confirm that the DTC is not output again.

      Tip:

      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 / Utility / All Readiness.

      2. Input DTC P1229.

      3. Check that STATUS is NORMAL. If STATUS is INCOMPLETE or UNKNOWN, increase idling time.


  13. Click here

    END