Dtc P1229 Fuel Pump System

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK FOR ANY OTHER DTCS OUTPUT

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

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

CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM)

CHECK WHETHER DTC OUTPUT RECURS

REPLACE SUCTION CONTROL VALVE

BLEED AIR FROM FUEL SYSTEM

PERFORM FUEL SUPPLY PUMP INITIALIZATION

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

CHECK WHETHER DTC OUTPUT RECURS

REPLACE ECM

REPLACE COMMON RAIL ASSEMBLY (FUEL PRESSURE SENSOR)

BLEED AIR FROM FUEL SYSTEM

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DESCRIPTION

HINT:

1. For more information on the fuel supply pump assembly (suction control valve) and common rail system, refer to System Description (LandCruiser RM000000XSN04LX.html).
   
2. 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.
   
3. 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

1. 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

INSPECTION PROCEDURE

NOTICE:

1. After replacing the ECM, the new ECM needs registration (LandCruiser RM0000012XK0ARX.html) and initialization (LandCruiser RM000000TIN08CX.html).
   
2. After replacing the fuel supply pump assembly, the ECM needs initialization (LandCruiser RM000000TIN08CX.html).
   

HINT:

1. 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.
   
2. 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.
   

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.
   

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

   HINT:

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

1. Connect the intelligent tester to the DLC3.
   

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

3. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).
   

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

    HINT:

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

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.
   

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.
   

1. Clear DTCs (LandCruiser RM000000PDK1DJX.html).
   

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

1. Replace the suction control valve (LandCruiser RM000004MF600KX.html).
   

1. Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).
   

1. Perform fuel supply pump initialization (LandCruiser RM000000TIN08CX.html).
   

1. Connect the intelligent tester to the DLC3.
   

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

3. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).
   

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.
   

1. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).
   

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

1. Replace the ECM (LandCruiser RM0000013Z002CX.html).
   

1. Replace the common rail (LandCruiser RM0000044W3015X.html).
   

1. Bleed the air from the fuel system (LandCruiser RM000002SY803CX_01_0002.html).
   

1. Repair or replace the harness or connector.
   

1. Connect the intelligent tester to the DLC3.
   

2. Clear the DTCs (LandCruiser RM000000PDK1DJX.html).
   

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.
   

   HINT:

   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.