Dtc P1229 Fuel Pump System

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK OTHER DTC OUTPUT

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

CHECK HARNESS AND CONNECTOR (SUCTION CONTROL VALVE - ECM)

REPAIR OR REPLACE HARNESS OR CONNECTOR

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (TEST THE FUEL LEAK)

CLEAN FUEL FILTER CASE AND REPLACE FUEL FILTER

REPLACE FUEL SUPPLY PUMP ASSEMBLY (SUCTION CONTROL VALVE)

BLEED AIR FROM FUEL SYSTEM

PERFORM FUEL SUPPLY PUMP INITIALIZATION

CHECK 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 (HILUX_TGN26 RM0000012WW02QX.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 after warm up the engine, 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. Inspect the fuses of circuits related to this system before performing the following inspection procedure.
   
2. After replacing the ECM, the new ECM needs registration (HILUX_TGN26 RM0000012XK071X.html) and initialization (HILUX_TGN26 RM000000TIN04FX.html).
   
3. After replacing the fuel supply pump assembly, the ECM needs initialization (HILUX_TGN26 RM000000TIN04FX.html).
   
4. After replacing an injector assembly, the ECM needs registration (HILUX_TGN26 RM0000012XK071X.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. Read the DTCs.
   
   

   Result

   Result	Proceed to
   P1229 and "P0190, P0192 and/or P0193" are output	B
   Except above	A

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.
   

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
   C5-1 - C22-2 (PCV+)	Always	Below 1 Ω
   C5-2 - C22-1 (PCV-)	Always	Below 1 Ω
   C5-1 or C22-2 (PCV+) - Body ground	Always	10 kΩ or higher
   C5-2 or C22-1 (PCV-) - Body ground	Always	10 kΩ or higher

4. Reconnect the suction control valve connector.
   

5. Reconnect the ECM connector.
   

1. Repair or replace the harness or connector.
   

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

   Text in Illustration

   *1	Snapshot Button

   HINT:

   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 (HILUX_TGN26 RM0000012X1051X.html).
   

   HINT:

   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.

   
   
   
   

   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.
   

   HINT:

   1. "Target Common Rail Pressure" is the target fuel pressure controlled by the ECM.
      
   2. "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

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

   HINT:

   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.

1. Replace the fuel supply pump assembly (HILUX_TGN26 RM0000014FO02AX.html).
   

1. Bleed the air from the fuel system (HILUX_TGN26 RM000002SY8026X_01_0002.html).
   

1. Perform fuel supply pump initialization (HILUX_TGN26 RM000000TIN04FX.html).
   

1. Connect the intelligent tester to the DLC3.
   

2. Clear the DTCs (HILUX_TGN26 RM000000PDK120X.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.