Dtc P244A Diesel Particulate Filter Differential Pressure Too Low

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
1Kd-Ftv Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

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

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P244A, P244C AND P2463)

CHECK FOR BLACK SMOKE

GO TO DTC CHART

CHECK FOR WHITE SMOKE (DURING PM FORCED REGENERATION)

REPLACE FRONT EXHAUST PIPE ASSEMBLY

CHECK FUEL INJECTION SYSTEM

CHECK INTAKE / EXHAUST SYSTEM

CHECK AFTER TREATMENT CONTROL SYSTEM

REPAIR OR REPLACE MALFUNCTIONING PARTS

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P244A Diesel Particulate Filter Differential Pressure Too Low

DTC P244C Exhaust Temperature Too Low for Particulate Filter Regeneration Bank 1

DTC P2463 Diesel Particulate Filter Restriction - Soot Accumulation


DESCRIPTION

DPF (Diesel Particulate Filter) is an emission control system which processes the particulate matter (PM) that is emitted from a diesel engine. The DPF catalyst has a porous ceramic structure which has a PM collecting function. The PM that is collected is continuously treated by oxidation due to catalytic action at high temperatures, however PM accumulation increases at low catalyst temperatures because the oxidation process slows down. The ECM performs PM forced regeneration so that the amount of accumulated PM does not exceed the threshold.

Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P244A Diesel Particulate Filter Differential Pressure Too Low


P244A
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
PM forced regeneration
When PM forced regeneration is manually performed, PM forced regeneration does not finish even after 60 minutes or more elapse.
(1 trip detection logic)
  1. Front exhaust pipe assembly (oxidation catalyst)
  2. Front exhaust pipe assembly (DPF catalyst)
  3. Exhaust fuel addition injector assembly
  4. No. 2 exhaust gas temperature sensor (B1S2)
  5. No. 3 exhaust gas temperature sensor (B1S3)
Common Inspection Item:
  1. Fuel injection system
  2. Intake/Exhaust system
  3. After treatment control system

P244C
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
PM forced regeneration
During PM forced regeneration, catalyst temperature does not increase sufficiently for 3 minutes.
(1 trip detection logic)
  1. Front exhaust pipe assembly (oxidation catalyst)
  2. Front exhaust pipe assembly (DPF catalyst)
  3. Exhaust fuel addition injector assembly
  4. No. 2 exhaust gas temperature sensor (B1S2)
  5. No. 3 exhaust gas temperature sensor (B1S3)
Common Inspection Item:
  1. Fuel injection system
  2. Intake/Exhaust system
  3. After treatment control system

P2463
DTC Detection Drive Pattern
DTC Detection Condition
Trouble Area
PM forced regeneration
While driving, PM accumulation amount exceeds the limit.
(1 trip detection logic)
  1. Front exhaust pipe assembly (oxidation catalyst)
  2. Front exhaust pipe assembly (DPF catalyst)
  3. Exhaust fuel addition injector assembly
  4. No. 2 exhaust gas temperature sensor (B1S2)
  5. No. 3 exhaust gas temperature sensor (B1S3)
Common Inspection Item:
  1. Fuel injection system
  2. Intake/Exhaust system
  3. After treatment control system
HINT:
PM forced regeneration may be prohibited due to a fail-safe operation that is performed when another DTC is stored (including engine output limitation).

Related Data List
DTC No.
Data List
P244A
  1. Exhaust Fuel Addition FB
  2. Catalyst Differential Press
P244C
P2463

MONITOR DESCRIPTION

The ECM monitors the differential pressure between the upstream and downstream of the DPF catalyst and also monitors exhaust gas temperature to detect a malfunction in the DPF catalyst.
  1. Excessive PM accumulation:
    The ECM monitors the PM Accumulation Ratio and when the accumulated PM volume in the DPF catalyst exceeds the limit, the ECM illuminates the MIL.
  1. Abnormal catalyst temperature increase:
    The ECM monitors exhaust gas temperature increase while the exhaust fuel addition injector assembly adds fuel during PM forced regeneration. Exhaust gas temperature increases up to approximately 300 to 500°C (572 to 932°F) during PM forced regeneration. If the temperature does not increase even after a certain amount of time has elapsed, the ECM determines that the DPF catalyst is abnormal and illuminates the MIL.
  1. Catalytic converter differential pressure too low:
    When PM forced regeneration is manually performed, PM forced generation does not finish even after 60 minutes or more elapse, the ECM determines that there is problem with the DPR catalyst and illuminates the MIL.

    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.1Kd-Ftv Engine Control.Ecd System (For Dpf). Dtc P244A Diesel Particulate Filter Differential Pressure Too Low


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 RM0000012XK058X.html) and initialization (HILUX_TGN26 RM000000TIN056X.html).
  3. After replacing the fuel supply pump assembly, the ECM needs initialization (HILUX_TGN26 RM000000TIN056X.html).
  4. After replacing an injector assembly, the ECM needs registration (HILUX_TGN26 RM0000012XK058X.html).
HINT:
  1. If DTC P244A, P244B, P244C or P2463 is stored, fail-safe controls engine power output and PM forced regeneration is prohibited. In this case, PM forced regeneration can be performed after disconnecting the EFI fuse or battery terminal and waiting for 60 seconds or more before connecting it again.
  2. 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.
1.READ OUTPUT DTC (RECORD STORED DTC AND FREEZE FRAME DATA)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Record the stored DTC and freeze frame data.

  1. Check Exhaust Fuel Addition FB and Catalyst Differential Press in the freeze frame data.

    HINT:
    1. When the Exhaust Fuel Addition FB value is 1.41 or more, it indicates a high possibility of insufficient temperature increase during PM regeneration control.
    2. When the Catalyst Differential Press value is 0.45 or more, it indicates a high possibility that DPF catalyst is clogged.

NEXT


2.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P244A, P244C AND P2463)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

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

  1. Read the DTCs.

    Result
    Result
    		Proceed to
    P244A, P244C or P2463 is output
    		A
    P244B is output at the same time as P2463*
    		B
    Other relevant DTCs are output
    		C
    HINT:
    1. *: When P244B is output at the same time as P2463, perform troubleshooting for P244B.
    2. When DTC P1603, P1604 or P1608 is output in addition to P244C, perform troubleshooting for P1603, P1604 or P1608 first.


B
GO TO DTC P244B (HILUX_TGN26 RM000004ID500FX.html)

C
Go to step 4
A


3.CHECK FOR BLACK SMOKE

  1. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or higher.

  1. Stop the vehicle and allow the engine to idle.

  1. Fully depress the accelerator pedal for 5 seconds, and then release it [A].

  1. Repeat the above procedure [A] 10 times [B].

  1. Check for black smoke emission during procedures [A] and [B].

    OK:
    Black smoke is emitted less than 5 times.
    HINT:
    Even if the black smoke is very thin, count the number of black smoke emissions if there is any visible smoke.


OK
Go to step 5

NG
Go to step 6

4.GO TO DTC CHART

  1. Diagnose relevant DTCs (HILUX_TGN26 RM0000031HW030X.html).


NEXT


5.CHECK FOR WHITE SMOKE (DURING PM FORCED REGENERATION)

  1. Connect the intelligent tester to the DLC3.

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

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK0X2X.html).

  1. Start the engine and warm it up until the engine coolant temperature reaches 60°C (140°F) or higher.

  1. Perform PM forced regeneration (HILUX_TGN26 RM00000187701WX_02_0008.html).

  1. Check if excessive white smoke occurs when Exhaust Temperature B1S3 is 300°C (572°F) or more.

    Result
    Result
    		Proceed to
    Excessive smoke occurs during PM forced regeneration (Exhaust Temperature B1S3 is 300°C (572°F))
    		A
    Except below
    		B
    HINT:
    1. When excessive white smoke occurs only during PM forced regeneration, uncombusted fuel passes through due to the deterioration of DPF catalyst is suspected.
    2. When combustion control has a malfunction, deterioration or abnormality of driving performance can be felt despite PM forced regeneration being performed.


B
Go to step 7
A


6.REPLACE FRONT EXHAUST PIPE ASSEMBLY

  1. Even though it has been determined that the front exhaust pipe assembly (DPF catalyst) needs to be replaced, make sure to perform all diagnostic procedures for DTC P244A, P244C and P2463 before replacing it.

    HINT:
    This DTC is stored because an excessive amount of PM has accumulated and resulted in abnormal combustion. It is necessary to diagnose the cause of abnormal PM accumulation and repair the problem. Therefore, do not perform replacement at this time.

NEXT


7.CHECK FUEL INJECTION SYSTEM

  1. Check the fuel injection system (HILUX_TGN26 RM000004KNK00HX.html).


NEXT


8.CHECK INTAKE / EXHAUST SYSTEM

  1. Check the intake/exhaust system (HILUX_TGN26 RM000004KNL00DX.html).


NEXT


9.CHECK AFTER TREATMENT CONTROL SYSTEM

  1. Check the after treatment control system (HILUX_TGN26 RM000004KNM00BX.html).


NEXT


10.REPAIR OR REPLACE MALFUNCTIONING PARTS
HINT:
Replace the following items only when it has been determined necessary based on diagnosis for DTC P244A, P244C and P2463.

  1. Replace the front exhaust pipe assembly (DPF catalyst) (HILUX_TGN26 RM00000456A00CX.html).

  1. Repair or replace the malfunctioning part confirmed in the diagnosis of the fuel injection system, intake/exhaust system and after treatment control system.


NEXT


11.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

  1. Connect the intelligent tester to the DLC3.

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

  1. Clear the DTCs (HILUX_TGN26 RM000000PDK0X2X.html).

  1. Start the engine and warm it up until the engine coolant temperature reaches 60°C (140°F) or higher.

  1. Perform PM forced regeneration (HILUX_TGN26 RM00000187701WX_02_0008.html).


NEXT

END