Dtc P244B Diesel Particulate Filter Differential Pressure Too High

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

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

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P244B OR P2465)

READ VALUE USING GTS (DPF DIFFERENTIAL PRESSURE)

CLEAN OR REPLACE VACUUM TRANSMITTING HOSE

CHECK FOR BLACK SMOKE

READ VALUE USING GTS (CATALYST DIFFERENTIAL PRESS)

PERFORM PM FORCED REGENERATION

REPLACE EXHAUST PIPE ASSEMBLY (DPF CATALYST CONVERTER)

GO TO DTC CHART

CHECK FUEL INJECTION SYSTEM

CHECK INTAKE / EXHAUST SYSTEM

CHECK AFTER TREATMENT CONTROL SYSTEM

REPAIR OR REPLACE MALFUNCTIONING PARTS

CATALYST RECORD CLEAR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

NOTICE:

1. After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).
   
2. After replacing the fuel supply pump assembly, the ECM needs initialization (Click here).
   
3. After replacing an injector assembly, the ECM needs registration (Click here).
   

HINT:

Read freeze frame data using the GTS. 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. Connect the GTS to the DLC3.
   

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

3. Enter the following menus: Engine and ECT / Trouble Codes.
   

4. Record the stored DTC and freeze frame data.
   

5. Check Exhaust Fuel Addition FB, Exhaust Fuel Addition FB #2, Catalyst Differential Press and Catalyst Differential Press #2 in the freeze frame data.
   

   HINT:

   1. When the Exhaust Fuel Addition FB and Exhaust Fuel Addition FB #2 values are 1.45 or more, it indicates a high possibility of insufficient temperature increase during PM forced regeneration.
      
   2. When the Catalyst Differential Press and Catalyst Differential Press #2 values are 0.45 or more, it indicates a high possibility that the DPF catalyst is clogged.
      

1. Connect the GTS to the DLC3.
   

2. Turn the ignition switch to ON.
   

3. Turn the GTS on.
   

4. Enter the following menus: Engine and ECT / Trouble Codes.
   

5. Read the DTCs.
   
   

   Result

   Result	Proceed to
   P244B or P2465 is output	A
   P244B or P2465 is output at the same time as P2463*
   Other relevant DTCs are output	B

   HINT:

   *: When P244B or P2465 is output at the same time as P2463, perform this diagnostic procedure. When DTC P244B or P2465 is not output at the same time as P2463 is output, perform the diagnostic procedure for P244C or P244E (Click here).

1. Connect the GTS to the DLC3.
   

2. Start the engine and turn the GTS on.
   

3. Enter the following menus: Engine and ECT / Data List / DPF Differential Pressure and DPF Differential Pressure #2.
   

4. Check the DPF Differential Pressure and DPF Differential Pressure #2 values from idle speed to unloaded maximum engine speed.
   
   

   Result

   Result	Proceed to
   DPF Differential Pressure and DPF Differential Pressure #2 increase as engine speed increases from idle speed	A
   Except above	B

   
   
   
   

   HINT:

   If DPF Differential Pressure and DPF Differential Pressure #2 indicate negative pressure for approx. 1 second as shown in the illustration (A) when the engine speed increases, the differential pressure sensor piping of the DPF catalyst may be clogged.

1. Even though it has been determined that the vacuum transmitting hose needs to be repaired or cleaned, make sure to perform all diagnostic procedures for DTC P244B or P2465 before repairing or cleaning it.
   

1. Start the engine and drive the vehicle until the engine coolant temperature reaches 75°C (167°F) or higher.
   

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

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

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

5. 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.

1. Connect the GTS to the DLC3.
   

2. Start the engine and turn the GTS on.
   

3. Enter the following menus: Powertrain / Engine and ECT / Data List / Catalyst Differential Press and Catalyst Differential Press #2.
   

4. Check the value of Catalyst Differential Press and Catalyst Differential Press #2 at 4000 rpm without load.
   
   

   Result

   Result	Proceed to
   Catalyst Differential Press or Catalyst Differential Press #2 is more than 0.45	A
   Except above	B

1. Remove the EFI MAIN fuse or disconnect the cable from the battery terminal for 60 seconds or more, and then reinstall the EFI MAIN fuse or reconnect the cable to the battery terminal.
   

   HINT:

   1. The amount of built up particulate matter recorded by the ECM cannot be initialized by the GTS.
      
   2. If the amount of built up particulate matter recorded by the ECM is not initialized, PM forced regeneration cannot be performed using the GTS.
      

2. Connect the GTS to the DLC3.
   

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

4. Clear the DTCs (Click here).
   

5. Start the engine.
   

6. Enter the following menus: Engine and ECT / Data List / Coolant Temp.
   

7. Warm up the engine (engine coolant temperature is 70°C (158°F) or higher).
   

8. Perform PM forced regeneration (Click here).
   

9. Turn the ignition switch off.
   

1. Perform inspection and repair of relevant DTCs (Click here).
   

1. Check the fuel injection system (Click here).
   

1. Check the intake/exhaust system (Click here).
   

1. Check the after treatment control system (Click here).
   

HINT:

1. Repair, replace or clean the following items only when it has been determined necessary based on diagnosis for DTC P244B or P2465.
   
2. Replace the DPF catalytic converter for bank 1 and bank 2 at the same time.
   

1. Clean and/or repair the hoses of the differential pressure sensor (for bank 1).
   
2. Replace the exhaust pipe assembly (for bank 1 DPF catalytic converter) (Click here).
   
3. Replace the front No. 2 exhaust pipe assembly (for bank 2 DPF catalytic converter) (Click here).
   

1. Clean and/or repair the hoses of the differential pressure sensor (for bank 2).
   
2. Replace the exhaust pipe assembly (for bank 1 DPF catalytic converter) (Click here).
   
3. Replace the front No. 2 exhaust pipe assembly (for bank 2 DPF catalytic converter) (Click here).
   

1. Perform the catalyst record clear (Click here).
   

1. Connect the GTS to the DLC3.
   

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

3. Clear the DTCs (Click here).
   

4. Perform PM forced regeneration (Click here).