ECD SYSTEM, Diagnostic DTC:P244A, P244C, P2463

DTC Code	DTC Name
P244A	Diesel Particulate Filter Differential Pressure Too Low
P244C	Exhaust Temperature Too Low for Particulate Filter Regeneration Bank 1
P2463	Diesel Particulate Filter Restriction - Soot Accumulation

DESCRIPTION

DPNR (Diesel Particulate-NOx Reduction System) is an emission control system which processes the particulate matter (PM) that is emitted from a diesel engine. The DPNR 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.

Reference
*1	Oxidation Catalyst
*2	Enlarged Illustration
*3	Exhaust Gas
*4	DPNR Catalyst

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)	Oxidation catalytic converter (Exhaust manifold converter sub-assembly) DPNR catalytic converter (Exhaust manifold converter sub-assembly) Exhaust fuel addition injector assembly Common Inspection Item: Fuel injection system Intake/Exhaust 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)	Oxidation catalytic converter (Exhaust manifold converter sub-assembly) DPNR catalytic converter (Exhaust manifold converter sub-assembly) Exhaust fuel addition injector assembly Common Inspection Item: Fuel injection system Intake/Exhaust 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)	Oxidation catalytic converter (Exhaust manifold converter sub-assembly) DPNR catalytic converter (Exhaust manifold converter sub-assembly) Exhaust fuel addition injector assembly Common Inspection Item: Fuel injection system Intake/Exhaust system

Tech Tips

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	Exhaust Fuel Addition FB Catalyst Differential Press Exhaust Temperature B1S2
P244C
P2463

MONITOR DESCRIPTION

The ECM monitors the differential pressure between the upstream and downstream of the DPNR catalyst and also monitors exhaust gas temperature to detect a malfunction in the DPNR catalyst.

Excessive PM accumulation:
The ECM monitors the PM Accumulation Ratio and when the accumulated PM volume in the DPNR catalyst exceeds the limit, the ECM illuminates the MIL.

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 DPNR catalyst is abnormal and illuminates the MIL.

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 DPNR catalyst and illuminates the MIL.

CAUTION / NOTICE / HINT

Note

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

Tech Tips

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 MAIN No. 2 fuse or battery terminal and waiting for 60 seconds or more before connecting it again.
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.

PROCEDURE

READ OUTPUT DTC (RECORD STORED DTC AND FREEZE FRAME DATA)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester on.
4. Enter the following menus: Powertrain / Engine and ECT / DTC.
5. Record the stored DTC and freeze frame data.
6. Check Exhaust Fuel Addition FB and Catalyst Differential Press in the freeze frame data.
  Tech Tips
  - When the Exhaust Fuel Addition FB value is 1.45 or more, it indicates a high possibility of insufficient temperature increase during PM regeneration control.
  - When the Catalyst Differential Press value is 0.37 or more, it indicates a high possibility that DPNR catalyst is clogged.
NEXT

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

Connect the intelligent tester to the DLC3.
Turn the ignition switch to ON.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / DTC.

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

Tech Tips

*: When P244B is output at the same time as P2463, perform troubleshooting for P244B.
When DTC P1603, P1604 or P1608 is output in addition to P244C, perform troubleshooting for P1603, P1604 or P1608 first.

CHECK FOR BLACK SMOKE Click here

GO TO DTC P244B Click here

GO TO DTC CHART
1. Diagnose relevant DTCs Click here.
NEXT
CHECK FOR BLACK SMOKE
1. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°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.
  
  Tech Tips
  
  Even if the black smoke is very thin, count the number of black smoke emissions if there is any visible smoke.
OK
CHECK FOR WHITE SMOKE (DURING PM FORCED REGENERATION) Click here

NG
REPLACE DPNR CATALYTIC CONVERTER
1. Even though it has been determined that the DPNR catalytic converter (Exhaust manifold converter sub-assembly) needs to be replaced, make sure to perform all diagnostic procedures for DTC P244A, P244C and P2463 before replacing it.
  
  Tech Tips
  
  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

OK
Black smoke is emitted less than 5 times.

CHECK FOR WHITE SMOKE (DURING PM FORCED REGENERATION)

Clear the DTC and Exhaust Fuel Addition FB value by disconnecting the cable from the negative (-) battery terminal or removing the EFI MAIN No. 2 fuse for 60 seconds or more.
Tech Tips
- The accumulated PM volume stored in the ECM cannot be initialized using the intelligent tester.
- To perform PM forced regeneration, it is necessary to perform initialization of the accumulated PM volume stored in the ECM.
Connect the intelligent tester to the DLC3.
Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or more.
Move the shift lever to N and set the parking brake.
Turn the tester on.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM) / Data List / / Diesel Exhaust / Exhaust Temperature B1S2.
Perform the Active Test while the vehicle is driven at a constant vehicle speed within 50 to 100 km/h (31 to 62 mph) (transmission in 3rd gear) for more than 15 minutes.

Tech Tips

While the "Activate the DPF Rejuvenate (PM)" Active Test is being performed, the accelerator opening angle should be kept as constant as possible.

CAUTION:

Be aware of excessive heat on and around the exhaust pipes during PM forced regeneration.

Note

If PM forced regeneration stops, repair the malfunction that caused it to stop, and perform it again to complete the operation.
Tech Tips
- PM forced regeneration completes in 15 to 40 minutes.
- PM forced regeneration time changes depending on PM Accumulation Ratio and driving conditions.
- A fail-safe stops PM forced regeneration if Catalyst Differential Press increases too much during regeneration
- Exhaust Temperature B1S2 becomes 500°C (932°F) or more within 20 minutes of PM forced regeneration start.
- PM forced regeneration will be stopped if the accelerator pedal is depressed during regeneration. In this case, PM forced regeneration needs to be performed again.
- Even if PM forced regeneration stops while it is occurring, the intelligent tester displays Compl (complete) for DPNR/DPF Status Reju (PM).

Check if the temperature increases or abnormal white smoke occurs during PM forced regeneration.

Result

Result	Proceed to
No abnormal white smoke occurs but the temperature of Exhaust Temperature B1S2 does not reach 450°C (842°F) or higher during PM forced regeneration	A
Abnormal white smoke occurs and the temperature of Exhaust Temperature B1S2 reaches 300°C (572°F) or higher during PM forced regeneration	B
Except above*	C

Tech Tips

When excessive white smoke occurs only during PM forced regeneration, uncombusted fuel passes through due to the deterioration of DPNR catalyst is suspected.
When combustion control has a malfunction, deterioration or abnormality of driving performance can be felt despite PM forced regeneration.
If Exhaust Temperature B1S2 does not reach 450°C (842°F) or higher, the exhaust fuel addition injector assembly may be clogged.
*: Excessive accumulation of PM is caused by a worsening in combustion conditions and an increase in black smoke due to a malfunction in the control system.

REPLACE DPNR CATALYTIC CONVERTER Click here

CHECK FUEL INJECTION SYSTEM Click here

REPLACE EXHAUST FUEL ADDITION INJECTOR ASSEMBLY
1. Even though it has been determined that the exhaust fuel addition injector assembly needs to be replaced, make sure to perform all diagnostic procedures for DTC P244A, P244C and P2463 before replacing it.
NEXT
CHECK FUEL INJECTION SYSTEM Click here
REPLACE DPNR CATALYTIC CONVERTER
1. Even though it has been determined that the DPNR catalytic converter (Exhaust manifold converter sub-assembly) needs to be replaced, make sure to perform all diagnostic procedures for DTC P244A, P244C and P2463 before replacing it.
  
  Tech Tips
  
  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
CHECK FUEL INJECTION SYSTEM
1. Check the fuel injection system Click here.
NEXT
CHECK INTAKE / EXHAUST SYSTEM
1. Check the intake/exhaust system Click here.
NEXT
REPAIR OR REPLACE MALFUNCTIONING PARTS

Tech Tips

Replace the following items only when it has been determined necessary based on diagnosis for DTC P244A, P244C and P2463.
1. Replace the DPNR catalytic converter (Exhaust manifold converter sub-assembly) Click here.
  
  Note
  
  Perform Initialization procedure for DPNR catalyst record clear Click here.
2. Replace the exhaust fuel addition injector assembly Click here.
3. Repair or replace the malfunctioning part confirmed in the diagnosis of the fuel injection system and intake/exhaust system.
NEXT
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
1. Clear the DTC and Exhaust Fuel Addition FB value by disconnecting the cable from the negative (-) battery terminal or removing the EFI MAIN No. 2 fuse for 60 seconds or more.
  Tech Tips
  - The accumulated PM volume stored in the ECM cannot be initialized using the intelligent tester.
  - To perform PM forced regeneration, it is necessary to perform initialization of the accumulated PM volume stored in the ECM.
2. Connect the intelligent tester to the DLC3.
3. Start the engine and drive the vehicle until the engine coolant temperature reaches 60°C (140°F) or more.
4. Move the shift lever to N and set the parking brake.
5. Turn the tester on.
6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the DPF Rejuvenate (PM) / Data List / Diesel Exhaust / PM Accumulation Ratio.
7. Perform the Active Test while the vehicle is driven at a constant vehicle speed within 50 to 100 km/h (31 to 62 mph) (transmission in 3rd gear) for more than 15 minutes.
  Tech Tips
  - While the "Activate the DPF Rejuvenate (PM)" Active Test is being performed, the accelerator opening angle should be kept as constant as possible.
  - When you start driving, "DPNR/DPF Status Reju (PM)" on the Data List displays "Compl". However, continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.
  - Once "PM Accumulation Ratio" drops to 0%, regeneration is complete.
8. Continue to drive the vehicle until "PM Accumulation Ratio" drops to 0%.
  
  CAUTION:
  
  Be aware of excessive heat on and around the exhaust pipes during PM forced regeneration.
  
  Note
  
  If PM forced regeneration stops, repair the malfunction that caused it to stop, and perform it again to complete the operation.
  Tech Tips
  - PM forced regeneration completes in 15 to 40 minutes.
  - PM forced regeneration time changes depending on PM Accumulation Ratio and driving conditions.
  - A fail-safe stops PM forced regeneration if Catalyst Differential Press increases too much during regeneration
  - Exhaust Temperature B1S2 becomes 500°C (932°F) or more within 20 minutes of PM forced regeneration start.
  - PM forced regeneration will be stopped if the accelerator pedal is depressed during regeneration. In this case, PM forced regeneration needs to be performed again.
  - Even if PM forced regeneration stops while it is occurring, the intelligent tester displays Compl (complete) for DPNR/DPF Status Reju (PM).
NEXT
END