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Table 1
Diagnostic Trouble Codes for Diesel Particulate Filter (DPF) Collects Excessive Soot
J1939 Code Description Notes
3251-16 Particulate Trap Differential Pressure : High - moderate severity (2) The Electronic Control Module (ECM) detects the following conditions:
The differential pressure across the DPF is high for at least 100 seconds. The pressure at which this code becomes active depends on the level of soot indicated by the soot model that is calculated by the ECM.
The battery voltage is at least 10 VDC.
If equipped, the warning lamp will flash. The engine will be derated.
3251-0 Particulate Trap Differential Pressure : High - most severe (3) The Electronic Control Module (ECM) detects the following conditions:
The differential pressure across the DPF is very high for at least 100 seconds. The pressure at which this code becomes active depends on the level of soot indicated by the soot model that is calculated by the ECM.
The battery voltage is at least 10 VDC.
If equipped, the warning lamp will flash and the shutdown lamp will come on.
3719-0 Aftertreatment 1 Diesel Particulate Filter Soot Load Percent : High - most severe (3) The ECM detects that the soot level in the DPF is high.
The warning lamp will come on.
3719-16 Aftertreatment 1 Diesel Particulate Filter Soot Load Percent : High - moderate severity (2) The ECM detects that the soot load in the DPF is very high.
The warning lamp will flash. The engine may be derated. The Electronic Control Module (ECM) uses the Diesel Particulate Filter (DPF) differential pressure sensor to monitor the soot load in the DPF. An excessive accumulation of soot in the DPF can be caused by the following faults:Probable Causes
Faulty injectors
Configuration of the machine idle status
Incorrect Wiring for Temperature Sensors
Individual malfunctioning cylinders
Low exhaust gas temperature
A faulty valve in the NOx Reduction System (NRS)Recommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.Note: Engine operation must be kept to a minimum to minimize the amount of soot that is created. Follow the troubleshooting procedure to minimize the amount of engine operation.
Table 2
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
A. Establish communication between the electronic service tool and the Electronic Control Module (ECM).
B. Check for active diagnostic codes. Check specifically for codes that relate to the "Probable Causes" in this procedure.
Diagnostic codes
Result: A diagnostic trouble code is active or logged.
Repair: Troubleshoot any related diagnostic codes before continuing with this procedure.
Result: A related diagnostic trouble code is not active or logged.
Proceed to Test Step 2.
2. Configuration of the Machine Idle Status
Note: The engine speed cannot be elevated for regeneration or service tests if the machine idle status is not "Idle".
A. Use the electronic service tool to confirm that the "Machine Idle Status" is "Idle".
Idle status
Result: The "Machine Idle Status" is "Idle".
Proceed to Test Step 3.
Result: The "Machine Idle Status" is not "Idle".
Repair: Check if a wired switch or CAN message is being used for the machine idle status. A wired switch will be connected to J1:59. Refer to the Electrical Schematic for the application.
If a CAN message is being used, refer to Troubleshooting, Data Link - Test to troubleshoot the CAN data link.
If a wired switch is used, check that the switch is configured correctly. Go to "Configuration Tool", then "Configurable Inputs" in the electronic service tool. Confirm that the "Machine Idle Status" configuration is set to "Switch".
When the switch is configured correctly, if the "Machine Idle Status" is still not "Idle", troubleshoot the circuit for the switch. Refer to the Electrical Schematic for the application.
3. Incorrect Wiring for Temperature Sensors
A. Check that the Diesel Oxidation Catalyst (DOC) inlet temperature sensor and DPF inlet temperature sensor wiring has not been switched.
Note: The engine may run without indicating a fault for many hours with this condition.
B. Check that the wiring for the DOC inlet temperature and the DPF inlet temperature sensor is connected to the correct ECM pins.
Refer to the Electrical Schematic for the application.
Wiring
Result: The wiring for the DOC inlet temperature sensor or the DPF inlet temperature sensor is incorrect.
Repair: Repair the faulty wiring or replace the faulty wiring.
Result: The wiring for the DOC inlet temperature sensor and the DPF inlet temperature sensor is OK.
Proceed to Test Step 4.
4. Individual Malfunctioning Cylinders
If the engine will run, perform the following steps.
A. With the engine speed at a fast idle, use the electronic service tool to perform the manual "Cylinder Cut Out Test". As each cylinder is cut out, listen for a change in the sound from the engine. When a cylinder is cut out, there should be a noticeable change in the sound of the engine.
Insulation
Result: There is not a noticeable change in the sound of the engine for at least one cylinder.
Repair: Investigate the cause of the fault on any cylinder that is not operating. Investigate the cause of the fault on any cylinder that is operating below normal performance.
When all faults have been rectified, proceed to Test Step 5.
Result: There is a noticeable change in the sound of the engine for each cylinder.
Proceed to Test Step 5.
5. Exhaust Leaks
A. Thoroughly inspect the exhaust duct between the engine and the CEM for leaks. Ensure that all connections are secure and no leaks are present.
B. Inspect the insulation on the exhaust duct (if equipped) for damage.
Exhaust leaks
Result: There are exhaust leaks. The insulation is damaged.
Repair: Make the necessary repairs. Proceed to Test Step 6.
Result: The exhaust duct is OK.
Proceed to Test Step 6.
6. Manual Regeneration
A. If a 3251-16 or 3719-16 diagnostic code was active, use the electronic service tool to perform a "Particulate Filter Forced Regeneration". Make sure that the high soot loading diagnostic trouble code is no longer active.
B. If a 3251-0 or 3719-0 diagnostic code was active, the DPF must be replaced. Refer to Disassembly and Assembly, "Diesel Particulate Filter - Remove" and refer to Disassembly and Assembly, "Diesel Particulate Filter - Install". Use the electronic service tool to perform the "DPF Replacement Reset".
Complete regeneration
Result: The regeneration completed successfully and there are no active diagnostic codes.
Return the engine to service.
Result: The regeneration did not