ROD 4J7617 - Caterpillar

Table 1
Diagnostic Trouble Codes    
J1939 Code    CDL Code    Description    Comments    
3720-15     E997 (1)     High DPF #1 Ash Loading (1)     The diesel particulate filter has not been cleaned according to the maintenance interval schedule.    
3720-16     E997 (2)     High DPF #1 Ash Loading (2)     The diesel particulate filter has not been cleaned according to the maintenance interval schedule. Regenerations are occurring more frequently.    Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 2
Troubleshooting Test Steps     Values     Results    
1. Determine the active code,
A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM).
B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
C. Determine the code.
   
Active Code    
Result: A 997 (1) code is active.
Proceed to Test Step 2.
Result: A 997 (2) is active.
Proceed to Test Step 3.
   
2. Determine the Most Recent Cleaning of the DPF.
A. Determine the last time the DPF was cleaned.
   
DPF Cleaning    
Result: The diesel particulate filter has not been cleaned according to the maintenance interval schedule. The maintenance interval schedule is listed in the Operations and Maintenance Manual.
Proceed to Test Step 3.
Result: The diesel particulate filter was cleaned according to the maintenance interval schedule. The diesel particulate filter was cleaned within the last 500 hours but the engine ash model was not reset. Reset the engine ash model. Refer to Troubleshooting, "Cat ET Service Features, DPF Ash Service" for information on resetting the ash model.
Result: The DPF was cleaned according to the Maintenance Manual and more than 500 hours of engine operation has occurred. Also, the engine ash model was not reset.
Proceed to Test Step 3.    
3. Clean the DPF
A. Clean the DPF. Refer to Special Instruction, REHS8180, "Aftertreatment Filter Maintenance on Tier 4 Final Products Equipped with a Diesel Particulate Filter (DPF), Diesel Oxidation Catalyst (DOC) and a Selective Catalyst Reduction (SCR) Filter". Refer to Systems Operation and Testing and Adjusting, "Diesel Particulate Filter - Clean" for the correct procedure.
After an ash service regeneration, there will be a delay in soot accumulation shown on the gauge.
   
DPF    
Result: The DPF was cleaned.
Verify that the problem is resolved.