OPERATOR AS 7W0620 - 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 the electronic service tool and the Electronic Control Module (ECM).
B. Determine the code.
Active Code
Result: A 3720–15 (E997 (1)) code is active.
Proceed to Test Step 2.
Result: A 3720–16 (E997 (2)) code 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, "Service Tool Features" 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 Systems Operation and Testing and Adjusting, "Diesel Particulate Filter - Clean" for the correct procedure.
Note: 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 fault is resolved.