CAP AS 8W2842 - Caterpillar

Note: Refer to this procedure if the interval between DPF regenerations has changed.
Table 1
Troubleshooting Test Steps     Values     Results    
1. Check the Regeneration History
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Open the "Information" tab.
C. Open the "History" tab.
D. Open the "Aftertreatment Regeneration History" tab.
E. Verify the following information:
1. If the regeneration intervals have changed
2. If the regeneration was manual or automatic
3. The soot level when the regenerations occurred.
   
Regeneration History    
Result: The engine has logged 5000 hours since the last ash service regeneration
Perform an ash service.
Refer to Special Instruction, REHS5045, "Diesel Particulate Filter (DPF) Maintenance on Tier 4 Products Equipped with a Diesel Particulate Filter (DPF)".
Result: The engine has logged less than 5000 hours since the last ash service regeneration
Proceed to Test Step 2.
   
Illustration 1 g03429629
Illustration 2 g03429630
Table 2
Troubleshooting Test Steps     Values     Results    
2. Inspect for Restrictions
A. Remove the DPF Differential Pressure sensor and lines group, Refer to Illustration 1.
B. Closely inspect the sensors, elbows, lines, and manifold for restrictions. Restrictions could be caused by an accumulation of moisture, ice, or soot. Refer to Illustration 2 for an example of soot accumulation.
   
Restrictions    
Result: Restrictions were found.
Repair: Replace the affected components. Perform a Manual DPF Regeneration using Cat ET to verify that the problem is resolved.
Result: Restrictions were not found.
Proceed to Test Step 3.
   
3. Perform an "EGR System Test"
A. Start the engine.
B. Perform an "EGR System Test" using Cat ET.
    "EGR System Test"    
Result: The "EGR System Test" failed.
Repair: Proceed to Troubleshooting, "NOx Reduction System (NRS) - Test" to troubleshoot the EGR system.
Result: The "EGR System Test" passed.
Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).
   Contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).