C13, C15, and C18 Tier 4 Interim Engines Exhaust Has Black Smoke Caterpillar

Table 1
Troubleshooting Test Steps	Values	Results
1. Failed DPF The outlet side of the DPF is the only side that can be used to determine a failure. A. Remove the DPF and check for signs of a failure. Refer to Illustration 1 for an example of an obvious failure. Most failures are not obvious. Refer to Special Instruction, SEBF9223, "Diesel Particulate Filter Reuse Guidelines" for additional information.	DPF	Result: There are no signs of failure. Repair: Reinstall the DPF. Return the unit to service. Result: There are signs of failure. Repair: Reinstall the failed DPF and Proceed to Test Step 2.
2. Diagnostic Codes A. Check for any logged or active codes associated with high soot loading.	Codes	Result: There are no codes present. Proceed to Test Step 3. Result: There are codes present. Repair: Troubleshoot the codes before continuing with this procedure.
3. Perform the Automatic Cylinder Cutout Test using Cat ET. A. Perform the Automatic Cylinder Cutout Test.	Cylinder Cutout Test	Result: The test was successful. Proceed to Test Step 4. Result The test was not successful. Repair: Make the necessary repairs, Proceed to Test Step 6.
4. Check for Boost Pressure Leaks A. Check for boost pressure leaks.	Leaks	Result There are leaks found. Repair: Repair the boost pressure leaks. Proceed to Test Step 6. Result There are no leaks found. Proceed to Test Step 5.
5. Inspect the Turbocharger A. Check for boost pressure leaks. Refer to Testing and Adjusting, "Turbocharger - Inspect" for additional information.	Turbocharger	Result The turbocharger is OK. Proceed to Test Step 6. Result The turbocharger is not OK. Repair: Replace the turbocharger and Proceed to Test Step 6.
6. Perform the ARD Ignition Test A. Perform an ARD ignition test using Cat ET to verify the correct operation of the Clean Emissions Module (CEM). The ASH model must be reset if a new DPF is installed. B. If the DPF has failed, replace the DPF. Reset the ASH model in Cat ET. Refer to Troubleshooting, "Electronic Technician Service Features, DPF ASH Service" for additional information.	ARD Ignition Test	Result The test was successful. Return the unit to service.

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).