C13, C15, and C18 Engines Troubleshooting – Diesel Particulate Filter Has Changed Regeneration Interval

Note: Refer to this procedure if the interval between DPF regenerations has changed.

Table 1
Troubleshooting Test Steps Values Results
1. Check the Regeneration HistoryA. Connect Caterpillar 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 regenerationPerform 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.

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.

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.

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).

Complete the procedure in the order in which the steps are listed.

The procedure corrected the issue. Return the engine to service.

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).

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