C7.1 Engines and Generator Sets Caterpillar

Diesel Particulate Filter Has Low Inlet Pressure

Usage:

C7.1 770

The probable cause of low inlet pressure of the Diesel Particulate Filter (DPF) is an exhaust leak.

Use this procedure if the following event code is active. Refer to Troubleshooting, "Event Codes" for information about event codes.

Note: Some of the following codes may not be applicable for certain applications.

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Table 1
Diagnostic Trouble Codes
J1939 Codes	CDL Code	Code Description (code descriptions may vary)	Comments
3609-17	E1154 (1)	Low DPF #1 Intake Pressure	The code is logged.
3609-18	E1154 (2)	Low DPF #1 Intake Pressure	The code is logged.

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

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Table 2
Troubleshooting Test Steps	Values	Results
1. Inspect the Exhaust System for Leaks A. Inspect the exhaust system for leaks between the exhaust manifold and the Aftertreatment Regeneration Device (ARD) assembly inlet. B. Check the exhaust system for loose connections or open ports.	Exhaust leaks	Result: The exhaust system has leaks. Repair: Repair the exhaust. Return the engine to service. Result: The exhaust system does not have leaks. Proceed to Test Step 2.
2. Inspect the Diesel Particulate Filter A. Inspect the inlet of the DPF. Inspect the DPF for a missing or damaged DPF core.	Damaged DPF core	Result: The DPF has a damaged or missing DPF core. Repair: Replace the damaged DPF or missing DPF core. Return the engine to service.