C7.1 Engines and Generator Sets Caterpillar

Diesel Particulate Filter Has High Inlet Pressure

Usage:

C7.1 770

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

Note: Refer to Troubleshooting, "Service Tool Features" for information about service features.

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Table 1
Diagnostic Trouble Codes
J1939 Code	CDL Code	Code Description (code descriptions may vary)	Comments
3609-15	E1156 (1)	High DPF #1 Intake Pressure	The code is logged.

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Table 2
Associated Diagnostic Trouble Codes
J1939 Code	CDL Code
3719-16	E995 (2)
3719-0	E995 (3)
3720-15	E997 (1)
3720-16	E997 (2)

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Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Associated Diagnostic Trouble Codes A. Establish communication between the electronic service tool and the engine Electronic Control Module (ECM). B. Determine if any of the codes in Table 2 are present.	Associated Diagnostic Codes	Result: An associated diagnostic trouble code is not present. Proceed to Test Step 2. Result: An associated diagnostic trouble code is present. Repair: Refer to Troubleshooting, "Event Codes" to troubleshoot the associated diagnostic code. If the problem is not resolved, proceed to Test Step 2.
2. Ash Service Maintenance A. Determine the most recent cleaning of the Diesel Particulate Filter (DPF).	Cleaning Interval	Result: The diesel particulate filter was cleaned within the last 5000 hours. Proceed to Test Step 3. Result: The diesel particulate filter was not cleaned within the last 5000 hours. Proceed to Test Step 4.
3. Check for Contamination A. Reset all active codes and clear all logged codes by using the electronic service tool. B. Remove the DPF. C. Check for contamination on the face of the DPF and the Diesel Oxidation Catalyst (DOC).	Contamination	Result: There is oil, fuel, or coolant on the DPF and/or the DOC. Repair: Perform the following procedure: 1. Clean the DPF. 2. Cleaning the DPF is not an ash service cleaning. Do not reset the engine ash model. The ash cannot be removed from the DPF if soot is present. 3. Reconnect the DOC and the DPF. 4. Start the engine. Run the engine at 1400 RPM with no load. Run the engine for at least 15 minutes or run the engine until there is no more white smoke. If the 3609-15 (E1156 (1)) diagnostic code remains active, replace the DPF. Return the unit to service.
4. Perform an Ash Service A. Reset all active codes and clear all logged codes by using the electronic service tool. B. Clean the DPF. Refer to Systems Operation and Testing and Adjusting, "Diesel Particulate Filter - Clean" for the correct procedure. C. Perform an "ARD Ignition Test" in the electronic service tool. Check for the 3609-15 (E1156 (1)) diagnostic code. The ARD Ignition Test cannot be performed if the DPF soot loading is above 80%. When the DPF soot loading is above 80%, the Manual DPF Regeneration must be performed using the electronic service tool.	Active Codes	Result: There are no active diagnostic codes. Return the unit to service. Result: The 3609-15 (E1156 (1)) diagnostic code is active. Repair: Replace the DPF. Reset all active codes and clear all logged codes by cycling the keyswitch to the Off position. Perform an "ARD Ignition Test" to verify that the problem is resolved. Return the unit to service.