C7.1 Engines and Generator Sets Caterpillar

Use this procedure to troubleshoot a failed aftertreatment regeneration or use this procedure if one of the following event codes are active. Refer to Troubleshooting, "Event Codes" for information about event codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".

Active regenerations usually occur during normal engine operation. However, engine operation or operator desire may cause the operator to activate the force regeneration switch. This switch signals the Engine Electronic Control Module (ECM) that a forced regeneration is desired. The engine ECM will determine the status of the engine and the products operating condition and determine if active regeneration can begin. The elapsed time is approximately 5 seconds for the engine ECM to determine if the conditions are acceptable for active regeneration to begin.

If conditions allow that active regeneration may begin, the ECM will illuminate the appropriate indicators and begin the active regeneration. If conditions will not allow active regeneration to begin, the ECM will illuminate the Action Lamp and annunciate one of the following Diagnostic Trouble Codes (DTCs). The code will appear on the Messenger Display. The code will also be displayed on the electronic service tool.

Note: One forced regeneration per key cycle is permitted if a failure to ignite, insufficient temperature to complete regeneration, or loss of combustion diagnostic trouble code is active. This regeneration determines if the regeneration can run and clear the event.

Table 1

Diagnostic Trouble Codes
J1939 Code	CDL Code	Code Description (code descriptions may vary)	Comments
3483-11	E1305 (1)	Initial Assembly Aftertreatment #1 Procedure Required	Initial assembly of the aftertreatment system is complete or the Engine ECM or the A5:E2 Aftertreatment Controller was replaced.
3530-31	E1040 (2)	ARD Manually Disabled	The regeneration system is disabled by the electronic service tool.
3716-15	E1300 (1)	Aftertreatment Regeneration Cannot Start Due to Low Engine Temperature	The coolant temperature is below 40° C (104° F) and the Diesel Particulate Filter inlet temperature is below 50° C (122° F). If the ambient temperature is 0° C (32° F) or below, the coolant temperature must be 60° C (140° F) for active regeneration to begin.
3703-31	E993 (3)	DPF Active Regeneration Inhibited Due to Inhibit Switch	The regeneration system is disabled due to the ARD Disable Switch in the operator interface.
3712-15	E1301 (1)	Aftertreatment Regeneration Cannot Start Due To System Fault	There is an active fault related to the ARD combustion air system, ARD fuel system, or ARD ignition system.
3716-31	E1300 (2)	Aftertreatment Regeneration Cannot Start Due To Low Engine Temperature	The coolant temperature is below 40° C (104° F) and the Diesel Particulate Filter inlet temperature is below 50° C (122° F). If the ambient temperature is 0° C (32° F) or below, the coolant temperature must be 60° C (140° F) for active regeneration to begin.
3750-15	E1302 (1)	Aftertreatment Regeneration Cannot Start Due To Conditions Not Met	One or more conditions are not allowing an Aftertreatment Regeneration to start, Refer to Test Step 7.
3750-31	E1239 (1)	DPF #1 Conditions Not Met for Active Regeneration	The operator did not allow enough time for regeneration to occur. The operator must respond when the DPF lamp is illuminated. The operator must allow the engine to idle until the regeneration is complete.

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

Table 2

Troubleshooting Test Steps	Values	Results
1. Check for Diagnostic Codes that are Active A. Establish communication between the electronic service tool and the Electronic Control Module (ECM). Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Check and record any event codes that are active or logged.	Diagnostic Code	Result: A 3750-31 (E1239 (3)) diagnostic code is present. Proceed to Test Step 2. Result: A 3703-31 (E993 (3)) diagnostic code is present. Proceed to Test Step 3. Result: A 3530-31 (E1040 (2)) diagnostic code is present. Proceed to Test Step 4. Result: A 3716-15 (E1300 (1)) or 3716-31 (E1300 (2)) diagnostic code is present. Proceed to Test Step 5. Result: A 3712-15 (E1301 (1)) diagnostic code is present. Proceed to Test Step 6. Result: A 3750-15 (E1302 (1)) or diagnostic code is present. Proceed to Test Step 7. Result: A 3483-11 (E1305 (1)) diagnostic code is present. Proceed to Test Step 8.
2. A 3750-31(E1239 (1)) A. The operator did not allow regeneration to occur or automatic regeneration did not occur within the required time limit. The operator must respond when the DPF lamp is illuminated. B. Perform a "Forced Regeneration" by pressing the "Regeneration Force Switch" button.	Forced Regeneration	Result: The "Forced Regeneration" was successful. Return the unit to service. Result: The "Forced Regeneration" was not successful. Repair: Troubleshoot the active diagnostic codes.
3. A 3703-31E993 (3) Diagnostic Code is Present A. The operator has disabled the regeneration system and regeneration is necessary.	Disabled Regeneration	Result: Perform a manual DPF regeneration. Refer to the Operation and Maintenance Manual, "Diesel Particulate Filter Regeneration" for the proper operation of the regeneration system. Return the unit to service.
4. A 3530-31 (E1040 (2)) Diagnostic Code is Present A. The regeneration system is disabled by the electronic service tool.	Regeneration Disabled by the electronic service tool.	Result: Establish communication between the electronic service tool and the engine ECM. Set the value of the "Aftertreatment Regeneration Device" from "Disabled" to "Enabled". Return the unit to service.
5. A 3716-15 (E1300 (1)) or 3716-31 (E1300 (2)) diagnostic code is present A. The engine temperature is too low for an aftertreatment regeneration.	Low Engine Temperature	Result: Raise the coolant temperature above 40° C (104° F) and the Diesel Particulate Filter inlet temperature above 50° C (122° F). If the ambient temperature is −15° C (5° F) or below, the coolant temperature must be above 60° C (140° F) for active regeneration to begin. Return the unit to service.
6. A 3712-15 (E1301 (1)) diagnostic code is present. Note: Aftertreatment regeneration cannot start due to a system fault. A. Establish communication between the electronic service tool and the engine Electronic Control Module (ECM). B. Check for active faults related to the ARD combustion air system, ARD fuel system, or ARD ignition system.	System Fault	Result: Troubleshoot all active faults related to the ARD combustion air system, ARD fuel system, or ARD ignition system. Clear any active codes after correcting the faults. Activate regeneration. Return the unit to service.
7. A 3750-15 (E1302 (1)) or diagnostic code is present Note: Aftertreatment regeneration cannot start due to conditions not being met. A. Check for the following conditions: 1. Soot load is too high (116% plus 10 minutes after getting a level 3 high soot warning) 2. The "Time to Regenerate" is greater than 8 hours 3. Incorrect work mode conditions (parking brake is not set, transmission is not in neutral) 4. Engine speed and load conditions inhibit the forced regeneration request 5. Excessive DPF intake temperature. This condition can be caused by high engine speed and/or high load 6. Regenerations are not disabled 7. For Industrial applications, Refer to the OEM wiring schematic to ensure that the CEM is wired correctly for automatic regenerations if applicable 8. An active derate, pressure based or temperature-based event codes 9. An ARD Nozzle Heater cycle was active when the Force Regeneration switch was pressed.	Unacceptable Conditions	Result: Correct any of the listed conditions. Activate regeneration. If an excessive DPF intake temperature is present, reduce engine speed and/or load and perform a low speed regeneration Return the unit to service.
8. A 3483-11 (E1305 (1)) diagnostic code is present Note: An initial assembly aftertreatment #1 regeneration is required. A. Establish communication between the electronic service tool and the engine Electronic Control Module (ECM). B. Under the "Information" menu, select "Current Totals". Record the "Total Operating Hours".	Total Operating Hours	Result: The "Total Operating Hours" is less than 100 hours. Repair: Complete an "Aftertreatment System Functional Test" using the electronic service tool to clear the E1305 or 3483-11 code. Result: The "Total Operating Hours" is greater than 100 hours. Repair: Complete an "Ash Service Regeneration" using the electronic service tool to clear the E1305 or 3483-11 code.