3512E Tier 4 Final Engines for Land Electric Drilling Caterpillar

NRS Exhaust Gas Temperature Is High

Usage:

Use this procedure to troubleshoot a high NOx Reduction System (NRS) exhaust gas temperature. Also, use this procedure if one of the following event codes is active or logged.

Show/hide table

Table 1
J1939 Code and Description	CDL Code and Description	Comments
412-15 Engine Exhaust Gas Recirculation Temperature : High - least severe (1)	E1092 (1) High EGR Temperature	The temperature of the NOx Reduction System (NRS) exhaust gas has exceeded the threshold for a set amount of time.
412-16 Engine Exhaust Gas Recirculation Temperature : High - moderate severity (2)	E1092 (2) High EGR Temperature	The temperature of the NRS exhaust gas has exceeded the threshold for a set amount of time.

Show/hide table

Table 2
Associated Codes
J1939 Code	CDL Code	Troubleshooting Procedure
110-0	E361 (3)	Troubleshooting, "Coolant Temperature Is High"
110-15	E361 (1)	Troubleshooting, "Coolant Temperature Is High"
110-16	E361 (2)	Troubleshooting, "Coolant Temperature Is High"

Probable Causes

Codes
NRS coolers

Recommended Actions

Show/hide table

Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Codes A. Connect Cat^® Electronic Technician (ET) to the service tool connector. B. Look for active codes that are associated with the system for the event code.	Codes	Result: An associated code is active. Repair: Troubleshoot any associated codes before continuing with this test. Result: A code is active or logged. Proceed to Test Step 2.
2. Perform a "EGR System Test" A. Connect Cat ET. B. Use Cat ET to perform the following diagnostic test: - "EGR System Test"	Test	Result: The "EGR System Test" did not complete due to a E1092 or 412 code. Repair: Perform the following procedure: 1. Repair or replace the vent line from the coolers to the engine block. Remove the exhaust lines from the inlet and the outlet of the coolers. Inspect the internal passage of each cooler for coolant. If coolant is found, replace the coolers. 2. Connect Cat ET. 3. Use Cat ET to perform the following diagnostic test: - "EGR System Test" Verify that the repair eliminated the problem. Return to service. Result: The test failed and reported a Cat ET service error identifier. Repair: Refer to Troubleshooting, "NOx Reduction System (NRS) - Test" for additional information. Result: The test was successfully. Proceed to Test Step 3.
3. Check for leaks in the NOx Reduction System (NRS) Coolers A. Remove the NRS coolers. Refer to Disassembly and Assembly for additional information. B. Perform a leak test on each cooler. Refer to System Operation Testing and Adjusting, "Exhaust Cooler (NRS) - Test" for additional information.	Leaks	Result: The cooler has internal leakage. Repair: Perform the following procedure: 1. Replace the cooler. Replace the connection for the bellows at the inlet of the cooler. 2. Connect Cat ET. 3. Use Cat ET to perform the following diagnostic test: - "EGR System Test" Verify that the repair eliminated the problem. Return to service. Result: The cooler did not have internal leakage. Repair: Clean the cooler. Refer to Testing and Adjusting, "Exhaust Cooler (NRS) - Clean" for additional information. Return 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).