C13 Industrial Engine Caterpillar

NRS Exhaust Gas Temperature Is High

Usage:

C13 JR9

This procedure covers the following diagnostic trouble codes:

Note: The following codes may not be applicable for certain applications.

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

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Table 1
Diagnostic Trouble Codes
J1939 Code	Code Description (code descriptions may vary)	Comments
412-15	Engine Exhaust Gas Recirculation Temperature : High - least severe (1)	The temperature of the NRS exhaust gas has exceeded the threshold for a set amount of time.
412-16	Engine Exhaust Gas Recirculation Temperature : High - moderate severity (2)	The temperature of the NRS exhaust gas has exceeded the threshold for a set amount of time.

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Illustration 1	g02895019
Typical left side engine view (1) NRS inlet valve (2) NRS temperature sensor (3) NRS outlet valve

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Table 2
Associated Diagnostic Trouble Codes
110-15
110-16
110-0

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Table 3
Troubleshooting Test Steps	Values	Results
1. Check for Associated Diagnostic Trouble Codes A. Establish communication between Caterpillar Electronic Technician (ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary. B. Download the "Warranty Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes. C. Determine if an associated code is active or logged. Table 2 lists associated diagnostic codes.	Associated diagnostic code	Result: There are associated codes. Refer to Troubleshooting, "Diagnostic Trouble Codes" in order to troubleshoot the associated diagnostic code. Result: A 412 code and a 2659 code are present. Proceed to Test Step 3. Result: There are no associated codes. Proceed to Test Step 2.

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Illustration 2	g02895021
NRS cooler (4) Exhaust outlet (5) Vent port (6) Exhaust inlet (7) Coolant inlet (8) Coolant outlet

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Table 4
Troubleshooting Test Steps	Values	Results
2. Perform a "EGR System Test" A. Reset all active codes and clear all logged codes. Use Cat ET to perform an "EGR System Test" in order to verify that the problem is resolved.	Test completed successfully	Result: The "EGR System Test" did not complete due to a 412-16 code. Repair the vent line or replace the vent line from the cooler to the shunt tank. Remove the exhaust lines from the inlet and the outlet of the cooler. Inspect the internal passage of the cooler for coolant. If coolant is found, replace the cooler. Reset all active codes and clear all logged codes. Use Cat ET to perform an "EGR System Test" in order to verify that the problem is resolved. Return the unit to service. Result: The "EGR System Test" completed successfully. Proceed to Test Step 3.

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Illustration 3	g02895036
Typical right side engine view (9) NRS cooler

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Table 5
Troubleshooting Test Steps	Values	Results
3. Inspect the NRS Cooler A. Remove the NRS cooler. Refer to Disassembly and Assembly for more information. B. Perform a leak test on the cooler. Refer to System Operation Testing and Adjusting, "Exhaust Cooler (NRS) - Test" for the proper procedure.	Leakage	Result: The cooler has internal leakage. Replace the cooler. Replace the connection for the bellows at the inlet of the cooler. Reset all active codes and clear all logged codes. Use Cat ET to perform an "EGR System Test" in order to verify that the problem is resolved. Return the unit to service. Result: The cooler did not have internal leakage. Clean the cooler. Refer to Testing and Adjusting, "Exhaust Cooler (NRS) - Clean" for the proper procedure to clean the cooler for the NRS.