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Table 1
Diagnostic Codes for NRS Exhaust Gas Temperature Is High    
J1939 Code    Code Description    Comments    
412-15     Engine Exhaust Gas Recirculation Temperature : High - least severe     The exhaust gas temperature in the NRS has reached 178° C (352° F) for 8 seconds.
The ECM has been powered for at least 2 seconds.
The engine has been running for at least 180 seconds.
There are no electrical faults on the circuit.    
412-16     Engine Exhaust Gas Recirculation Temperature : High - moderate severity     The exhaust gas temperature in the NRS has reached
180° C (356° F) for 8 seconds.
The engine will be derated.
The ECM has been powered for at least 2 seconds.
The engine has been running for at least 180 seconds.
There are no electrical faults on the circuit.    
Illustration 1 g02315455
Components of the NRS cooler (1) Coolant inlet pipe (2) NRS Exhaust inlet pipe (3) NRS cooler (4) NRS Exhaust outlet pipe (5) Coolant outlet pipeTest Step 1. Check for Associated Diagnostic Trouble Codes
Establish communication between the electronic service tool and the ECM . If necessary, refer to Troubleshooting, "Electronic Service Tools".
Determine if an associated code is active or logged. Table 2 lists associated diagnostic codes.
Table 2
Associated Codes    
J1939 Code     Description    
110-15     Engine Coolant Temperature : High - least severe    
110-16     Engine Coolant Temperature : High - moderate severity    
110-0     Engine Coolant Temperature : High - most severe    Results:
There are associated codes. - Repair: Refer to Troubleshooting, "Diagnostic Trouble Codes" in order to troubleshoot the associated diagnostic code.STOP
A 412 code and a 2659-18 code are present. - Proceed to Test Step 3.
There are no associated codes. - Proceed to Test Step 2.Test Step 2. Perform an Air Systems Service TestRefer to Illustration 1.
Establish communication between the electronic service tool and the ECM .
Select "Diagnostics" from the toolbar at top of screen.
Select "Diagnostic Tests" from the drop-down menu.
Select "Air Systems Motor Valve Verification Test".Results:
The air systems service test did not complete due to a 412-16 code. - Repair: Perform the following procedure:
Remove the exhaust inlet (2) and the exhaust outlet (4) from the NRS cooler (3) .Note: During the following inspection, some condensation may be present in the NRS cooler. This condition is normal.
Inspect the internal passage of the NRS cooler for evidence of coolant.
If significant amount of coolant is found, replace the NRS cooler. Refer to Disassembly and Assembly, "Exhaust Cooler (NRS) - Remove and Install".STOP
The air systems test completed successfully. - Proceed to Test Step 3.Test Step 3. Inspect the NRS CoolerRefer to Illustration 1.Perform a leak test on the NRS cooler. Refer to Systems Operation, Testing, and Adjusting, "Exhaust Cooler (NRS) - Test".Results:
The NRS cooler has internal leakage. - Repair: Perform the following procedure:
Replace the NRS cooler. Refer to Disassembly and Assembly, "Exhaust Cooler (NRS) - Remove and Install".
Use the electronic service tool to clear all related diagnostic trouble codes.
Run the engine and ensure that the fault has been eliminated.
If the fault is still present, contact the Technical Communicator at a Caterpillar dealer.STOP
The NRS cooler did not have internal leakage. - Repair: Perform the following procedure:
Use the electronic service tool to clear all related diagnostic trouble codes.
Run the engine until the normal operating temperature is reached and ensure that the fault has been eliminated.
If the fault is still present, contact the Technical Communicator at a Caterpillar dealer.STOP