C4.4 and C6.6 Engines Caterpillar

NRS Exhaust Gas Temperature Is High

Usage:

C4.4 448

This procedure covers the following diagnostic trouble codes:

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Table 1
Diagnostic Codes for NRS Exhaust Gas Temperature Is High
J1939 Code	CDL Code	Description (code descriptions may vary)	Notes
412-15	E1092 (1)	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	E1092 (2)	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.

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Illustration 1	g06101341
Components of the NRS cooler on a C4.4 engine (1) NRS Exhaust outlet pipe (2) Coolant inlet pipe (3) NRS cooler (4) Coolant outlet pipe (5) NRS Exhaust inlet pipe

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Illustration 2	g06101408
Components of the NRS cooler on a C6.6 engine (1) NRS Exhaust inlet pipe (2) Coolant inlet pipe (3) NRS cooler (4) Coolant outlet pipe (5) NRS Exhaust outlet pipe

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Table 2
Associated Codes
J1939 Code	CDL Code	Description (code descriptions may vary)
110-15	E361 (1)	Engine Coolant Temperature : High - least severe
110-16	E361 (2)	Engine Coolant Temperature : High - moderate severity
110-0	E361 (3)	Engine Coolant Temperature : High - most severe

Probable Causes

Diagnostic codes
Cooling system
NRS cooler

Recommended Actions

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NOTICE

Do not crank the engine continuously for more than 30 seconds. Allow the starting motor to cool for two minutes before cranking the engine again.

Note: The procedures have been listed in order of probability. Complete the procedures in order.

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Table 3
Troubleshooting Test Steps	Values	Results
1. Diagnostic Codes A. Download the Warranty Report and the Product Status Report with Histograms before troubleshooting or clearing any diagnostic codes. Note: The downloaded information will be required by the Dealer Solutions Network (DSN) if troubleshooting assistance is needed. B. Use the electronic service tool to check for active or logged codes.	Diagnostic codes	Result: A 412-X code and a 110-X code are present. Repair: Rectify the 110-X code. Refer to Troubleshooting, "Coolant Temperature Is High". Result: A 412-X code is present. Proceed to Test Step 2.
2. Cooling System A. Check for leaks from the coolant system. B. Check that the coolant level is correct. Refer to the Operation and Maintenance Manual, Coolant Level - Check.	Coolant	Result: Coolant leaks were identified. Repair: Repair any coolant leaks. Repeat the procedure from Step 1. Result: Coolant level is low. Repair: Ensure that the coolant level is corrected. Repeat the procedure from Step 1. Result: The coolant level is OK and there are no leaks. Proceed to Test Step 3.
3. Inspect the NRS Cooler for Leaks For C4.4 engines, refer to Illustration 1. For C6.6 engines, refer to Illustration 2. A. Perform a leak test on the NRS cooler. Refer to Systems Operation, Testing, and Adjusting, "Exhaust Cooler (NRS) - Test".	NRS cooler	Result: The NRS cooler has internal leakage. Repair: 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 codes and then run the engine and ensure that the fault has been eliminated. Result: The NRS cooler has no internal leakage. The fault is still present. Contact the Dealer Solutions Network (DSN).