C7.1 Engines Caterpillar


NRS Exhaust Gas Temperature Is High

Usage:

C7.1 881


This procedure covers the following diagnostic trouble codes:

Table 1
Diagnostic Codes for NRS Exhaust Gas Temperature Is High 
J1939 Code  CDL Code  Code Description
(code descriptions may vary) 
Comments 
412-15  E1092 (1)  Engine Exhaust Gas Recirculation Temperature : High - least severe (1)  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 (2)  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 1g03776141
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 pipe

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

Probable Causes

  • Diagnostic codes

  • Coolant leak or low coolant level

  • NRS cooler

Recommended Actions


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.

Table 3
Troubleshooting Test Steps  Values  Results 

1. Diagnostic Codes

A. Download the Warranty Report and the Product Status Report with Histograms before performing any 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 or E1092 code and a 110-X or E361 code are present.

Repair: Rectify the 110-X or E361 code. Refer to Troubleshooting, "Coolant Temperature Is High".

Result: A 412-X or E1092 code is present.

Proceed to Test Step 2.
 

2. Coolant Check

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

Refer to Illustration 1.

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.

If the fault is still present, contact the Dealer Solutions Network (DSN).
 

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