HOSE ASSEM. 164cm(64.57 in.) 7P8704 - Caterpillar

Table 1
Diagnostic Codes for NRS Exhaust Gas Temperature Is High
J1939 Code Code Description
(code descriptions may vary) Comments
412-15 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 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. Probable Causes
Diagnostic codes
Coolant leak or low coolant level
NRS coolerRecommended Actions
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 2
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 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
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).
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).