NRS Exhaust Gas Temperature Is High
System Operation Description:
This procedure covers the following diagnostic trouble codes:
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| 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. |
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| 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 pipe | |
Test 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.
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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 Test
Refer 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) .
- Inspect the internal passage of the NRS cooler for evidence of coolant.
Note: During the following inspection, some condensation may be present in the NRS cooler. This condition is normal.
- 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 Cooler
Refer 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
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