C2.4 Tier 4 Final Engines for Caterpillar Built Machines Caterpillar

Exhaust Temperature Is High

Usage:

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Table 1
Diagnostic Trouble Codes
Code	Description	Conditions Present	Response
3242-0	Aftertreatment 1 DPF Intake Gas Temperature: High – Most Severe (3)	Exhaust gas temp. sensor T0, T1, and T2 are normal Battery voltage is normal DPF inlet temp. (T1) : 715 °C (1319 °F) or more for 9 minutes or more	Engine stops Inhibit starter relay until exhaust temperature reduces down to 300 °C (572 °F) Warning Level 3
3246-0	Aftertreatment 1 DPF Outlet Gas Temperature: High – Most Severe (3)	Exhaust gas temp. sensor T0, T1, and T2 are normal Battery voltage is normal DPF outlet temp. (T2) : 820 °C (1508 °F) or more for 2 seconds or more	Engine stops Inhibit starter relay until exhaust temp. reduces down to 300 °C (572 °F) Warning Level 3
3252-0	Emissions Deterioration	Not in Regeneration mode. Coolant temp is 50° C (122° F) or more for more than 5 minutes after engine starts. T1-T0 ≥ 250 °C (482 °F) for 1 minute or more.	Engine derated 50% Engine acceleration limited 50% EGR Stops Intake Throttle Fully Open Warning Level 3
4765-0	DOC Inlet Temperature: High	Exhaust gas temp. sensor T0, T1, and T2 are normal Battery voltage is normal DOC inlet temp for turbo version (T0): 700 °C (1292 °F) or more DOC inlet temp for Naturally Aspirated (T0): 730 °C (1346 °F) or more) for 2 seconds or more	Engine stops Inhibit starter relay until exhaust temp. reduces down to 300 °C (572 °F) Warning Level 3
523601-0	High Exhaust Gas Temperature after Emergency High Temperature shutdown	Battery Voltage is normal.	Engine not allowed to starter (starter inhibited) until all aftertreatment temperatures are below 300 °C (572 °F).

Note: Codes are detecting a high exhaust gas temperature, when temperature sensors are normal.

Note: If any of the emergency shutdowns occur from high after treatment temperatures (3242-0, 3246-0, or 4765-0) and the engine is restarted prior to all of the aftertreatment temperatures being below 300 °C (572 °F), the 523601-0 code will occur.

If any of the following codes are active or logged, resolve those codes first:

4765-3 or 4765-4 Aftertreatment DOC Intake Gas Temperature: Voltage Above or Below Normal
3243-3 or 3424-4 Aftertreatment DPF Inlet Gas Temperature: Voltage Above or Below Normal
3246-3 or 3246-4 Aftertreatment DPF Outlet Gas Temperature: Voltage Above or Below Normal

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Table 2
Troubleshooting Test Steps	Values	Results
1. Check the Engine Oil Level and Obtain an Oil Sample Check oil level and obtain an oil sample. If the oil level is high, then take an oil sample to check for fuel dilution. Refer to Troubleshooting, Oil Contains Fuel if fuel is present.	Oil	Result: The engine oil sample shows moitor or action required, then skip to Step 5. Make the necessary repairs. Result: The engine oil sample and oil level are OK. Proceed to Test Step 4. Result: engine oil level is not at the correct level. Determine root cause of why the oil level was high or low.
2. Associated Codes Establish a connection with Caterpillar Electronic Technician (Cat ET).	Codes	Result: Associated codes are active. Refer to Troubleshooting, "Sensor Signal (Analog, Passive) - Test" Result: Associated codes are not active. Proceed to Test Step 3.
3. Turbocharger A. Check the turbocharger oil seal. If the turbocharger has failed, oil could get into the exhaust system. B. Check the Condition of the Turbocharger. Refer to Testing & Adjusting, "Turbocharger - Inspect".	Turbocharger	Result: The turbocharger is not operating properly and/or the condition is NOT OK. Replace the turbocharger. Result: The turbocharger is operating properly and the condition is OK. Proceed to Test Step 4.
4. Check for Proper Installation of all Exhaust Temperature Sensors	Exhaust Temperature Sensor	Result: The exhaust temperature sensors are installed properly. Proceed to Test Step 5. Result: The exhaust temperature sensors are not installed properly. Repair: Remove the exhaust temperature sensors and reinstall properly.
5. Check that the Exhaust Temperature Sensors are Operating Correctly	Exhaust Temperature Sensor	Result: The exhaust temperature sensors are operating correctly. Proceed to Test Step 6. Result: The exhaust temperature sensors are not operating correctly. Repair: Refer to “Sensor Signal (Analog, Passive) - Test”.
6. Check Exhaust Gas Temperature in Cat^® ET A. Check Exhaust Gas Temperature NOTE: Do not check temperatures until Cat^® ET shows that the temperatures are below 300° C (572° F). The temperature should be checked at the areas that are not insulated on the aftertreatment. B. Compare the actual exhaust temperature with a heat gun to the temperature that is listed in Cat^® ET.	Exhaust Gas Temperature	Result: The exhaust gas temperature is approximately the same. Proceed to Test Step 7. Result: If the temperatures are not approximately the same, then check the temperature sensor. Refer to Troubleshooting, "Sensor Signal (Analog, passive) - Test" for the correct resistance.
7. Check the condition of the Air Filter	Air Filter	Result: The air filter is clean and is in good condition. Proceed to Test Step 8. Result: The air filter is dirty and is in bad condition. Repair: Replace the air filter.
8. Air Intake System A. Check the air intake system. Refer to the Systems Operation/Testing and AdjustingKENR9884"Air Inlet and Exhaust System - Inspect"	Air Inlet	Result: The air intake system is not restricted. Proceed to Test Step 9. Result: The air intake system is restricted. Make the necessary repairs.
9. Check the Engine Oil Level	Oil Level	Result: The engine oil level is not at the correct level. Determine root cause of why the oil level was high or low. Fill or remove the engine oil to have the correct level. The engine oil level is correct. STOP

If the procedure did not correct the issue, Contact your Caterpillar dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

High Exhaust Gas Temperature After Emergency High Temperature Diagnostic Code

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Table 3
Diagnostic Trouble Code
Code	Description	Conditions Present	Response
523601-0	High Exhaust Gas Temperature After Emergency High Temperature DTC	Battery Voltage is normal.	Engine Stop Starter relay inhibited until all three exhaust gas temperatures decrease to 300C (572F). Warning Level 3

After a shutdown due to a high exhaust temperature, the engine ECM will not allow the engine to start until the exhaust temperatures have decreased to 300° C (572° F).

If you receive this diagnostic code, allow the Diesel Particulate Filter (DPF) to cool before starting the engine. Then troubleshoot the corresponding high exhaust temperature codes.