KIT-SEAL-H. 2281795 - Caterpillar

The Electronic Control Module (ECM) monitors the intake manifold air for excessive temperature. The following event codes are associated with high intake manifold air temperature:
Table 1
Diagnostic Trouble Codes for High Intake Manifold Air Temperature
J1939 Code Code Description Comments
172-16 Engine Air Inlet Temperature : High - moderate severity (2) The engine has been running for 3 minutes.
No other 172 codes are active.
168 codes are not active.
The intake manifold air temperature exceeds the value that is programmed into the ECM for 8 seconds. The code is logged.
This code will be reset when the temperature is less than 122° C (252° F) for 4 seconds. Probable Causes
Coolant level
Air-to-air aftercooler (ATAAC) (if equipped)
Cooling fan
Air inlet and exhaust system
Ambient temperature
Altitude
Running condition
Intake air from a heated areaRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 2
Troubleshooting Test Steps Values Results
1. Coolant Level
A. Check that the coolant is filled to the correct level.
Note: If the coolant level is too low, air will get into the cooling system. Air in the cooling system will cause a reduction in coolant flow.
Coolant
Result: The coolant level is low.
Repair: Fill the coolant system to the correct level. Refer to the Operation and Maintenance Manual, "Coolant Level - Check".
Result: The coolant level is OK.
For engines with an aftercooler, proceed to Test Step 2.
For engines with no aftercooler, proceed to Test Step 3.
2. Air-to-Air Aftercooler (ATAAC) (If Equipped)
A. Check the ATAAC for debris or damage.
Note: Debris between the fins of the ATAAC core restricts air flow through the core.
ATAAC
Result: The ATAAC has excessive debris or is damaged.
Repair: Clear the debris from the ATAAC or replace the ATAAC.
Result: The ATAAC is OK.
Proceed to Test Step 3.
3. Cooling Fan
A. Check the operation of the cooling fan.
Note: A fan that is not turning at the correct speed can result in insufficient airflow through the aftercooler core.
Cooling fan
Result: The cooling fan is not operating correctly.
Repair: Investigate the cause of the incorrect fan operation
Result: The cooling fan is operating correctly.
Proceed to Test Step 4.
4. Air Intake and Exhaust System
A. Check the air intake and exhaust system for the following defects:
Blockages
Restrictions
Damage to the air intake ducts and hoses
Loose connections and air leaks
Air intake and exhaust
Result: The air intake or exhaust system is blocked, restricted, damaged, or loose.
Repair: Make all necessary repairs to the air intake system.
Result: The air intake and exhaust system is OK.
Proceed to Test Step 5.
5. Ambient Temperature
A. Check for a high ambient temperature.
Note: When outside temperatures are too high, there is insufficient temperature difference between the outside air and the intake air.
Ambient Temperature
Result: The ambient air temperature is high.
Repair: Operate the engine at reduced speed or reduced power.
Result: The ambient air temperature is OK.
Proceed to Test Step 6.
6. Altitude
A. Check for operation at high altitude.
Note: The cooling capacity of the ATAAC is reduced as the engine is operated at higher altitudes.
Altitude
Result: The engine is being operated at high altitude.
Repair: Operate the engine at reduced speed or reduced power.
Result: The engine is not being operated at high altitude.
Proceed to