SPN 105 - FMI 15 (Event Codes: High Intake Manifold Temperature)

SPN 105 FMI 15
SPN105 FMI15

Figure 1.1 - SPN 105 FMI 15 (Murphy PowerView)

Use this procedure in order to troubleshoot High Inlet Air Temperature. Use this procedure if one of the following Event Codes is active.
  • E539(1) High Intake Manifold Air Temperature 
  • E539(2) High Intake Manifold Air Temperature
  • E368(1) High Inlet Air Temperature 
  • E368(2) High Inlet Air Temperature
Figure 1.2 - Logged Event Codes

#Conditions which Generate this Code
→The Intake Manifold Air Temperature is above the trip point for the delay time.
→The Inlet Air Temperature is above the trip point for the delay time.

#System Response:
→The code is logged.
→Derate is a 3 percent for every degree over the trip point. The maximum derate is 20 percent.

#Probable Causes:
  • High Coolant Temperature
  • High Ambient Air Temperature
  • Air Inlet Restriction
  • Exhaust Restriction
  • Altitude
  • Engine Overload

#Recommended Actions:
1). High Coolant Temperature
A High Coolant Temperature will increase the Intake Manifold Air Temperature. Verify that the cooling system is filled to the proper level. 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.

Check the operation of the cooling fan. A fan that is not turning at the correct speed can cause improper air speed across the aftercooler core. The lack of proper air flow across the aftercooler core can cause the intake air not to cool to the proper temperature.
Figure 1.3 - Event Codes active (Status Flags)

Check for air in the cooling system. Air can enter the cooling system in different ways. The most common causes of air in the cooling system are the incorrect filling of the cooling system. Also, combustion gas leakage into the cooling system. Combustion gas can get into the system through inside cracks, a damaged cylinder head, or a damaged cylinder head gasket.

2). High Ambient Air Temperature
Determine if the Ambient Air Temperature is within the design specifications for the cooling system. When ambient temperatures are too high for the rating of the cooling system, there is not enough of a temperature difference between the ambient air and coolant temperatures. Determine any causes for high temperature in the Engine compartment.

3). Air Inlet Restriction
Check for a restriction in the air inlet system. A restriction of the air that is coming into the Engine can cause high cylinder temperatures. High cylinder temperatures cause higher than normal temperatures in the cooling system. The coolant temperature must be within the correct range in order to cool the intake air.

4). Exhaust Restriction
Check for a restriction in the exhaust system. A restriction of the air that is coming out of the Engine can cause high cylinder temperatures.

5). Altitude
Consider high altitude operation. The cooling capability of the cooling system is reduced at higher altitudes. A pressurized cooling system that is large enough to keep the coolant from boiling must be used. Make sure that the settings for the Engine are correct for the altitude. Read More: Absolute Pressure and Gauge Pressure on Caterpillar ET Software.

6). Engine Overload
The Engine may be running in the lug condition. When the load that is applied to the Engine is too large, the Engine will run in the lug condition. When the Engine is running in the lug condition, Engine rpm does not increase with an increase of fuel. This lower Engine rpm causes a reduction in coolant flow through the system.

#Trip points for the Monitoring System
The Monitoring System determines the level of action that is taken by Electronic Control Module (ECM) in response to a condition that can damage the Engine. When any of these conditions occur, the appropriate Event Code will trip.
Figure 1.4 - High Engine Inlet Air Temperature


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