5441100LP Mercruiser STERNDRIVE UNIT (Complete)

Table 1
Event Code
Description Conditions which Activate the Code System Response
E368(1) High Inlet Air Temperature The inlet air temperature has exceeded the trip point for the programmed delay time. The code is logged.
The alarm output is activated.
E368(2) High Inlet Air Temperature The code is logged.
The alarm output is activated.
The Electronic Control Module (ECM) initiates a request for a reduction of engine power to the operator panel.
E368(3) High Inlet Air Temperature The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down. Probable Causes
High ambient air temperature
High coolant temperature
High inlet air restriction and/or high altitude
Faulty inlet air temperature sensor and/or circuit
Insufficient flow of cooling water through the aftercooler
Insufficient flow of air through the aftercoolerRecommended Actions
High Ambient Air Temperature
Determine if the ambient air temperature is within the design specifications for the cooling system.Determine the cause of the high air temperature. Modify the inlet air system in order to supply intake air that is within specifications, if necessary.High Coolant Temperature
Check for a high coolant temperature for the engine.Refer to Troubleshooting, "Coolant Temperature Is High".High Inlet Air Restriction and/or High Altitude
When inlet air pressure is low, the turbocharger works harder in order to achieve the desired inlet air pressure. This increases inlet air temperature.Measure the inlet air pressure while the engine is operating under load. For specific data, refer to the performance data sheet for your engine.Inlet Air Restriction
Check for plugged air filters. Check for obstructions to the air inlet. Replace the air filters and/or remove the obstruction from the air inlet.High Altitude
Confirm that the settings for the engine are correct for operation at the altitude of the engine installation.Faulty Inlet Manifold Air Temperature Sensor and/or the Circuit
Allow the engine to cool. Remove the sensor from the engine. Use Cat ET to check the status of the "Inlet Air Temperature" parameter. Compare the reading to the ambient air temperature. If the sensor is OK, the readings will be approximately equal.If the readings are not approximately equal, switch the suspect sensor with a sensor that is known to be good. Replace the suspect sensor, if necessary.Insufficient Flow of Cooling Water Through the Aftercooler
Note: For two-stage aftercoolers, be sure to check both sections.Check the inlet temperature of the coolant for the aftercooler. Compare the reading to the regulated temperature. If the temperature is OK, check the outlet temperature of the coolant for the aftercooler. A high temperature differential indicates an insufficient flow rate.If there is a high differential between the inlet temperature and the outlet temperature of the coolant for the aftercooler, perform the following procedure:
Check the water circuit of the aftercooler for obstructions.
Check the pump for proper operation.The maximum pressure differential across the aftercooler core is 23 kPa (3.35 psi).Perform the necessary repairs.Insufficient Flow of Air Through the Aftercooler
Note: For two-stage aftercoolers, be sure to check both sections.Determine the pressure differential of the inlet air across the aftercooler. For specific data, refer to the Systems Operation/Testing and Adjusting for details.If the pressure differential of the air across the aftercooler does not match the specifications, clean the aftercooler.