854028 Mercruiser NUT-LOCK

Low Engine Oil Pressure
The ECM monitors the engine oil pressure by measuring an electrical signal from the oil pressure sensor. The oil pressure sensor is located on the filter outlet elbow. The filter outlet elbow is located on the front left corner of the engine. The ECM compares the actual engine oil pressure to an oil pressure map. The map is stored in the ECM memory. The map represents the minimum acceptable oil pressure. The map is based upon engine speed. If the oil pressure drops below the minimum acceptable level, the ECM will activate the low oil pressure warning. This warning will be displayed on the monitoring panel. Also, an event will be logged in the ECM memory. Factory passwords are required to clear logged events.High Engine Coolant Temperature
The ECM monitors the engine coolant temperature by measuring an electrical signal from the engine coolant temperature sensor. The coolant temperature sensor is located in the housing for the coolant temperature regulators. The ECM compares actual coolant temperature to the maximum allowable limit. If the temperature of the engine coolant exceeds the trip point, the ECM will send the high coolant temperature warning to the monitoring panel. The warning will remain activated until the coolant temperature drops below the hysteresis. The event is logged in the permanent ECM memory. Factory passwords are required to clear this information.Engine Overspeed
The ECM determines the engine speed by measuring an electrical signal from the speed/timing sensor. The sensor is located on the flywheel housing. The sensor is next to the left camshaft drive gear. If engine speed exceeds the trip point, an operator warning is given. The warning will remain active until the engine speed drops below the hysteresis. The peak engine overspeed is logged in the permanent ECM memory. The peak engine overspeed is logged as a histogram in order to quantify the magnitude of the engine overspeed. The histogram provides information in order to assess the potential level of engine damage. Factory passwords are required to clear this information.Air Inlet Restriction
The ECM determines the atmospheric pressure by measuring an electrical signal from the atmospheric pressure sensor. The sensor is located on the mounting bracket for the ECM at the front right corner of the engine. Turbocharger inlet pressure is determined by measuring an electrical signal from the turbocharger inlet pressure sensors. The sensors are located in the air induction tubes. The air induction tubes are between the air filters and the turbochargers.The ECM calculates the pressure drop across the air filters by subtracting the air pressure in the air inlet system from the atmospheric pressure. If the air filter restriction exceeds the trip point, the air filter restriction warning is displayed on the monitoring panel. The event will also be logged in the permanent ECM memory. Factory passwords are required to clear this information.Engine Fuel Filter Restriction
The engine ECM utilizes a fuel filter differential pressure switch. The switch is mounted in the fuel filter housing. The switch is used to provide a signal to the ECM. The ECM sends a signal to the monitoring panel via the data link. The monitoring panel will warn the operator when the restriction of the fuel filter reaches an unacceptable level. An event will also be logged in the ECM. The event can be viewed with the electronic service tool. The event can also be cleared with the electronic service tool.Engine Oil Filter Restriction
The ECM determines the restriction of the oil filter by calculating the difference between the filtered oil pressure and the unfiltered oil pressure.Exhaust Temperatures
The engine ECM uses the exhaust temperature sensors for the turbocharger to provide a signal via the data link to the machine monitoring panel. The signal will indicate if the exhaust temperature to the turbocharger is at an acceptable level. The monitoring panel warns the operator if the exhaust temperature exceeds the trip point. A higher temperature will cause the ECM to derate the engine. The event will also be logged in the ECM. The event can be viewed with the electronic service tool. A factory password is required in order to clear this event with the electronic service tool. If the temperature is reduced below the hysteresis, the derate is deactivated.Coolant Flow
The coolant flow switch is at the outlet of the jacket water pump. The switch provides a signal via the data link to the monitoring panel. The signal indicates if the coolant flow for the jacket water coolant is at an acceptable level. The monitoring panel will warn the operator of unacceptable coolant flow. An event will also be logged in the ECM. The event can be viewed with the electronic service tool. A factory password is required to clear the event with the electronic service tool.Low Coolant Pressure (FDB01262-Up)
Earlier machines used the coolant flow switch for monitoring. Later machines use a coolant pressure sensor that is located in the piping after the outlet for the jacket water pump. The monitoring system compares the signal from the pressure sensor to a map of coolant pressure and engine speed. If the coolant pressure is not sufficient for the engine rpm, a warning is generated.High Aftercooler Temperature
The ECM monitors the temperature of the engine aftercooler by measuring an electrical signal from the aftercooler coolant temperature sensor. The temperature sensor is located in the aftercooler outlet pipe. The ECM compares actual coolant temperature to the maximum allowable limit. The event is logged in the permanent ECM memory. Factory passwords are required to clear this information.High Crankcase Pressure
The ECM gets data from the crankcase pressure sensor that is mounted on the camshaft cover. The ECM provides a signal via the data link to the machine monitoring panel. The monitoring panel will warn the operator if the crankcase pressure exceeds the trip point. An event will also be logged in the ECM. The event can be viewed with the electronic service tool. The event can also be cleared with the electronic service tool.Very Low Engine Oil Level
The oil level switch in the