0318529 JOHNSON SHOULDER SCREW

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Left side view (1) Primary speed/timing sensor (2) Fuel temperature sensor (3) Inlet air temperature sensor (If Equipped) (4) Inlet manifold pressure sensor (5) Customer connector (6) Marine transmission temperature sensor (7) Marine transmission oil pressure sensor (8) Coolant level sensor (9) Fuel pressure sensor (10) Atmospheric pressure sensor (If Equipped)
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Right side view (11) Coolant temperature sensor (12) Secondary speed/timing sensor (13) Engine oil pressure sensorYour engine may be equipped with various optional engine features and controls that are not pictured here. This section discusses the general information about various features and the engine control systems.Coolant Temperature Sensor
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Coolant temperature sensorThis sensor monitors engine coolant temperature. The coolant temperature signal is sent to the Electronic Control Module (ECM) for engine monitoring and for improved engine control. The output of the ECM can indicate a high coolant temperature through a relay or a lamp. In addition, the sensor activates the cold start strategy which improves the startability of the engine.The minimum coolant temperature that will activate the alarm is 106°C (223°F). The switch opens as the coolant cools. A resetting procedure is not required.Failure of the Coolant Temperature Sensor
If one of the following conditions exist, a failure of the coolant temperature sensor may have occurred:
Sensor output is open.
Sensor output is shorted to ground or supply.
Measured reading of the coolant temperature is out of the specification.The ECM will detect the failure of the coolant temperature sensor. The diagnostic lamp will warn the operator about the status of the coolant temperature sensor. Strategies that are related to the coolant temperature will be disabled. A failure of the coolant temperature sensor will not cause a shutdown of the engine or any horsepower change.Coolant Level Sensor
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Coolant level sensorThe coolant level sensor monitors the engine coolant level. The coolant level sensor is used to detect a condition when the coolant level is low. The coolant level sensor provides information to the Electronic Control Module (ECM). The output from the ECM can indicate a low coolant level through a relay or a lamp. Coolant must be added to the cooling system in order to correct the condition. See this Operation and Maintenance Manual, "Refill Capacities" and this Operation and Maintenance Manual, "Fluid Recommendations" for more information.Failure of the Coolant Level Sensor
When the output of the coolant level sensor is open, shorted to ground or shorted to supply, a failure of the coolant level sensor may have occurred.A failure of the coolant level sensor will not cause a shutdown of the engine or any horsepower change.Engine Oil Pressure Sensor
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Engine oil pressure sensorThe engine oil pressure sensor can detect engine oil pressure for diagnostic purposes. The engine oil pressure sensor sends a signal to the Electronic Control Module (ECM).Low Oil Pressure Warning
The setpoint is dependent upon the engine rpm. The fault will be active and logged only if the engine has been running for more than 15 seconds. Very Low Oil Pressure Warning
The very low oil pressure setpoint is dependent upon the engine rpm. If the DERATE mode of the engine monitoring system is selected, the ECM will derate the engine power. The engine horsepower will be limited.Failure of the Engine Oil Pressure Sensor
If one of the following conditions exist, a failure of the engine oil pressure sensor may have occurred:
Sensor output is open.
Sensor output is shorted to ground or supply.
Measured reading of the engine oil pressure is out of the specification.The ECM will detect the failure of the engine oil pressure sensor. The diagnostic lamp warns the user about the status of the engine oil pressure sensor. Strategies that are related to engine oil pressure will be disabled.A failure of the engine oil pressure sensor will not cause a shutdown of the engine or any horsepower change.Marine Transmission Oil Pressure Sensor
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Marine transmission oil pressure sensorMonitoring the marine transmission oil pressure is a programmable option. The ECM monitors marine transmission oil pressure with a sensor that is located on the high-pressure side of the transmission. High marine transmission oil pressure is detected for diagnostics.The output from the ECM monitors the marine transmission oil pressure. The maximum allowable marine transmission oil pressure is 700 to 2963 kPa (102 to 430 psi). The output of the ECM can indicate high oil pressure through a relay or a lamp.Marine Transmission Oil Temperature Sensor
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Marine transmission oil temperature sensorThe marine transmission oil temperature sensor measures the temperature of the oil in the marin