0581288 JOHNSON LEAD ASSY.,Neutral start

Illustration 1 g00592255
(1) Secondary Speed/Timing Sensor
(2) Primary Speed/Timing Sensor
(3) Turbocharger Outlet Pressure Sensor
(4) Fuel Temperature Sensor
(5) Inlet Air Temperature Sensor
(6) Timing Calibration Connector
(7) Atmospheric Pressure Sensor
(8) Engine Oil Pressure Sensor
(9) Coolant Temperature Sensor Coolant Temperature Sensor
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Location of the Engine Coolant Temperature Sensor
The engine coolant temperature sensor monitors the temperature of the engine coolant. The coolant temperature signal is sent to the Electronic Control Module (ECM) for engine monitoring and for improved engine control. The signal is used by the ECM for all of the following engine functions:
Engine timing control
Engine operating mode
Engine protectionThe ECM is capable of adjusting the engine timing relative to the engine operating temperature. The concept of dynamic timing provides the engine with the ability to control exhaust emissions. Timing control also aids in white smoke cleanup during cold engine operation.The ECM also uses the signal from the engine coolant temperature sensor to determine the mode of operation for the engine. Several aspects of engine operation are affected by the engine operating mode: acceleration ramp rates, engine timing and fuel injector timingCoolant Temperature Protection
Excessive engine coolant temperature is an undesirable operating condition. Serious damage to the engine can result if an engine is allowed to overheat. If the engine coolant temperature increases to excessive levels, the engine monitoring system will initiate actions that will protect the engine from damage.This generator set application may be equipped with an Electronic Modular Control Panel II (EMCP II) that is used to provide engine control. If this control panel is installed, the engine ECM communicates the engine coolant temperature to the control panel. The EMCP II performs the engine monitoring and protection functions for the engine.The following engine protection is available for engine coolant temperature: - If the engine monitoring control is programmed to "", the EMCP II will display a warning that will inform the operator of the engine overheating problem.SHUTDOWN - If the overheating condition is allowed to continue, the EMCP II will shut down the engine. This function also has the ability to utilize a time delay.For more detailed information about the operation of the control panel, refer to Operation and Maintenance Manual, SEBU7050, "SR4B Generators and Control Panels".Coolant Level Sensor
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Location of the Coolant Level Sensor
The coolant level sensor is an optional sensor. This sensor monitors the engine coolant level in the cooling system expansion tank. The coolant level sensor signal is sent to the Electronic Modular Control Panel II+ (EMCP II+) for the purpose of engine monitoring. The EMCP II+ can respond to a low coolant level status in either of the following manners:
Fault alarm indicator
Automatic engine shutdownCoolant must be added to the cooling system in order to correct the condition.For more detailed information about the operation of the engine coolant level sensor, refer to Operation and Maintenance Manual, SEBU7050, "SR4B Generators and Control Panels".Engine Oil Pressure Sensor
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Location of the Engine Oil Pressure Sensor
The engine oil pressure sensor provides an oil pressure signal to the Electronic Control Module (ECM) for the purpose of engine monitoring. The electronic signal is compared to an Oil Pressure Map that is stored in ECM memory. The Oil Pressure Map is derived from a direct relationship between engine speed and the oil pressure that is expected at that speed. The engine monitoring system records a low engine oil pressure condition in ECM memory if the sensor value is not within the proper range. The monitoring system then initiates protective measures.Low Oil Pressure Protection
When a low oil pressure condition exists in the engine, there is a possibility of damage to major engine components. Low oil pressure protection is a safety feature that will take the necessary measures in order to initiate an engine shutdown in the event of a low oil pressure condition.This generator set application may be equipped with an Electronic Modular Control Panel II (EMCP II) that is used to provide engine control. If this control panel is installed, the engine ECM communicates the engine oil pressure to the control panel. The EMCP II performs the engine monitoring and protection functions for the engine.The following engine protection is available for low oil pressure protection: - If the engine monitoring control is programmed to "", the EMCP II will display a warning to the operator during a low oil pressure condition.SHUTDOWN - If the engine monitoring control is programmed to "SHUTDOWN", the EMCP II will shut down the engine during a low oil pressure condition.For more detailed information about the operation of the control panel, refer to Operation and Maintenance Manual, SEBU7050, "SR4B Generators and Control Panels".Fuel Temperature Sensor
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Location of the Fuel Temperature Sensor
The fuel temperature sensor monitors the inlet fuel temperature. The Electronic Control Module (ECM) utilizes the signal from the fuel temperature sensor to provide fuel temperature compensation for the engine fuel control system. Fuel temperature compensation provides the following benefits:
Rated engine horsepower regardless of fuel temperature
Highly accurate fuel rates and fuel consumption rates
Optimum fuel economyChanges in the temperature of the fuel affects the power output of the engine. The ECM adjusts the engine fuel rate according to the temperature of the fuel. This feature allows full engine power to be realized by the operator at any fuel temperature.Fuel temperature will also affect the calculation of fuel consumption rate that is performed by the ECM. The ECM utilizes the fuel temperature signal to provide an adjusted value for these calculations.Fuel Pressure Sensor
The fuel pressure sensor monitors filtered fuel pressure. Although fuel pressures that are outside the normal operating range may adversely affect engine performance, there should not be any noticeable reduction in the engine horsepower. Abnormal fuel pressure will not cause an engine shutdown. A low filtered f