859602 Mercury DIPSTICK

Interface Harnesses
Illustration 1 g03314136
Components of the power distribution circuits (right side engine view)
(1) Control box connector for the interface harness to the low current power distribution panel
(2) Right rail connector
(3) Interface harness
(4) Harness for the right rail
(5) Conduit
(6) Power distribution panel The interface harnesses are used to route the power from the power distribution panels to the control box and other engine electrical or electronic components.Controllers
Illustration 2 g03317883
Diagram of the Engine Management System (EMS)
(7) Engine ECM
(8) Local CAN data link
(9) Global CAN data link
(10) Caterpillar Electronic Technician (ET)
(11) Controller for the fuel control valve
(12) Temperature control module (TCM)
(13) Engine interface connector (70-pin connector)
(14) EMCP This engine is designed for electronic control of most engine operating functions. The Engine Management System (EMS) provides this control. The EMS is made up of a network of electronic controllers that communicate through the data links. Information related to engine operation is shared between the controllers. The EMS also provides information to external devices such as the operator display panel. The electronic system consists of the control modules that make up the EMS, the wiring harness, switches, sensors, and fuel injectors. The control modules receive information from the sensors and the switches on the engine. The information is shared over the data link. This information is then processed in order to provide engine control. Refer to Troubleshooting, "Data Link Features" for an overview of the data links for this engine.Electronic Control Module (ECM)
Illustration 3 g01496913
Engine ECM
The engine ECM consists of two main components, the control computer (hardware) and the flash file (software). The control computer consists of a microprocessor and electronic circuitry. The flash file contains the engine operational characteristics. The operating maps that influence the engine performance are also contained in the flash file.The engine ECM provides engine control by altering the signal that is sent to the fuel injector solenoids. By controlling the signal timing and duration, the engine ECM controls the engine speed and the engine power.The engine ECM provides control for various subsystem components. The following subsystem components are controlled by the engine ECM:
Engine prelube system
System for engine cranking
Fuel system
Various other componentsThe engine ECM also collects data in order to provide information on various aspects of engine operation.Controller for the Fuel Control Valve
Illustration 4 g03317888
Location of the fuel system components
(16) Controller for the fuel control valve
(16) Fuel control valve The controller for the fuel control valve receives throttle commands from the engine ECM. The controller translates the command to a valve position for the fuel control valve. The ECM provides a PWM output in order to drive the throttle signal for the controller. The desired throttle position is also communicated over the local CAN data link in order to provide a backup signal for the throttle control.The ECM provides a filtered supply voltage to the controller for the fuel control valve in order to power the unit. The supply voltage is filtered in order to protect the unit from voltage surge.A keyswitch input is provided in order to bring the controller out of sleep mode.Temperature Control Module (TCM)
Illustration 5 g03317892
Components of the electronic fluid temperature control
(17) TCM
(18) Variable position electric motor
(19) Three-way valve The engine electronic fluid temperature control consists of a three-way valve that directs coolant flow through the engine. The valve assembly incorporates a TCM, a coolant temperature sensor, and a piston that rides on a lead screw. The lead screw is turned by a variable position electric motor. The electric motor is controlled by the TCM.The TCM receives the signal from the coolant temperature sensor. As the coolant temperature of the engine varies, the sensor signal also varies. The controller detects the change in coolant temperature and the electric motor is energized. The electric motor turns the lead screw to a predetermined position. the lead screw actuates the piston and the piston is repositioned in the bore of the valve body.When the cooling system temperature control module is powered, the controller drives the piston to the position of zero percent bypass. This action provides a reset for the electric motor and for the position of the piston. When the piston hits the stop, a clicking sound can be heard from the unit. This reset function will be performed by the controller in approximately 80 seconds. The reset establishes the position of the piston prior to the controlled movement of the piston.The desired temperature for the TCM is communicated from the engine ECM via the local CAN data link during normal operation. A default setting for the desired temperature is also stored in the control module internal memory. If the communication to the control module is lost, the TCM will use the default value as the desired temperature. The coolant temperature will be controlled without interruption of the operation of the engine. The default setting for the desired temperature for this application is 85 °C (185 °F).Wiring Harnesses
Harness for the Left Rail
Illustration 6 g03314156
Connectors that are on the harness for the left rail
(20) Connector for the turbocharger compressor inlet pressure sensor (No. 2 (right side))
(21) Connector for the turbocharger compressor inlet pressure sensor (No. 1 (lef