77253 Mercruiser DECAL, WAVES

Illustration 1 g06005213
Typical example
(1) Air cleaner
(2) Diesel Oxidation Catalyst (DOC)
(3) DOC inlet temperature sensor
(4) DOC exhaust temperature sensor
(5) Turbocharger
(6) Intake throttle valve for the NOx Reduction System (NRS)
(7) Valve for the NOx Reduction System (NRS)
(8) Exhaust gas cooler (NRS)
(9) Boost pressure sensor
(10) Coolant temperature sensor
(11) Primary speed/timing sensor
(12) Secondary speed/timing sensor
(13) Electronic Control Module (ECM)
(14) Engine
(15) Inlet manifold temperature sensor
(16) Oil pressure switch
(17) Engine glow plugs
(18) Fuel temperature sensor
(19) Secondary fuel filter
(20) Fuel transfer pump
(21) Primary fuel filter
(22) Fuel tankSensor Locations for the Engine
The illustrations in this section show the typical locations of the sensors for the industrial engine. Specific engines may appear different from the illustration due to differences in applications.Note: In the following illustrations, some components have been removed to improve visibility.
Illustration 2 g03798752
Typical sensor locations on the left side of the engine
(1) Secondary speed/timing sensor
(2) Coolant temperature sensor
(3) Electronic unit injector
(4) Exhaust gas valve for the NOx Reduction System (NRS)
(5) Intake throttle valve for the NOx Reduction System (NRS)
Illustration 3 g03798805
Close-up views of typical sensor locations on the left side of the engine
(1) Secondary speed/timing sensor
(2) Coolant temperature sensor
(3) Electronic unit injector
(4) Exhaust gas valve for the NOx Reduction System (NRS)
(5) Intake throttle valve for the NOx Reduction System (NRS)
Illustration 4 g06004533
Typical sensor locations on the right side and top of the engine
(6) Boost pressure sensor
(7) Air inlet temperature sensor
(8) Intake throttle valve for the NOx Reduction System (NRS)
(9) Exhaust gas valve for the NOx Reduction System (NRS)
(10) Oil pressure switch
(11) Fuel pressure sensor
(12) Fuel temperature sensor
(13) Suction control valve for the fuel injection pump
(14) Primary speed/timing sensor
Illustration 5 g03799436
Close-up views of typical sensor locations on the right side and top of the engine
(6) Boost pressure sensor
(7) Air inlet temperature sensor
(8) Intake throttle valve for the NOx Reduction System (NRS)
(9) Exhaust gas valve for the NOx Reduction System (NRS)
(10) Oil pressure switch
(11) Fuel pressure sensor
(12) Fuel temperature sensor
(13) Suction control valve for the fuel injection pump
(14) Primary speed/timing sensorSensor Locations for the Clean Emissions Module
Illustration 6 g03797799
Sensors and components on a typical Clean Emissions Module (CEM)
(1) DOC exhaust temperature sensor
(2) DOC inlet temperature sensorECM
Illustration 7 g03797803
Typical example
The Electronic Control Module (ECM) (1) functions as a computer for the fuel system.The electronic system consists of the ECM, the engine sensors, and inputs from the application. The ECM is the computer. The flash file is the software for the computer. The flash file contains the operating maps. The operating maps define the following characteristics of the engine:
Engine rating
Torque curves
High and low idle speed (rpm)
EmissionsThe ECM has an excellent record of reliability. Any problems in the system are most likely to be the connectors and the wiring harness. The ECM should be the last item in troubleshooting the engine.The programmable software contains all the fuel setting information. The information determines the engine performance.Flash programming is the method of programming or updating the programmable software. Refer to Troubleshooting, "Flash Programming" for the instructions on the flash programming of the programmable software.The ECM is sealed and the ECM needs no routine adjustment or maintenance.Engine Speed
The ECM has software that compares the desired engine speed to the actual engine speed. The actual engine speed is determined through the crankshaft speed sensor. If the desired engine speed is greater than the actual engine speed, the ECM will instruct the fuel injection pump to supply more fuel to the fuel injectors to increase engine speed.Fuel Injection
The programmable software inside the ECM sets certain limits on the amount of fuel that can be provided to the fuel injectors.The ECM controls the following characteristics:
Fuel pressure
Start of injection
Injection durationDiagnostic Codes
When the ECM detects an electronic system problem, the ECM generates a diagnostic code. Diagnostic codes are provided to indicate that the ECM has detected an electrical problem or an electronic problem with the engine control system. Some