814077 Mercury VALVE, Shut-Off

Electronic Controls
Electronic Control Module
The ECM supplies signals to the electronic unit injectors. The ECM signals control the engine operation. The ECM consists of two main components, the control computer (hardware) and the Personality Module (software). The control computer consists of a microprocessor and of electronic circuitry. The Personality Module is the software for the control computer which contains operating maps that define power and torque curves.The ECM governs engine speed. Desired engine rpm is determined by the throttle position sensor signal and certain sensor readings. Diagnostic codes may derate the engine. Actual engine rpm is determined by the Engine Speed/Timing signal.Fuel Injection
The ECM controls the timing of the injectors. The ECM varies the signals to the injectors. Fuel is injected ONLY while an injector solenoid is energized by a 105 volt signal from the ECM. By controlling the timing and duration of the 105 volt signal, the ECM controls the fuel injection timing, the quantity of fuel and the desired engine rpm.Injection timing depends on engine rpm, load, and other operational factors. The ECM detects the top center of each cylinder. The ECM sends an injection signal at the desired time. The ECM limits engine power during cold mode operation. The ECM modifies the injection timing and the ECM cuts out the cylinders. This will increase startability and this will reduce warm up time. Cold Mode is activated whenever the engine coolant temperature falls below a predetermined value. Cold Mode remains active until the engine has warmed or a time limit is exceeded.The Fuel Air Ratio Control (FARC) monitors the absolute air pressure at the air inlet and engine speed. The FARC limits the amount of fuel to the engine. The fuel limit is based on a map of the manifold absolute pressure and engine speed. Manifold absolute pressure is determined by measuring turbocharger outlet pressure. A minimum fuel limit is programmed at the factory. The minimum fuel limit allows the engine to carry a parasitic load at low idle. The FARC uses two different maps. A map is used when the engine is operating at normal engine temperature. A different map is used in cold mode operation.The Rated Fuel Position is a limit that is based on the engine power rating. This is similar to the rack stops and the torque spring on a mechanically governed engine. The Rated Fuel Position provides power. The Rated Fuel Position provides the power curves and the torque curves for a specific engine family.Engine Wiring Diagram for the 3500B Engine with EMCP II+ and with Loadshare Unit
Illustration 1 g00835095
Location of the Engine Components for the 3512B and 3516B Engines
Illustration 2 g00760962
Typical left side view (1) Unfiltered fuel pressure sensor (2) Filtered fuel pressure sensor (3) Filtered oil pressure sensor (4) Left exhaust temperature sensor (5) Left air shutoff solenoid (6) Left turbocharger compressor inlet pressure sensor (7) Coolant temperature sensor (8) Engine speed/timing sensor (9) Aftercooler temperature sensor (10) Ether starting aid (11) Power distribution box (12) Starting motorsLocation of the Engine Components for the 3512B and 3516B Engines
Illustration 3 g00760873
Typical right side view (13) Right turbocharger compressor inlet pressure sensor (14) Right air shutoff solenoid (15) Right exhaust temperature sensor (16) Crankcase pressure sensor (17) Alternator (18) Air start solenoid (19) Prelube pump (20) Prelube pump junction boxLocation of the Engine Components for the 3512B and 3516B Engines
Illustration 4 g00792263
Typical front and rear view (21) Right turbocharger compressor inlet pressure sensor (alternate mounting with air shutoff) (22) Left turbocharger compressor inlet pressure sensor (alternate mounting with air shutoff) (23) Turbocharger compressor outlet pressure sensor (24) Atmospheric pressure sensor (25) Unfiltered oil pressure sensor (26) Electronic control module (ECM) (8) Engine speed/timing sensorLocation of the Engine Components for the 3508B Engines
Illustration 5 g00792267
Typical left side view (1) Unfiltered fuel pressure sensor (2) Filtered fuel pressure sensor (3) Unfiltered oil pressure sensor (4) Filtered oil pressure sensor (5) Left air shutoff solenoid (6) Left turbocharger compressor inlet pressure sensor (7) Coolant temperature sensor (8) Atmospheric pressure sensor (9) Aftercooler temperature sensor (10) Engine speed/timing sensor (11) Ether starting aid (12) Power distribution box (13) Starting motorsLocation of the Engine Components for the 3508B Engines
Illustration 6 g00792265
Typical right side view (14) Right turbocharger compressor inlet pressure sensor (15) Right air shutoff solenoid (16) Air start solenoid (17) Alternator (18) Crankcase pressure sensorLocation of the Engine Components for the 3508B Engines
Illustration 7 g00792268
Typical front and rear vie