Electronic Controls
Electronic Control Module
The ECM consists of two main components, the control computer (hardware) and the Personality Module (software). The control computer consists of a microprocessor and 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 ECM is programmed at the factory which limits the quantity of fuel that can be injected. The FRC Fuel Position controls the fuel limit for exhaust smoke. The FRC is based on the maximum allowable fuel to air ratio.
The FRC Fuel Position is increased when the ECM senses a higher Turbocharger Compressor Outlet Pressure. This will allow more fuel into the cylinder. 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
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| Illustration 1 | g00606460 |
Location of the Engine Sensors
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| Illustration 2 | g00844954 |
Left side view 3508B (1) Unfiltered fuel pressure sensor (2) Filtered fuel pressure sensor (3) Filtered oil pressure sensor (4) Coolant temperature sensor (5) Left air shutoff valve (6) Left exhaust temperature sensor (7) Atmospheric pressure sensor (8) Aftercooler temperature sensor (9) Primary engine speed/timing sensor (10) Secondary engine speed/timing sensor | |
Location of the Engine Sensors
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| Illustration 3 | g00844955 |
Right side view 3508B (11) Right exhaust temperature sensor (12) Crankcase pressure sensor (13) Right air shutoff valve (14) Timing calibration sensor | |
Location of the Engine Sensors
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| Illustration 4 | g00606465 |
Front view 3508B (16) Turbocharger compressor outlet pressure sensor (17) Atmospheric pressure sensor (18) Electronic control module (19) ECM connector "J1/P1" (20) ECM connector "J2/P2" | |
Location of the Engine Sensors
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| Illustration 5 | g00853407 |
Rear view 3508B (9) Primary engine speed/timing sensor (10) Secondary engine speed/timing sensor (21) Left turbocharger compressor inlet pressure sensor (22) Right turbocharger compressor inlet pressure sensor | |
Location of the Engine Sensors
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| Illustration 6 | g00853416 |
Left side view 3512B (1) Electronic unit injector (2) Left air shutoff solenoid (3) Left exhaust temperature sensor (4) Primary engine speed/timing sensor (5) Secondary engine speed/timing sensor | |
Location of the Engine Sensors
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| Illustration 7 | g00853421 |
Left side inset view 3512B (6) Unfiltered fuel pressure sensor (7) Filtered fuel pressure sensor (8) Filtered engine oil pressure sensor (9) Unfiltered engine oil pressure sensor (10) Coolant temperature sensor (11) Atmospheric pressure sensor (12) Aftercooler temperature sensor | |
Location of the Engine Sensors
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| Illustration 8 | g00853426 |
Right side view 3512B (13) Right exhaust temperature sensor (14) Right air shutoff solenoid (15) Timing calibration sensor (16) Crankcase pressure sensor | |
Location of the Engine Sensors
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| Illustration 9 | g00844956 |
Rear view and Front view 3512B (9) Unfiltered engine oil pressure sensor (11) Atmospheric pressure sensor (16) Left turbocharger compressor inlet pressure sensor (17) Right turbocharger compressor inlet pressure sensor (18) Turbocharger compressor outlet pressure sensor (19) ECM connector "J1/P1" (20) ECM connector "J2/P2" (21) Electronic control module(ECM) (22) Magnetic pickup | |
Location of the Engine Sensors
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| Illustration 10 | g00853263 |
Left side view 3516B (1) Left air shutoff solenoid (2) Left exhaust temperature sensor (3) Primary engine speed/timing sensor (4) Secondary engine speed/timing sensor | |
Location of the Engine Sensors
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| Illustration 11 | g00853279 |
Left side inset view 3516B (5) Unfiltered fuel pressure sensor (6) Filtered fuel pressure sensor (7) Filtered engine oil pressure sensor (8) Coolant temperature sensor (9) Atmospheric pressure sensor (10) Aftercooler temperature sensor | |
Location of the Engine Sensors
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| Illustration 12 | g00853262 |
Right side view 3516B (11) Right exhaust temperature sensor (12) Right air shutoff solenoid (13) Crankcase pressure sensor (14) Timing calibration sensor | |
Location of the Engine Sensors
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| Illustration 13 | g00853264 |
Front view and Rear view 3516B (3) Primary engine speed/timing sensor (4) Secondary engine speed/timing sensor (9) Atmospheric pressure sensor (15) Unfiltered engine oil pressure sensor (16) Turbocharger compressor outlet pressure sensor (17) Left turbocharger compressor inlet pressure sensor (18) Right turbocharger compressor inlet pressure sensor (19) ECM connector "J1/P1" (20) ECM connector "J2/P2" (21) Electronic control module(ECM) (22) Magnetic pickup | |
Electronic Governor
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| Illustration 14 | g00607278 |
Electronic Governor | |