3100 HEUI Diesel Truck Engine Electronic Control System Components

Electronic Control System Components (left side view)
(1) Injection actuation pressure control valve. (2) Injection actuation pressure sensor. (3) Timing calibration connector J24/P24. (4) Wiring harness. (5) High pressure oil pump. (6) ECM. (7) Top engine speed/timing sensor. (8) Bottom engine speed/timing sensor. (9) J1/P1 Connector (OEM). (10) J2/P2 Connector (engine).


Electronic Control System Components (top view)
(1) Injection Actuation Pressure Control Valve. (2) Injection actuation pressure sensor. (3) Timing calibration connector J24/P24. (4) Wiring harness. (5) High pressure oil pump. (6) ECM. (11) Coolant Temperature Sensor. (12) Coolant temperature sensor connector J10/P10. (13) Air inlet heater lamp connector J40. (14) Air inlet heater relay connector J37/P37. (15) Air inlet heater relay. (16) Intake manifold air temperature sensor. (17) Boost pressure sensor. (18) Intake manifold air temperature sensor connector J21/P21. (19) Fuel transfer pump.
Electronic Control System Components (front view)
(2) Injection actuation pressure sensor. (16) Intake manifold air temperature sensor. (17) Boost pressure sensor.

The electronic control system is integrally designed into the engines fuel, air inlet, and exhaust systems to electronically control fuel delivery and injection timing. It provides increased control of timing and fuel/air ratio control in comparison to conventional mechanical engines. Injection timing is achieved by precise control of unit injector firing time, and engine rpm is controlled by adjusting the injection duration. The ECM energizes the fuel injection pump solenoids to start injection of fuel, and de-energizes the fuel injection pump solenoids to complete or stop injection of fuel. See the topic, Hydraulic Electronic Unit Injector, for a complete explanation of the fuel injection process.

The engine uses three types of electronic components which are: input, control and output.

An input component is one that sends an electrical signal to the electronic control module of the system. The signal sent varies in either voltage, frequency, or pulse width in response to change in some specific system of the vehicle (examples are: speed/timing sensor, coolant temperature sensor, cruise control switches, etc.). The electronic control module sees the input sensor signal as information about the condition, environment, or operation of the vehicle.

A system control component receives the input signals. Electronic circuits inside the control evaluate the signals and supply electrical energy to the output components of the system in response to predetermined combinations of input signal values.

An output component is one that is operated by a control module. It receives electrical energy from the control group and uses that energy to either:

1) Perform work (such as a moving solenoid plunger will do) and thereby take an active part in regulating or operating the vehicle.
2) Give information or warning (such as a light or an alarm will do) to the operator of the vehicle or other person.
These components provide the ability to electronically control the engine operation to improve performance, minimize fuel consumption, and reduce emissions levels.

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