SPROCKET 8W8334 - Caterpillar

Illustration 1 g02148253
Left side view of the engine
(1) Electronic Control Module (ECM)
(2) NOx Reduction System (NRS) temperature sensor
(3) Differential pressure sensor for the NRS system
(4) Absolute pressure sensor for the NRS system
(5) Engine oil pressure sensor
(6) Crankshaft speed/timing sensor
(7) Buffer for the exhaust temperature sensors
(8) Turbocharger inlet temperature sensor for cylinders 1,3, and 5
(9) Turbocharger inlet temperature sensor for cylinder 7,9, and 11
Illustration 2 g02148254
Right side engine view
(10) Solenoid for NRS actuator
(11) Camshaft speed/timing sensor
(12) Turbocharger inlet temperature sensor for cylinders 8, 10, and 12
(13) Turbocharger inlet temperature sensor for cylinders 2,4, and 6
(14) Buffer for the exhaust temperature sensors
Illustration 3 g02148274
(15) Harness connector for the injectors for the cylinders on the left bank of the engine
(16) Harness connector for the injectors for the cylinders on the right bank of the engine
(17) Control valve
(18) Right intake manifold temperature sensor
(19) Left intake manifold temperature sensor
(20) Crankcase pressure sensor
(21) Intake manifold pressure sensor
(22) J2/P2 ECM connectors
(23) J1/P1 ECM connectors
(24) Atmospheric pressure sensor
(25) Coolant temperature sensor
(26) Fuel temperature sensor
(27) Fuel filter differential pressure switch (If equipped)
(28) Fuel pressure sensor (If equipped) The electronic control system is integrally designed into the fuel system and the engine air inlet and exhaust system in order to control the fuel delivery electronically. The electronic control system provides better timing control and fuel air ratio control in comparison to conventional mechanical engines. Injection timing is achieved by the precise control of the fuel injectors. Engine speed is controlled by adjusting the injection duration. The Electronic Control Module (ECM) energizes the unit injector solenoids in order to start the injection of fuel. Also, the ECM de-energizes the unit injector solenoids in order to stop the injection of fuel. Refer to Systems Operation/Testing And Adjusting, "Fuel System" for a complete explanation of the fuel injection process.The engine uses the following three types of electronic components:
Input component
Control component
Output componentAn input component is one that sends an electrical signal to the ECM. The signal that is sent varies in either of the following ways:
Voltage
Frequency
Pulse widthThe variation of the signal is in response to a change in some specific system of the engine. Some specific examples of an input component are the engine speed-timing sensors, and the coolant temperature sensor. The ECM interprets the signal from the input component as information about the condition, environment, or operation of the engine.An ECM receives the input signals from the input components. Electronic circuits inside the control component evaluate the signals from the input components. These electronic circuits also supply electrical energy to the output components of the system. The electrical energy that is supplied to the output components is based on predetermined combinations of input signal values.An output component is one that is operated by a control module. The output component receives electrical energy from the control group. The output component uses electrical energy to make an adjustment in one of the systems of the engine. An output component may also provide information to the operator.As an example, a moving solenoid plunger will perform work. By