GEAR 2W7339 - Caterpillar

The engine has an Electronic Control Module (ECM). There are also various engine sensors. The ECM controls the engine operating parameters through the software within the ECM and the inputs from the various sensors. The software contains parameters that control the engine operation. The parameters include all the operating maps and customer-selected parameters.The electronic control system has the following components:
ECM
Pressure sensors
Temperature sensors
Speed/timing sensors
Intake throttle valve for the NOx Reduction System (NRS)Illustration 1 is a block diagram of the control system
Illustration 1 g06102915
Typical example
(1) Air cleaner
(2) Diesel Oxidation Catalyst (DOC)
(3) DOC inlet temperature sensor (if equipped)
(4) DOC exhaust temperature sensor (if equipped)
(5) Turbocharger
(6) Intake throttle valve for the NOx Reduction System (NRS) (if equipped)
(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.Four Cylinder Engines
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 g06090664
Typical sensor locations on the right side and top of the engine
(6) Boost pressure sensor
(7) Air inlet temperature sensor
(8) Oil pressure switch
(9) Fuel pressure sensor
(10) Fuel temperature sensor
(11) Suction control valve for the fuel injection pump
(12) Primary speed/timing sensor
Illustration 5 g06090668
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) Oil pressure switch
(9) Fuel pressure sensor
(10) Fuel temperature sensor
(11) Suction control valve for the fuel injection pump
(12) Primary speed/timing sensorThree Cylinder Engines
Illustration 6 g06090608
Typical sensor locations on the left side of the engine
(1) Secondary speed/timing sensor
(2) Coolant temperature sensor
(3) Exhaust gas valve for the NOx Reduction System (NRS)
(4) Electronic unit injector
Illustration 7 g06090638
Typical sensor locations on the right side and top of the engine
(5) Air inlet temperature sensor
(6) Boost pressure sensor
(7) Oil pressure switch
(8) Fuel pressure sensor
(9) Fuel temperature sensor
(10) Suction control valve for the fuel injection pump
(11) Primary speed/timing sensorSensor Locations for the Clean Emissions Module
Illustration 8 g03797799
Sensors and components on a typical Clean Emissions Module (CEM)
(1) DOC exhaust temperature sensor (if equipped)
(2) DOC inlet temperature sensor (if equipped)ECM
Illustration 9 g03797803
Typical example
The Electronic Control