ELBOW 2M9786 - Caterpillar

The information from the sensors enables the Electronic Control Module (ECM) to control the engine as efficiently as possible over a wide range of operating conditions.The sensors also enable the module to activate alarms, impending shutdowns, and shutdowns in response to abnormal operation. The functions of the sensors are described below.
Illustration 1 g02006095
Right side view
Typical locations for the 12 cylinder engine and the 20 cylinder engine.
(1) Differential pressure sensor for the throttle valve
(2) Pressure sensor for turbocharger compressor outlet
(3) Temperature sensor for turbocharger compressor outlet
(4) Pressure sensor for the coolant outlet
(5) Emergency stop button
(6) Inlet manifold air pressure sensor
(7) Oil temperature sensor
(8) Pressure switch for the coolant pump (inlet)
(9) Timing calibration connector
(10) Pressure sensor for unfiltered oil
(11) Pressure sensor for filtered oil
Illustration 2 g02006115
Left side view
Typical locations for the 12 cylinder engine and the 20 cylinder engine.
(12) Coolant temperature sensor
(13) Inlet manifold air temperature sensor
(14) Engine speed/timing sensor
(15) Detonation sensor Throttle differential pressure sensor (1) - This sensor monitors the pressure drop across the throttle valve.Compressor outlet pressure sensor (2) - This sensor monitors the pressure of the air/fuel mixture from the turbocharger compressor outlet.Compressor outlet temperature sensor (3) - This sensor monitors the temperature of the air/fuel mixture from the turbocharger compressor outlet.Coolant pressure sensor (outlet) (4) - A pressure switch is located at the outlet for the engine jacket water. If the outlet pressure is too low, the ECM will activate a shutdown.Emergency stop button (5) - Pressing this button causes a shutdown.Inlet manifold air pressure sensor (6) - This sensor is connected to the inlet manifold. The sensor monitors the absolute manifold pressure. Absolute pressure is the atmospheric pressure plus the gauge pressure. The information is used by the ECM to calculate the air flow. To observe the output value of the sensor, use Cat ET to view the "Inlet Manifold Air Pressure (abs)".Oil temperature sensor (7) - An oil temperature sensor measures the engine oil temperature. A high oil temperature will activate an alarm or a shutdown. The trip points