GUARD GP-RADIATOR 3842231 - Caterpillar

Monitoring Engine Operation
Sensors are used in order to monitor engine operation. Wiring harnesses connect the sensors to the ECM. The ECM uses information from the sensors in order to monitor the engine. The ECM also uses information from the sensors in order to control the engine. The information is also used to generate event codes, and diagnostic codes.Note: The codes can be read with Caterpillar Electronic Technician (ET). The codes can also be read on the Advisor monitor display, if equipped.Event - An event is a result of abnormal engine operation. If abnormal engine operation is detected, the ECM generates an event code. The ECM can generate an alarm or a shutdown for abnormal engine operation. These conditions are some examples of events: high inlet air temperature, low oil pressure and engine overspeed.Diagnostic - A diagnostic code is a result of a problem with the operating system or with the monitoring system. The ECM uses sensors and internal circuitry to monitor the system components. If a problem develops in a component or a wiring harness, the control system will sense the problem. The control system will notify the operator by creating a diagnostic code. Some examples of conditions that activate diagnostics are a short in a circuit for a sensor, an open circuit, or a noisy signal.Note: For detailed information on event codes and diagnostic codes, refer to the engine's Troubleshooting manual.Sensors
Sensors provide information to the engine interface box and the engine control module. The information enables the module to control the engine as efficiently as possible over a wide range of operating conditions. The information is used for monitoring engine operation via gauges and indicators on the engine interface box.The sensors also enable the activation of alarms and shutoffs in response to abnormal operation.Air Inlet Temperature
A probe for monitoring the air inlet temperature is located in the air inlet manifold. No adjustment can be made to the temperature range. Excessive inlet air temperature can activate an alarm or a shutdown.Detonation
Illustration 1 g01255077
Detonation sensor
The detonation sensors monitor the engine for detonation. One sensor is mounted in the center of each cylinder bank. The sensor produces a voltage signal that is proportional to the engine detonation. This information is processed by the engine control module in order to determine detonation levels. To eliminate detonation, the engine control module retards the engine timing, if necessary. If excessive detonation continues, the engine control module will shut down the engine.Engine Oil Pressure
Illustration 2 g01255244
(1) Oil pressure sensor for unfiltered oil
(2) Oil pressure sensor for filtered oil
(3) Oil filter housing There are two engine oil pressure sensors. The sensors are located on the top of the oil filter housing. One of the sensors measures the unfiltered oil pressure. The other sensor measures the filtered oil pressure. Low oil pressure will cause a shutdown. High differential oil pressure will also cause a shutdown.Engine Speed/Timing
Illustration 3 g00309907
Engine speed/timing sensor
The engine speed/timing sensor provides accurate information about the speed of the crankshaft and the position of the crankshaft. A