SEAL-LIP TYPE 7K9202 - Caterpillar

The engine is designed for electronic control of most engine operating functions. The electronic system consists of an Electronic Control Module (ECM), the wiring harness, switches, sensors, and fuel injectors. The engine ECM receives information from the sensors and the switches on the engine. The engine ECM processes the information that is collected to control the engine. By altering the fuel delivery with the fuel injectors, the engine ECM controls the speed and the power that is produced by the engine.The following information provides a general description of the control system. Refer to the Systems Operation manual for detailed information about the control system.System Operation
Engine Governor
The ECM governs the engine. The ECM determines the timing, the injection pressure, and the amount of fuel that is delivered to each cylinder. These factors are based on the actual conditions and on the desired conditions at any given time during starting and operation.The ECM uses the throttle position sensor to determine the desired engine speed. The ECM compares the desired engine speed to the actual engine speed. The actual engine speed is determined through interpretation of the signals that are received by the ECM from the engine speed/timing sensors. If the desired engine speed is greater than the actual engine speed, the ECM requests that more fuel is injected to increase engine speed.Timing Considerations
Once the ECM has determined the amount of fuel that is required, the ECM must determine the timing of the fuel injection. Fuel injection timing is determined by the ECM after processing input from the following components:
Coolant temperature sensor
Intake manifold temperature sensor
Intake manifold pressure sensor
Atmospheric pressure sensorThe ECM adjusts timing for optimum engine performance and for the fuel economy. Actual timing and desired timing cannot be viewed with Caterpillar Electronic Technician (ET). The ECM determines the location of top center of the number one cylinder from the signals that are provided by the engine speed/timing sensors. The ECM determines when injection should occur relative to the top center. The ECM then provides the signal to the injector at the desired time.Fuel Injection
The ECM sends high-voltage signals to the injector solenoids to energize the solenoids. By controlling the timing and the duration of the high-voltage signals, the ECM can control the following aspects of injection:
Injection timing
Fuel deliveryOther ECM Functions for Performance
The ECM may also provide enhanced control of the engine for functions such as retarding the engine and controlling the cooling fan. Refer to Troubleshooting, "Configuration Parameters" for supplemental information about the systems that can be monitored by the ECM.Programmable Parameters
Certain parameters that affect engine operation may be changed with Cat ET. The parameters are protected from unauthorized changes by passwords. These parameters are either system configuration parameters or customer parameters.Some of the parameters may affect engine operation in an unusual way. An operator might not expect this type of effect. Without adequate training, these parameters may lead to power complaints or performance complaints even though the engines performance is to the specification.Customer passwords may be required to change