TORSION ROD 2I6700 - Caterpillar

Fuel Injection
The programmable software inside the ECM sets certain limits on the amount of fuel that can be injected.The FRC Limit is a limit that is based on intake manifold air pressure and engine rpm. The FRC Limit is used to control the air/fuel ratio in order to control the engines exhaust emissions. When the ECM senses a higher intake manifold air pressure, the ECM increases the FRC Limit. A higher intake manifold air pressure indicates that there is more air in the cylinder. When the ECM increases the FRC Limit, the ECM allows more fuel into the cylinder.The Rated Fuel Limit is a limit that is based on the power rating of the engine and on the engine rpm. The Rated Fuel Limit enables the engine power and torque outputs to conform to the power and torque curves of a specific engine model.These limits are in the programmable software and these limits cannot be changed.The ECM controls the following characteristics:
Boost pressure
Operation of the NOx reduction systemDiagnostic Codes
When the ECM detects an electronic system problem, the ECM generates a diagnostic code. Logged diagnostic codes will be cleared from the "Logged Diagnostic Codes" screen when the code has not been active for 40 hours. Diagnostic codes are provided in order to indicate that the ECM has detected an electrical problem or an electronic problem with the engine control system. In some cases, the engine performance can be affected when the condition that is causing the code exists.If the operator indicates that a performance problem occurs, the diagnostic code may indicate the cause of the problem. Use a laptop computer to access the diagnostic codes. The problem should then be corrected.Event Codes
Event Codes are used to indicate that the ECM has detected an abnormal engine operating condition. The ECM will log the occurrence of the event code. This does not indicate an electrical malfunction or an electronic malfunction. If the temperature of the coolant in the engine is higher than the permitted limit, then the ECM will detect the condition. The ECM will then log an event code for the condition.Speed/Timing Sensors
Illustration 8 g02722354
Typical exampleThe crankshaft speed/timing sensor generates a signal by detecting the movement of the teeth that are located on the crankshaft timing ring (1) . The signal that is generated by the speed/timing sensor is transmitted to the ECM. The ECM uses the signal from the speed/timing sensor to calculate the position of the crankshaft. The signal is also used to determine the engine speed.
Illustration 9 g02722355
Typical exampleThe camshaft speed/timing sensor generates a signal that is related to the camshaft position. The camshaft speed/timing sensor detects the movement of the position wheel on the front of the camshaft (2) . The signal that is generated by the speed/timing sensor is transmitted to the ECM. The ECM calculates the speed and the rotational position of the engine by using the signal.
Illustration 10 g02259713
Schematic for speed/timing sensorWhen the engine is cranking, the ECM uses the signal from the speed/timing sensor on the