ENGINE AR-COMPLETE 1468585 - Caterpillar

Injection Actuation Pressure Control Valve
The Injection Actuation Pressure Control Valve regulates the high pressure oil system that drives the hydraulic electronic unit injectors. The Injection Actuation Pressure Sensor indicates the actual injection actuation pressure to the ECM.The ECM sends a pulse width modulated signal to the Injection Actuation Pressure Control Valve. The ECM adjusts this signal to the injection actuation pressure control valve to maintain the desired actuation pressure. The current of the signal varies between 0 and 800 milliamperes.The ECM calculates the desired injection actuation pressure based on the calculated fuel quantity, injection timing, engine speed, and the engine operating mode. The engine operating mode is either the cold mode or the warm mode.The Injection Actuation Pressure Control Valve Signal is Pulse Width Modulated and operates between 0 and 800 milliamperes.Coolant Temperature Sensor
The standard Coolant Temperature Sensor is used to monitor engine coolant temperatures. The engine response to high coolant temperature is determined by a customer programmable parameter on the Service/Monitoring System Screen.Cold Mode
The ECM uses the coolant temperature to determine the cold mode operation. When the engine control system is in cold mode, the following characteristics of engine operation are changed to improve operation of a cold engine:* The timing is advanced.* The actuation pressure for fuel injection is increased.* The fuel quantity is limited.The cold mode operation is activated whenever the coolant temperature is below 18 °C (64 °F). The cold mode remains active until one of the following changes occurs:* The coolant temperature increases above 18 °C (64 °F).* The engine has been running for a period of 12 minutes.High Coolant Temperature Warning/Derate Effect on Engine Operation
The E017 High Coolant Temperature Warning Event code is activated at 106 °C (223 °F). If a High Coolant Temperature Warning is active, the ECM begins by logging an E017 Event Code. Then the ECM warns the operator by turning on the Warning Lamp to indicate a problem has been detected by the Engine Monitoring System. The warning will stay active until the coolant temperature has dropped below the warning set point.The E015 High Coolant Temperature Derate Event code is activated at 110 °C (230 °F). If a High Coolant Temperature Derate is active, the ECM begins by logging an E015 Event Code. Then the ECM warns the operator by flashing the Warning Lamp to indicate a problem has been detected by the Engine Monitoring System. Thirty seconds after the E015 was logged, the ECM will begin derating the engine by reducing the available power as shown in the derate graph. Once the coolant temperature has dropped below the derate set point, the available power will return at the same rate at which it was reduced.Figure 18 - Derate Graph for High Coolant Temperature Oil Pressure Sensor
The lack of oil pressure does not prevent the ECM from starting the engine. The ECM monitors the oil pressure after engine start up. The ECM may display a Low Oil Pressure Warning immediately after starting the engine. However, the diagnostic code