LOCKWASHER 3B4501 - Caterpillar

Engine Sensors
Two different control panels are use in the marine C6.6 genset. Both panels can be configured in order to override the engine ECM.
Illustration 1 g01573973
(1) Coolant Temperature Sensor
(2) Intake Manifold Air Temperature Sensor
(3) Intake Manifold Pressure Sensor
(4) Fuel Pressure Sensor
(5) Oil Pressure Sensor
(6) Primary Speed/Timing Sensor
(7) Electronic Control Module (ECM)
(8) Overspeed (Magnetic Pickup)
(9) Secondary Speed/Timing Sensor
Illustration 2 g01528510
(1) Coolant Temperature Sensor
(2) Intake Manifold Air Temperature Sensor
(3) Intake Manifold Pressure Sensor
(4) Fuel Pressure Sensor
(5) Oil Pressure Sensor
Illustration 3 g01573982
(6) Primary Speed/Timing Sensor
(7) Electronic Control Module (ECM)
(8) Overspeed (Magnetic Pickup)
(9) Secondary Speed/Timing Sensor Failure of Sensors
A failure of any of the sensors may be caused by one of the following malfunctions:
Sensor output is open.
Sensor output is shorted to "- battery" or "+ battery".
Measured reading of the sensor is out of the specification.Programmable Monitoring System (PMS)
The Programmable Monitoring System determines the level of action that is taken by the Engine Control Module (ECM) (7) in response to a condition that can damage the engine. These conditions are identified by the ECM from the signals that are produced from the following sensors.
Coolant Temperature Sensor
Intake Manifold Air Temperature Sensor
Intake manifold Pressure Sensor
Fuel Pressure Sensor
Engine Oil Pressure Sensor
Primary Speed/Timing Sensor
Secondary Speed/Timing SensorCoolant Temperature Sensor 1
The coolant temperature sensor monitors engine coolant temperature. The output of the ECM (7) can indicate a high coolant temperature through a relay or a lamp. The coolant temperature sensor is used by the ECM to determine initiation of the Cold Start Condition.Failure of the Coolant Temperature Sensor
The ECM (7) will detect a failure of the coolant temperature sensor. The diagnostic lamp will warn the operator about the status of the coolant temperature sensor. A failure of the coolant temperature sensor will not cause a shutdown of the engine or any horsepower change. In order to check the correct operation of the sensor, refer to Troubleshooting, "Engine Temperature Sensor Circuit - Test".Intake Manifold Air Temperature Sensor 2
The intake manifold air temperature sensor measures the inlet air temperature. A signal is sent to the electronic control module (ECM) (7). The intake manifold air temperature sensor is also used by the ECM to determine initiation of the Cold Start Strategy.In order to check the correct operation of the sensor, refer to Troubleshooting, "EngineTemperature Sensor Circuit - Test".Intake Manifold Pressure Sensor 3
The intake manifold pressure sensor measures boost pressure in the inlet air manifold. A signal is sent to the ECM (7).Fuel Pressure Sensor 4
The fuel pressure sensor measures the fuel pressure in the fuel manifold. A signal is sent to the ECM (7).Engine Oil Pressure Sensor 5
The engine oil pressure sensor is an absolute pressure sensor that measures the engine oil pressure in the main oil gallery. The engine oil pressure sensor detects engine oil pressure for diagnostic purposes. The engine oil pressure sensor sends a signal to the ECM (7).Low Oil Pressure Warning
The setpoint for the low pressure warning is dependent upon the engine speed. The fault will be active and logged only if the engine has been running for more than 8