CYLINDER GP-HYDRAULIC 3676475 - Caterpillar

Sensor Locations
Illustration 1 g00104780
(1) Fuel pressure sensor
(2) Oil pressure sensor
(3) Air pressure sensor for the inlet manifold
(4) Air temperature sensor for the inlet manifold
(5) Coolant level sensor
(6) Fuel temperature sensor
(7) Coolant temperature sensor
(8) Primary speed/timing sensor
(9) Backup speed/timing sensor
(10) Atmospheric pressure sensor Failure of Sensors
All 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 specification.Atmospheric Pressure Sensor
Atmospheric pressure sensor (10) measures the atmospheric pressure in the crankcase. A signal is sent to the Electronic Control Module (ECM).
Table 1
Atmospheric Pressure Sensor
Operating pressure range for the atmospheric pressure sensor 0 to 116 kPa (0 to 16.8 psi) Coolant Temperature Sensor
The coolant temperature sensor (7) monitors engine coolant temperature. This feature is used for engine system diagnostics with an output from the Electronic Control Module (ECM). The output of the ECM can indicate a high coolant temperature through a relay or a lamp. In addition, the sensor activates the cold start strategy which improves the startability of the engine.The minimum coolant temperature that will activate the alarm is 106°C (223°F). The switch opens as the coolant cools. A resetting procedure is not required.Failure of the Coolant Temperature Sensor
If one of the following conditions exist, a failure of the coolant temperature sensor may have occurred:
Sensor output is open.
Sensor output is shorted to ground or supply.
Measured reading of the coolant temperature is out of specification.The ECM will detect the failure of the coolant temperature sensor. The diagnostic lamp will warn the operator about the status of the coolant temperature sensor. The coolant temperature related strategies will be disabled. The failure of the coolant temperature sensor will not cause a shutdown of the engine or any horsepower change.Coolant Level Sensor
The coolant level sensor (5) monitors the engine coolant level. The sensor will detect coolant level. The coolant level sensor provides information to the ECM. The output from the ECM can indicate a low coolant level through a relay or a lamp. Coolant must be added to the cooling system in order to correct the condition. See the Operation and Maintenance Manual for more information.The system can be programmed with one of the following options:Enabled - The system will monitor the input from the coolant level sensor. The system is programmed with this value when the engine is shipped by Caterpillar.Disabled - The system will monitor the input from the coolant level sensor. All of the diagnostics that are associated with the coolant level sensor will be disabled.Failure of the Coolant Level Sensor
A failure of the coolant level sensor may occur under the following conditions:
The coolant level sensor is open.
The coolant level sensor is shorted to ground.
The coolant level sensor is shorted to supply.The failure of the coolant level sensor will not cause a shutdown of the engine or any horsepower change.Engine Oil Pressure Sensor
The