SWITCH GP-START 1107883 - Caterpillar

Locations of the Sensors and Electronic Components
Illustration 1 g02149628
Typical C18 Marine Engine which is cooled with a heat exchanger
(1) Engine coolant temperature sensor
(2) Engine coolant level sensor
(3) Fuel temperature sensor
(4) Control panel
(5) Inlet manifold air temperature sensor
(6) Inlet manifold air pressure sensor
(7) J1/P1 engine control module (ECM) connector
(8) J2/P2 ECM connector
(9) ECM
(10) Engine oil pressure sensor
(11) Fuel pressure sensor
(12) Timing calibration port
(13) Speed sensor (primary)
(14) Speed sensor (secondary) Failure of Sensors
All Sensors
One of the following malfunctions may cause a failure of a sensor:
Sensor output is open.
Sensor output is shorted to "- battery" or "+ battery".
Measured reading of the sensor is not within the specification.Coolant Temperature Sensor
The coolant temperature sensor monitors engine coolant temperature. The coolant temperature sensor is used by the engine system diagnostics with an output from the Electronic Control Module. 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 procedure for resetting 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 the 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. Strategies that are related to the coolant temperature will be disabled if a failure occurs. 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 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 engine oil pressure sensor can detect engine oil pressure for diagnostic purposes. The engine oil pressure sensor sends a signal to the Electronic