SHIM 1788455 - Caterpillar

Switch Locations
Illustration 1 shows the typical locations of the switches for a C7.1 (Mech) Industrial Engine. Specific engines may appear different from the illustration due to differences in applications.
Illustration 1 g02344977
(1) Coolant temperature switch
(2) Electronic control governor (if equipped)
(3) Oil pressure switch
Illustration 2 g02345016
(1) Coolant temperature switch
(2) Electronic control governor (if equipped)
(3) Oil pressure switch The illustration 2 shows the switches in position on the engine.Failure of Switches
All Switches
A failure of any of the switches may be caused by one of the following malfunctions:
Switch output is open.
Switch output is shorted to "- battery" or "+ battery".
Measured reading of the switch is out of the specification.Coolant Temperature Switch 1
The coolant temperature switch monitors engine coolant temperature. The output can indicate a high coolant temperature through a relay or a lamp. The coolant temperature sensor is used to determine initiation of the Cold Start Condition.Failure of the Coolant Temperature Switch
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.Electronic Control Governor 2 (If equipped)
If equipped, the electronic control governor controls the engine speed. Refer to Special Instruction, REHS3720, "Caterpillar Logic Control Governor One (LCG1) and Caterpillar Logic Control Governor Two (LCG2)" for more information.Engine Oil Pressure Switch 3
The engine oil pressure switch detects engine oil pressure for diagnostic purposes.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 seconds. Very Low Oil Pressure Warning
The very low oil pressure setpoint is dependent upon the engine speed.Failure of the Engine Oil Pressure Switch
The diagnostic lamp warns the user about the status of the engine oil pressure switch. The engine oil pressure-related strategies will be disabled in the event of a failure of the engine oil pressure switch. A failure of the engine oil pressure switch will not cause a shutdown of the engine or any horsepower change.