COVER-REGULATOR HOUSING 9Y0117 - Caterpillar

Illustration 1 g01366154
Engine shutdown circuit
The components of the engine shutdown circuit are the engine shutdown switch and the Engine Electronic Control Module (Engine ECM).
Illustration 2 g03148034
(1) Engine shutdown switch
Illustration 3 g03148056
(2) Engine ECM Engine shutdown switch (1) is used on the machine to provide Engine ECM (2) with an engine shutdown mode.With the battery disconnect switch in the ON position, 24 V power is supplied from the batteries to circuit breaker 4. Circuit breaker 4 supplies 24 V power to Engine ECM (2).With key start switch in the ON position, 24 V power is supplied from the batteries to circuit breaker 12. Circuit breaker 12 supplies 24 V power to Engine ECM (2).Engine shutdown switch (1) has two sets of contacts: normally closed and normally open. Engine ECM (2) has two inputs: normally closed and normally open. When engine shutdown switch (1) is pushed to the OFF position, the inputs of the engine shutdown switch (1) contacts change state. The normally open contacts close and the normally closed contacts open. This signal from engine shutdown switch (1) is sent to Engine ECM (2). Engine ECM (2) will shut down the engine.Engine shutdown switch (1) will reset when the knob is turned clockwise.