SHUTOFF GP-AIR 3594912 - Caterpillar

following illustrations are simplified electrical schematics of the "Electronic Control Module" (ECM) for the generator set. The schematics do not show all possible harness connectors.The EMCP 3 control has one 70-pin connector on the back of the control. Not all of the 70 pins are used. The illustrations indicate the pins that are used for each version of the control. The illustrations also provide the wiring connections for each pin that is used for each version of the control.The passive analog input number 1, that is for oil pressure, and the passive analog input number 2, that is for coolant temperature, will not be used with "Electronic Unit Injection" (EUI) engines. The coolant temperature sensor and the oil pressure sensor will be wired to the engine ECM for EUI engines that use a "Common Engine Interface". The EMCP 3 will obtain the sensor data from the engine ECM via the J1939 data link.The illustrations show two different methods in order to connect the analog inputs. The method that is shown with all of the other connections is for sensors with 2 wires. The connections for the sensors, that have only 1 wire, are shown at the bottom right hand side of the illustrations.The connections that are for the discrete inputs are shown with normally open contacts that are wired to the battery negative. The discrete inputs can also be connected to the battery negative through normally closed contacts. In order to perform the connections, the active state of the input will need to be set to "active high". ReferenceFor information on programming the digital inputs, refer to the Systems Operation, "Digital Input Programming" section.ReferenceFor additional information about the electrical system, refer to the Electrical System Schematic section of the service manual for the generator set that is being serviced.
Illustration 1 g01309357
Illustration 2 g01514111
Illustration 3 g01514113