SCREW ASSEM. 1H3329 - Caterpillar

The 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 OCP have one 120-pin connector on the back of the control. Not all the 120 pins are used.The 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 for these purposes 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 OCP will obtain the sensor data from the engine ECM via the CAN data link.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".Reference: For information on programming the digital inputs, refer to the Systems Operation, "Digital Input Programming" section.Reference: For 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 g02942636
Illustration 2 g02942637