7
3.3
Electrical Connections
The EMCP 3 control has one 70-pin connector on the back of the control. Not all 70 pins are used. The following diagrams show what pins are used and what each pin should be connected to for each version of the control. The figures below are shown with all possible connections used. For EUI engines, the passive analog inputs number 1 and 2 will not be used. These are for oil pressure and coolant temperature respectively. On EUI engines, those sensors will be wired to the engine ECM and the EMCP 3 will get that information from the engine ECM via the Primary J1939 Data Link. For more information about the passive inputs, see section 3.9, “Analog Inputs”. The figures show two different ways to connect the analog inputs. The method shown with all of the other connections is for 2-wire sensors. At the bottom right hand side of the figures, the connections for 1-wire sensors is shown. The discrete inputs are shown connected through normally open contacts to battery negative. These inputs can also be connected through normally closed contacts to battery negative. In order to do this the active state of the input will need to be set to active high. For information on how to program the digital inputs, see section 3.8, “Digital Inputs”.
