Volvo Genset Engine Electrical Interface

by Generator D. Diesel Generator


Volvo Genset Engine Electrical Interface


Electrical interface



This document describes how the Volvo Penta industrial engines equipped with the control systems EMS and EMS2 may be controlled.


There are a number of interfaces available to control the engine. The interfaces are:


Bus interface




The common thing about the three first interfaces is that the engine is controlled over two serial communication buses. The CIU and DCU uses the bus interface to communicate with the engine.




If non Volvo Penta equipment is connected to the communication buses there is always a risk that the safety of the system is jeopardized.






BAM Broadcast Announce Message


CAN Controller Area Network


DEF Diesel Emission Fluid


EATS Engine After Treatment System


EIC Engine Interface Connector


EECU Engine Electronic Control Unit


EMS Engine Management System


EMS 2 EMS used on TAD734GE, D9,


TAD125xVE, D13 and D16 engines FMI Failure Mode Identifier


OEM Original Equipment Manufacturer

SPN Suspect Parameter Number

VP Volvo Penta

Relevant dokumentation


Electrical interface specification industrial engines EMS and EMS2

SAE J1939-73 SAE J1939-71

Engine control interface

Volvo Penta industrial engines can be controlled in three different ways. Via bus interface, CIU or DCU. The bus interface is used by those who makes there own control system that and wants to control the engine over SAE J1939 and J1587. Volvo Penta provided two different systems to control the engines, CIU that provides a number of digital/analogue outputs to control the engine. And DCU that has all buttons included in the unit but still provides some digital/analogue inputs and outputs.



This is the interface for those who wants to make there control panel or non bus based control unit.



This is the interface for those who wants a complete unit that is ready to run the engine without make any button. But the possibility to make some customization is still here.


The DCU is equipped with a display that shows engine data and diagnostics translated to text.


Electrical interface

Bus interface

8-pole deutsch connector recepticle.

Pin Description




3 Battery

4 Battery +


5 Ignition and stop request if energized to run 6 Stop request energized to stop


7 J1587A

8 J1587B

Power up sequence

The system powers up when the ignition is switched on.



A start request is addressed by the start signal. The engine will then start to crank and it will continue to do so until one of the following conditions becomes true.


The start signal goes inactive.

The engine speed exceeds a stated limit, typical about 480 rpm.

The cranking time exceeds a stated limit, typical about 20 s. 30 s for genset engines.


Bus interface


Associated message:

J1939: Start request in VP Status

J1587: Start request in PPID 98


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About Generator D. Senior   Diesel Generator

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Joined APSense since, September 11th, 2017, From Jiangsu, China.

Created on Dec 3rd 2018 03:21. Viewed 301 times.


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