These data are evaluated together with the data from the sensors on the engine,
such as coolant and fuel temperature and oil and charge pressure. The data is then
compared to the characteristic maps or lines stored in the MCM. From these data,
quantity and timing of injection are calculated.
NOTE:
To obtain a replacement MCM, all the data given on the MCM label
are required.
The MCM data label has the 10 digit engine serial number.
Figure 7. Motor Control Module Label
Common Powertrain Controller
The Common Powertrain Controller (CPC) communicates with any other Motor
Control Module (MCM) unit installed on the vehicle over the J1939 data link.
Data for specific applications is stored in the CPC. These include idle speed,
maximum running speed, and speed limitation. From these data, instructions are
computed for controlling the engine and transmitted to the CPC via the proprietary
datalink.
The CPC receives data from the following sources:
• The operator (accelerator pedal position, engine brake switch)
• Other electronic control units (for example, the anti-lock brake system)
• The MCM (oil pressure and coolant temperature)
DD Platform EuroIV Operators Manual
All information subject to change without notice.
39
DDC-SVC-MAN-0175
Copyright © 2014 DETROIT DIESEL CORPORATION
