Operators Manual

Table Of Contents
The CPC broadcasts all information on datalinks. A certified service center
technician can access the CPC via the datalink using the Detroit Diesel Diagnostic
Link (DDDL) electronic diagnostic tool.
The CPC communicates with the MCM unit installed on the vehicle over the
proprietary datalink.
Data for specific applications is stored in the CPC. Examples include idle speed,
maximum running speed, and speed limitation.
The CPC receives data from several sources. Examples include:
Accelerator pedal position, engine brake switch
Anti-lock brake system and other electronic control units
Oil pressure, coolant temperature and others, from the MCM
From this data, instructions are computed for controlling the engine and transmitted
to the CPC via the proprietary datalink. The ACM monitors the Aftertreatment
System (ATS). When a malfunction or other problem is detected, the system selects
an appropriate response to deliver to the operator.
Motor Control Module Description - EPA10
The Motor Control Module (MCM2) is typically located on the left-hand side of
the engine.
1. Connector 1
2. Connector 2
Figure 25. Motor Control Module 2- EPA10
The MCM processes the data received from the Common Powertrain Controller
(CPC), for example the position of the Accelerator Pedal (AP), engine brake, etc.
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.
Detroit Diesel Electronic Controls (DDEC) System
62 All information subject to change without notice.
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