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SERIES 60 SERVICE MANUAL
2.15 ELECTRONIC ENGINE CONTROL
The Detroit Diesel Electronic Control System (DDEC) controls fuel injection timing and output
by the electronic unit injectors (EUI) on the Series 60 Diesel engine. DDEC controls throttle, gas
valve and the ignition system on the Series 60G engine. The system also monitors several engine
functions using electrical sensors which send electrical signals to the Electronic Control Module
(ECM). The ECM then computes the incoming data and determines the correct fuel output and
timing for optimum power, fuel economy and emissions. The ECM also has the ability to display
warnings or shut down the engine completely (depending on option selection) in the case of
damaging engine conditions, such as low oil pressure, low coolant, or high oil temperature.
Early Series 60 engines have the DDEC system called DDEC I. Later Series 60 engines have the
2nd generation DDEC system called DDEC II. See Figure 2-78. The current engines have the
third generation DDEC system, DDEC III/IV.
Series 60 2004 Exhaust Gas Recirculation (EGR) engines will use the fifth generation of the
DDEC system, DDEC V ® Electronic Control Unit. See Figure 2-78a.
The replacement of DDEC components is based on indicated diagnostic codes leading to faulty
components. Check the Detroit Diesel Single ECM Troubleshooting Manual (6SE497) for more
complete information on diagnosis of components and system problems.
Figure 2-78
DDEC III/IV and DDEC II Electronic Control Module (ECM)
All information subject to change without notice. (Rev. 01/04)
6S E483 0303 C opy rig h t © 200 3 D ET R O IT D I ES E L CO R P O R AT IO N F ro m B ul le t in 21- 60 - 03Rev. 2- 1 51

2.15 ELECTRONIC ENGINE CONTROL
Figure 2-78a
DDEC V Electronic Control Unit
(Rev. 01/04)
All information subject to change without notice.
2- 1 52 From Bulletin 21-60-03Rev. 6S E483 0303 C opy rig h t © 200 3 D ET R O IT D I ES E L CO R P O R AT IO N

SERIES 60 SERVICE MANUAL
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All information subject to change without notice. (Rev. 01/04)
6S E483 0303 C opy rig h t © 200 3 D ET R O IT D I ES E L CO R P O R AT IO N F r om Bu ll eti n 2 1- 60- 03Rev. 2-152a

2.16 DDEC III/IV ELECTRONIC CONTROL MODULE
2.16 DDEC III/IV ELECTRONIC CONTROL MODULE
DDEC III/IV provides an indication of engine and vehicle malfunctions. The ECM continually
monitors the DDEC III/IV system. See Figure 2-79 and see Figure 2-80.
Figure 2-79
DDEC III/IV System Series 60 Diesel Engine
(Rev. 01/04)
All information subject to change without notice.
2-152b Fr o m B ul let in 21– 60– 03Re v. 6S E483 0303 C opy rig h t © 200 3 D ET R O IT D I ES E L CO R P O R AT IO N