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TM 9-2320-364-20-1
2-12. INTRODUCTION TO LOGIC TREE TROUBLESHOOTING (CONT).
(4)
CEL - Check Engine Light: Mounted on the dash panel. Has two functions:
(a)
Serves as a warning lamp to tell the driver that a problem has occurred and that the truck should be
taken in for service as soon as possible.
(b)
Serves as a light bulb check and system check. The Check Engine Light (CEL) will come on for
about 5 seconds when the ENGINE switch is turned ON. If the CEL remains on, the
self-diagnostics system has detected a problem. If the problem goes away, the light will go out, but
the HISTORICAL trouble code will be stored in the DDEC ECM memory.
(5)
CGL - Check Gages Light: Mounted on the dash, it lights to warn the driver when a potential engine
damaging condition has been detected (low oil pressure, low coolant, or engine over temperature). As a
light bulb check, the CGL will come on for about 5 seconds when ignition switch is placed in the ON
position.
(6)
CKT - Circuit.
(7)
COM - Common.
(8)
DCA - Diagnostic Connector Assembly: An electrical harness on the truck which allows the STE/ICE-R
to be powered and to make measurements of key truck signals from a single connection. In addition to
many basic electrical signals such as starter voltage and current, it includes engine speed and fuel return
pressure. The STE/ICE-R can make TK measurements while connected to the DCA.
(9)
DDEC II - The Detroit Diesel Electronic Controls, second generation.
(10)
DDEC III - The Detroit Diesel Electronic Controls, third generation.
(10.1) DDEC IV - The Detroit Diesel Electronic Controls, fourth generation.
(11)
DDL - Diagnostic Data Link: The lines (wires) over which the DDEC ECM communicates information
to be read by a Diagnostic Data Reader.
(12)
DDR - Diagnostic Data Reader: The hand-held tool used for troubleshooting with the DDEC (DDR or
PRO-LINK 9000).
(13)
Diagnostics - Troubleshooting by following an exact procedure.
(14)
DL+ - Data Link, positive side. Used for communications to the Diagnostic Data Reader, as well as other
applications.
(15)
DL- - Data Link, negative side. Used for communications to the Diagnostic Data Reader, as well as
other applications.
(16)
DREQ - Diagnostic Request Terminal: The pin on the DDL connector which must be grounded to obtain
diagnostic codes (pin M).
(17)
ECM - Electronic Control Module: The brains of DDEC II and DDEC III/IV. It receives input from the
DDEC II and DDEC III/IV sensors and switches, calculates injector firing times and duration (using a
built-in computer) and fires the injectors at the appropriate times. System operates on 12 vdc with 5 vdc
input to sensors and switches back to ECM.
(18)
EEPROM - Electronically Erasable Programmable Read Only Memory: Contains the engine calibration.
(19)
EFPA - Electronic Foot Pedal Assembly.
(20)
Erratic - Intermittent.
2-128

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