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Page Title: Abbreviations And Commonly Used Terms
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TM 9-2320-360-20-1 2-13.  INTRODUCTION TO LOGIC TREE TROUBLESHOOTING (CONT) e. Abbreviations And Commonly Used Terms (1) A/D - Analog to Digital:  The computer inside the ECM uses an A/D converter to convert a sensor voltage into a number with which the computer can work. (2) Active Codes - These are the codes that currently keep the CHECK ENGINE indicator on.  They are read using the Diagnostic Data Reader. (3) BAT - Battery (4) CEL  -  CHECK  ENGINE  indicator:    mounted  on  the  instrument  dash   and   used   as   panel.      It   has   two functions: (a) a warning lamp to tell the driver that a problem has occurred, and that the vehicle should be taken in for service as soon as possible. (b) as  a  light  bulb  check  and  system  check  the  CHECK  ENGINE  indicator  will  come  on  for  about  five seconds when the ENGINE switch is turned ON.  If the CEL remains on, the self-diagnostic 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 ECM.  (See General Diagnostic Information) (5) CKT - Circuit (6) CLS - Coolant Level Sensor:  Monitors coolant level at the radiator tank top. (7) COM - Common 3 (8) CTS - CONTACT TEST SET:  Tool used for troubleshooting DDEC and for STE/ICE-R tests. (9) DCA - Diagnostic Connector Assembly:  An electrical harness on the vehicle which allows the STE/ICE-R to be  powered  and  to  make  measurements  of  key  vehicle  signals  from  a  single  connection.    In  addition  to many basic electrical signals such as starter voltage and current, it includes engine speed and fuel supply pressure.  The STE/ICE-R can make TK measurements at the same time that it is connected to the DCA. (10) DDEC - Second generation Engine Electronic Controls (11) DDL - Diagnostic Data Link:  The lines (wires) over which the ECM communicates information to be read by a Diagnostic Data Reader. (12) Diagnostics:  Troubleshooting by following an exact procedure. (13) DL+ - Data Link, positive side.  Used for communications to the Diagnostic Data  Reader,  as  well  as  other applications. (14) DL - Data Link, negative side (See above). (15) DREQ  -  Diagnostic  Request  Terminal:    The  pin  on  the  DDL  connector  which  must  be  grounded  to  obtain diagnostic codes (pin M). (16) ECM  -  Electronic  Control  Module:      The   brains   of   DDEC.      It   reads   the   DDEC   sensors   and   switches, calculates   injector   firing   times   and   duration   (using   a   built-in   computer),   and   fires   the   injectors   at   the appropriate times. (17) EEPROM - Electronically Erasable Programmable Read Only Memory.  Contains the engine calibration. (18) EFPA - Electronic Food Pedal Assembly:  contains the Throttle Positions Sensor (19) Erratic:  intermittent (20) EUI - Electronic Unit Injector:  replaces the Mechanical Unit Injector (MUI) 2-74  Change 2

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