TM 9-2320-363-20-1 Section 2 BASIC KNOWLEDGE REQUIRED (Cont'd.) DDR - Diagnostic  Data  Reader:  The  hand  held  tool  used  for  troubleshooting  the  DDEC  system. MPSI PRO-LINK 9000. ECM - Engine  Control  Module:  The  controller  of  the  DDEC  IlI  system.    It  reads  the  engine  and vehicle  inputs,  sensors  and  switches,  calculates  injector  firing  time  and  duration,  and  fires injectors at appropriate times. EEPROM - Electrically Erasable Programmable Read Only Memory PWM - Pulsewidth Modulated: Modulated signal provided by the DDEC system. EFPA - Electronic Foot Pedal Assembly: Contains the Throttle Position Sensor. EUI - Electronic Unit Injector FPS - Fuel Pressure Sensor: Monitors Fuel Pressure. FTS - Fuel Temperature Sensor: Monitors fuel temperature. GND - Ground INJ - Injector (fuel) ISD - Idle Shutdown: Programmable feature of the DDEC III system. IVS - Idle Validation Switch: A switch used to establish the idle speed position. LSG - Limiting Speed Governor N/A - Not Applicable OLS - Oil Level Sensor: Monitors oil level. OPS - Oil Pressure Sensor: Monitors oil pressure. OTS - Oil Temperature Sensor: Monitors oil temperature. PGS - Pressure  Governor  Control:  Regulates  engine  speed  to  maintain  a  selected  external  pump pressure. PGC - Pressure   Governor   Control:   Regulates   engine   speed   to   maintain   a   selected   external pressure. PW - Pulsewidth. RES/ACCEL- Resume/Accel Switch used for cruise control. SEL - Stop Engine Light: Typically mounted on the instrument panel.  It as two functions: 1. It  is  used  as  a  warning  to  the  operator  that  a  potential  engine  damaging  condition  has  been  detected.    If  the DDEC  III  system  is  programmed  for  shutdown,  the  engine  will  shut  down  on  its  own  within  30  seconds.    The engine should not be run until the condition is corrected. 2. It is used by the operator or technician to "flash" out active trouble codes. As a light bulb check and system check, the stop engine light will come on for about 5 seconds when the ignition Is  turned on. SEO - Stop   Engine   Override:   Allows   the   stop   engine   condition   to   be   overridden   In   case   it   is required. SET/COAST- Set Coast Switch: Used in cruise control. 3-345.10  Change 3