Section 4 TM   9-2320-363-20-1 TROUBLESHOOTING CHARTS E.   CODE    15- OIL   OR  COOLANT TEMPERATURE SENSOR (OTS   OR  CTS)    SIGNAL VOLTAGE LOW NOTE  —   This  chart   ISonly  to  be  used   if: 1)   All  basic   mechanical checks    and   physical    inspections have   been   performed with  no  problem   found,   and 2)   Diagnosis   of  DDEC-II   was  started    at  step  Start-1   (page   3-121)   and  you  have  now  been  referred   here. 15-1 Multiple Code Check Were there  any  other  active   codes besides   Code   15? 15-2 Sensor Check l  Turn   ignition off. . Disconnect OTS or CTS connector. l  Start   engine   and    run   until “Check Engine" light comes on or    after 8   minutes. l  Read   active    codes with engine still running. 15-3 Check OTS    or  CTS Connectors .  Inspect terminals at   the OTS or CTS  connectors (both   the  sensor and  harness   side)   for  damage; bent.  corroded, and   unseated pins  or  sockets. 15-4 Check for   Short Turn   ignition off. .   Disconnect   engine   harness connector   at  the  ECM. l  Read    resistance between sockets R2   and Y2   on    the engine harness connector. l  Also    read    resistance between socket B   and a   good ground. RESULT WHAT    TO   DO   NEXT No  other  codes. Go  to  15-2. Yes,  any  or  all  of  the Go  to  ENG5V-1   (page    3-333). following    codes: 14,  23,  33. Yes -  but  none  of  the Go  to  15-2. above. Any  codes Go to  15-3. except   Code   15. Code   15  (and Go to  15-4. any  other  codes). Terminals  and Replace  OTS, page  4-323,  or CTS, connectors are  okay. page  4-238.  Then  go  to  15-30. Problem   found. Repair  terminals/connectors, page   3-2.  Then   go   to  15-30. Less  than  or Signal   line  (ckt   #120)   is  shorted equal   to  10,000  ohms to  the  return   line  (ckt#452) or on  either   reading. battery   ground.    Repair   short, page   3-2.  Then   go  to  15-30. Greater   than Go  to  15-5. 10,000  ohms   or  open on  both   readings. 3-213


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