TM 9-2320-360-20-1 NOTE ·   The  following  chart  should  be  used  only if  DDEC  troubleshooting  was  started  on pg. 2-80 and you were referred here. ·   A  false  DDEC  historical  Code  41  may be logged   during   cold   starts   in   extremely cold environments, -50 to -26° F (-46   to   -32°C).      Typically,   the   CHECK ENGINE light will come on 8 minutes after starting  and  go  out  2-3  minutes  later.    If the    vehicle    has    been    operated    under these    conditions,    clear    the    historical codes and return the vehicle to service. CONTINUITY TEST (1) Turn ENGINE switch OFF. (2) Disconnect engine harness connector at ECM. (3) Read resistance between sockets T1 and T2 of engine harness connector. CONTINUITY TEST (1) Remove ECM (para 7-29). (2) Disconnect TRS connector. (3) Read resistance between sockets T1 and T2 on engine harness connector. (4) Read resistance between sockets T1 and ground, then between socket T2 and ground. CAUTION Use jumper wire only between terminals indicated.  Failure to comply may result in damage to DDEC components or wiring. CONTINUITY TEST (1) Disconnect TRS connector and install a jumper wire between sockets A and B of TRS harness connector. (2) Read resistance between sockets T1 and T2 on engine harness connector. Change 1  2-205