TM 10-3930-675-10 0020 00-27 ERROR CODES - CONTINUED 0020 00 Table 4. Error Codes - Continued. ERROR CODE DISPLAY LAYOUT DRIVER ACTION ERROR CODE EXPLANATION VEHICLE LIMITATIONS 659 Stop Vehicle Press RESET. Finish mission. Notify maintenance. Warning - Degraded Operation Short circuit to battery voltage at  output  speed  input  -  trans- mission  ECU  measures  a  volt- age   less   than   1.0V   at   speed input pin Cables defective. Sensor defective. Gearshift quality is reduced due to another control mode. (Operating mode: substitute clutch control) If there is also a failure at turbine speed, transmission ECU shifts to neutral. Limp home. 660 Stop Vehicle Press RESET. Finish mission. Notify maintenance. Warning - Degraded Operation Logical  error  at  output  speed input - transmission ECU mea- sures   internal   speed   over   a threshold    and    at    the    next moment the measured speed is zero Cables defective. Sensor defective. Gearshift quality is reduced due to another control mode. (Operating mode: substitute clutch control) If there is also a failure at turbine speed, transmission ECU shifts to neutral. Limp home. 662 Stop Vehicle Press RESET. Finish mission. Notify maintenance. Warning - Degraded Operation Output speed does not fit other speed  signals.  If  transmission is  not  in  neutral  and  shifting has finished, transmission ECU measures output speed as zero and  turbine  or  internal  speed as not equal to zero Cables defective. Sensor defective. Wrong size sensor gap. Gearshift quality is reduced due to another control mode. (Operating mode: substitute clutch control) If there is also a failure at turbine speed, transmission ECU shifts to neutral. Limp home. 684 Finish Mission Shut engine off/on. If code clears, resume mission. If code remains, notify maintenance. Warning - Degraded Operation Time-out of CAN message from display computer Cable defective. Defective display computer. Error codes from transmission ECU will not show.