TM 10-3930-675-10 0020 00-26 ERROR CODES - CONTINUED 0020 00 Table 4. Error Codes - Continued. ERROR CODE DISPLAY LAYOUT DRIVER ACTION ERROR CODE EXPLANATION VEHICLE LIMITATIONS 655 Finish Mission Notify maintenance. Information/Maintenance Short circuit to battery voltage or    open    circuit    at    internal speed    input    -    transmission ECU measures a voltage higher than 7.0V at speed input pin Cables defective. Sensor defective. Gearshift quality is reduced due to another control mode. (Operating mode: substitute clutch control) 656 Finish Mission Notify maintenance. Information/Maintenance Short circuit to ground at inter- nal speed input - transmission ECU  measures  a  voltage  less than 0.45V at speed input pin Cables defective. Sensor defective. Gearshift quality is reduced due to another control mode. (Operating mode: substitute clutch control) 657 Press RESET Finish mission. Notify maintenance. Information/Maintenance Logical  error  at  internal  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. 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 output speed, transmission ECU shifts to neutral. Limp home. 658 Stop Vehicle Press RESET. Finish mission. Notify maintenance. Warning - Degraded Operation Short circuit to battery voltage or open circuit at output speed input - transmission ECU mea- sures   a   voltage   higher   than 12.5V 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.