TM 10-3930-675-20-1 0044 00-2 TOPHANDLER LEVELING TROUBLESHOOTING - CONTINUED 0044 00 Table 1. Error Code 128 - Joystick-to-ECU (790) Failure Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 128 - Joystick-to-ECU (790) Failure - Continued b. Check ECU (790) connector 1 and tray grounding leads for proper connections. a. Connect any loose or disconnected connections. Push  ECU  mounting  tray  in and install cover. b. Repair or replace any damaged connectors (WP 0111 00). Push ECU mounting tray in and install cover. c. Check     voltage     between connector  X155  pin  3  and pin 13. d. If voltage in step c was not the   same   as   on   “DIAG SERVO    6    (13)”    menu, check   continuity   between ECU (790) connector 1 pin 11 and connector X155 pin 3 and between ECU (790) connector   1   pin   26   and connector X155 pin 13. If    continuity   is    not    present, repair or replace connectors (WP 0111 00). e. Remove joystick cover and disconnect  connector  from joystick. f.  Check  continuity  between joystick   connector   pin   9 and connector X155 pin 12 and between connector X155 pin 12 and connector X155 pin 14. If    continuity   is    not    present, repair or replace connectors (WP 0111 00). g. Check  continuity  between connector X155 pin 14 and ECU    (790)    connector    1 pin 27 and between joystick connector pin 10 and connector X155 pin 13. If    continuity   is    not    present, repair or replace connectors (WP 0111 00). h. Check  continuity  between joystick  connector  pin  11 and connector X155 pin 3. If    continuity   is    not    present, repair or replace connectors (WP 0111 00).