TM 10-3930-675-20-1 0028 00-12 TRANSMISSION CLUTCH CIRCUIT TROUBLESHOOTING - CONTINUED 0028 00 Table 8. Error Code 720 - Clutch K3 Short Circuit to Chassis Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error  Code  720  -  Clutch  K3  Short  Circuit  to Chassis Failure 1. Remove cab transmission and steering ECU panel cover and check     transmission     ECU connector for proper connection (WP 0079 00). Connect  loose  or  disconnected connector. 2. Remove cab rear wall center panel     cover     and     check connector   X172   for  proper connections. Connect  loose  or  disconnected connectors. 3. Move cab to transport position and remove transmission   access   covers (WP 0135 00). 4. Check transmission electrical harness connector 827, located on top of transmission, for proper connection. Connect  loose  or  disconnected connectors. 5. Disconnect   connector   827, connector  X172,  and  trans- mission ECU (793) connector and  check  for  continuity  to chassis    at    all    pins    from connector 827 pin 1 thru pin 4 and at all pins from connector X172 pin 1 thru pin 7. a.  If continuity is present, repair or  replace  connectors  (WP 0111 00). b.  If   wiring   harness   must   be replaced, notify SRA. c.  If  continuity  is  not  present, notify SRA. Table 9. Error Code 721- Clutch K3 Open Circuit Failure Troubleshooting Procedures. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Error Code 721 - Clutch K3 Open Circuit Failure 1. Remove cab transmission and steering ECU panel cover and check     transmission     ECU connector for proper connection (WP 0079 00). Connect  loose  or  disconnected connector. 2. Remove cab rear wall center panel     cover     and     check connector   X172   for  proper connections. Connect  loose  or  disconnected connectors.