TM 10-3930-675-24-1
TOPHANDLER ELECTRONIC CONTROL UNIT (ECU) (791) TROUBLESHOOTING
THIS WORK PACKAGE COVERS
Error Code 205 - Memory Failure
Error Code 250 - Internal Communication Failure, Con-
nector 3
Error Code 220 - Internal Communication Failure, Con-
nector 2
Error Code 251 - Internal Communication Failure, Con-
nector 3
Error Code 221 - Internal Communication Failure, Con-
nector 2
INITIAL SETUP
References
TM 10-3930-675-10
Current Supply (A34738.0200) (WP 0048 00-31)
ECS Attachment (A34652.0200) (WP 0048 00-23)
NOTE
Refer to WP 0004 00 for additional troubleshooting guidance, information, and illustrations that
locate critical components.
Refer also to illustration at end of work package for component location.
Table 1. Error Code 205 - Memory Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 205 - Memory Failure.
Place ignition switch in OFF
Replace ECU 791 if error code is
still present (WP 0080 00).
position for 30 seconds and then
back in ON position.
Table 2. Error Code 220 - Internal Communication Failure, Connector 2 Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 220 - Internal Communication Place ignition switch in OFF
Replace ECU 791 if error code is
still present (WP 0080 00).
Failure, Connector 2.
position for 30 seconds and then
back in ON position.
