TM 10-3930-675-24-1
BOOM IN/OUT TROUBLESHOOTING
THIS WORK PACKAGE COVERS
Error Code 161 - Extension Cylinder Boom IN Control,
Error Code 127 - Joystick-to-ECU (790) Failure
Component Failure
Error Code 130 - Overload Protection System Failure
Error Code 163 - Extension Cylinder Boom OUT Con-
Error Code 160 - Extension Cylinder Boom IN Control,
trol Valve, Wiring Circuit Failure
Wiring Circuit Failure
Error Code 164 - Extension Cylinder Boom OUT Con-
trol Valve, Component Failure
INITIAL SETUP
References
TM 10-3930-675-10
Current Supply (A34738.0200) (WP 0048 00-31)
ECS Electrical Servo (A34648.0200) (WP 0048 00-
5)
NOTE
Refer to WP 0004 00 for additional troubleshooting guidance, information, and illustrations that
locate critical components.
Refer also to illustrations at end of work package for component location.
Table 1. Error Code 127 - Joystick-to-ECU (790) Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 127 - Joystick-to-ECU (790) Failure. 1. Enter diagnostic menu "DIAG a. Operate the joystick extend
SERVO 5(13)" and check IN/
and retract function slowly.
OUT voltage. Voltage should
Should have 1 to 9V over the
be around 5V with no
full range of function. If the
movement of the joystick.
voltage suddenly goes out of
range, replace joystick (WP
0082 00).
b. If no voltage (5V) is found,
DIAG SERVO
5(13)
continue with step 2.
LIFT/LOWER
5.00V
BOOM IN/OUT
5.00V
2. Inspect ECU (790) connector a. Repair or replace damaged
1. Check connector, harness
wires or connectors (WP 0113
and ECU (790) for damage.
00).
Check ECU tray ground wires. b. Replace damaged ECU (790)
(WP 0080 00).
