TM 10-3930-675-24-1
BOOM LIFTING/LOWERING TROUBLESHOOTING
THIS WORK PACKAGE COVERS
Error Code 126 - Joystick-to-ECU (790) Failure
Error Code 155 - Lift Cylinder Boom Up Valve, Com-
ponent Failure
Error Code 130 - Overload Protection System Failure
Error Code 151 - Lift Cylinder Locking Valve, Wiring
Error Code 157 - Lift Cylinder Boom Down Valve, Wir-
Circuit Failure
ing Circuit Failure
Error Code 152 - Lift Cylinder Locking Valve, Compo-
Error Code 158 - Lift Cylinder Boom Down Valve,
nent Failure
Component Failure
Error Code 154 - Lift Cylinder Boom Up Valve, Wiring
Circuit 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 126 - Joystick-to-ECU (790) Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 126 - Joystick-to-ECU (790) Failure. 1. Enter diagnostic menu "DIAG a. Operate the joystick lift and
SERVO" 5(13) and check
lower function slowly. Should
LIFT/LOWER
voltage.
have 1 to 9V over the full
Voltage should be around 5V
range of function. If the
with no movement of the
voltage suddenly goes out of
joystick.
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
