TM 10-3930-675-20-1
0041 00-3
BOOM IN/OUT TROUBLESHOOTING - CONTINUED
0041 00
Table 1. Error Code 127 - Joystick-to-ECU (790) Failure Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 127 - Joystick-to-ECU (790) Failure
- Continued
i. Check
resistance
of
joystick
potentiometer:
joystick pin 9 to joystick pin
10 should be 1.1-1.4k
ohms; joystick pin 9 to
joystick pin 4 should be 1.7-
2.0k ohms; joystick pin 4 to
joystick pin 10 should be
1.7-2.0k ohms.
If resistance is not as specified,
replace joystick (WP 0081 00).
j. Replace ECU (790) (WP
0079 00).
2. Enter “DIAG SERVO 5 (13)”
menu and check voltage of
BOOM IN/OUT. If voltage
reads
5V,
perform
the
following steps.
a. Slowly move joystick right
and left and observe voltage
on menu. Voltage should be
1-9V.
If voltage suddenly goes out of
range when joystick is moved,
replace joystick (WP 0081 00).
b. Remove ECU (computer
790) cover from operator’s
seat base and slide ECU
mounting tray out.
c. Remove joystick cover.
d. Check
ECU
(790)
connector
1
and
tray
grounding
leads
and
joystick connector X155
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.
