TM 10-3930-675-20-1
0040 00-11
BOOM LIFTING/LOWERING TROUBLESHOOTING - CONTINUED
0040 00
Table 6. Error Code 155 - Lift Cylinder Boom Up Valve, Component Failure
Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 155 - Lift Cylinder Boom Up Valve,
Component Failure - Continued
8. Check continuity between
connector X159 pin 1 and
connector X158 pin 1.
If continuity is not present,
repair or replace connectors (WP
0111 00).
9. Enter DIAG SERVO 9 (13)
menu and check current of
OUTPUT
LIFT.
Current
should
be
present
with
joystick activated to raise
boom.
If current is not present, replace
ECU (790) (WP 0079 00).
Table 7. Error Code 157 - Lift Cylinder Boom Down Valve, Wiring Circuit Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 157 - Lift Cylinder Boom Down
Valve, Wiring Circuit Failure
1. Remove ECU (790) cover
from operators seat base and
slide ECU mounting tray out
(WP 0079 00).
2. Check ECU (790) connector
2 and tray grounding leads for
proper connection.
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.
3. Perform
voltage
check
between connector X158 pin
3 and pin 4. If voltage is not
present,
perform
the
following continuity checks:
a. Check continuity between
ECU (790) connector 2 pin
4 and connector X158 pin 4
and between ECU (790)
connector 2 pin 10 and
connector X159 pin 1.
If continuity is not present,
repair or replace connectors (WP
0111 00).
DIAG SERVO
9(13)
OUTPUT/INPUT
LIFT 0mA 0mA
LOWER 0mA 0mA