TM 10-3930-675-24-1
BOOM LIFTING/LOWERING TROUBLESHOOTING - CONTINUED
0040 00
Table 6. Error Code 155 - Lift Cylinder Boom Up Valve,
Component Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 155 - Lift Cylinder Boom Up Valve, 1. Enter "DIAG SERVO" 9(13) a. If no "OUTPUT" mA values
Component Failure.
in the diagnostic menu and
display, perform
activate the boom lifting
troubleshooting steps for
function. LIFT "OUTPUT"
ERROR CODE 126.
and "INPUT" should have mA b. If no "INPUT" mA values
values during lifting function.
display, continue with step 2.
CAUTION
DIAG SERVO
9(13)
Uncontrolled function may occur with this error code.
OUTPUT/INPUT
LIFT
0mA
0mA
2. Check voltage at X158 a. If voltage (16 to 24V) is found,
LOWER
0mA
0mA
between pin 1 and pin 2 with
disconnect X158 and check
the ignition ON (WP 0048 00-
the resistance on the loose part
8). Should be 0V with the
of X158 between pin 1 and pin
joystick in the neutral position
2. Resistance should be 23 to
and 6 to 16V during the lifting
25 Ohms. Check continuity of
function.
each pin to ground.
b. If no voltage (6 to 16V) is
found, disconnect ECU (790)
connector 2 and check pin 11
for damage and check
continuity of wire A1582 and
continuity of wire to ground
(WP 0048 00-8).
c. Repair or replace damaged
shorted wires or connectors
(WP 0113 00).
d. Replace damaged ECU (790)
(WP 0080 00).
3. Move the cab to the transport a. If resistance (23 to 25 Ohms)
position (TM 10-39306-675-
is not as specified or shorted to
10). Remove the thin cover
ground, replace servo control
plate just in front of the cab
valve (WP 0250 00).
hose tray to gain access to the b. If specified resistance is
servo
Check
found, check continuity of
resistance of 6005 solenoid.
wires 1581 and 1582 and
Should be 23 to 25 Ohms.
check continuity of each wire
Check solenoid for short to
to ground (WP 0048 00-8).
ground.
c. Notify Sustainment
Maintenance to replace
damaged or open harness.
d. Replace ECU (790) (WP 0080
00).
0040 00-6
