TM 10-3930-675-24-1
BOOM LIFTING/LOWERING TROUBLESHOOTING - CONTINUED
0040 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 1. Enter "DIAG SERVO" 9(13) a. If no "OUTPUT" mA values
Valve, Wiring Circuit 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.
2. Check voltage at X158 a. If voltage (16 to 24V) is found,
between pin 3 and pin 4 with
disconnect X158 and check
the ignition ON (WP 0048 00-
the resistance on the loose part
DIAG SERVO
9(13)
OUTPUT/INPUT
8). Should be 0V with the
of X158 between pin 3 and pin
LIFT
0mA
0mA
joystick in the neutral position
4. Resistance should be 23 to
LOWER
0mA
0mA
and 6 to 16V during the
25 Ohms.
lowering function.
b. If no voltage (6 to 16V) is
found, disconnect ECU (790)
connector 2 and check pin 4
for damage and check
continuity of wire A1584 (WP
0048 00-8).
c. Repair or replace damaged
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, replace
10). Remove the thin cover
servo control valve (WP 0250
plate just in front of the cab
00).
hose tray to gain access to the b. If specified resistance is
servo
Check
found, check continuity of
resistance of 6004 solenoid.
wires 1583 and 1584 (WP
Should be 23 to 25 Ohms.
0048 00-8).
c. Notify Sustainement
Maintenance to replace
damaged or open harness.
d. Replace ECU (790) (WP 0080
00).
0040 00-7
