TM 10-3930-675-20-1
0040 00-5
BOOM LIFTING/LOWERING TROUBLESHOOTING - CONTINUED
0040 00
Table 3. Error Code 151 - Lift Cylinder Locking Valve, Wiring Circuit Failure
Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 151 - Lift Cylinder Locking Valve,
Wiring Circuit Failure - Continued
4. Disconnect electrical leads
6002 from left lift cylinder
locking valve solenoid and
perform
voltage
check.
Voltage should be 0V with
joystick in neutral position
and 20-25V with joystick
activated to lower boom.
If voltage is as specified, replace
lift
cylinder
locking
valve
solenoid (WP 0169 00).
5. Remove engine cover and
forward junction box X167
cover.
6. Perform
voltage
check
between junction box X167
pin 14 and pin 15. Voltage
should be 0V with joystick in
neutral position and 20-25V
with joystick activated to
lower boom.
a. If voltage is as specified,
repair or replace connectors at
junction box X167 (WP 0111
00).
b. Replace
locking
valve
solenoids (6001 and 6002) if
voltage is as specified (WP
0169 00).
7. Perform
voltage
check
between connector X159 pin
2 and pin 1. Voltage should be
0V with joystick in neutral
position and 20-25V with
joystick activated to lower
boom.
If voltage is as specified, repair
or
replace
connectors
and
connectors between junction
box (X167) and connector
(X159) (WP 0111 00).
8. Check continuity between
ECU (790) connector 2 pin 10
and connector X159 pin 1 and
between
ECU
(790)
connector 2 pin 3 and
connector X159 pin 2.
If continuity is not present,
repair or replace connectors (WP
0111 00).
9. Perform voltage check at
connector X154 pin 3.
a. If 20-25V is present, check
continuity between con-
nector X154 pin 3 and ECU
(790) connector 2 pin 9.
If continuity is not present,
repair or replace connectors (WP
0111 00).
b. If voltage is not present,
check continuity between
connector X154 pin 3 and
emergency stop switch 250
pin 2.
If continuity is not present,
repair or replace connectors (WP
0111 00).
