TM 10-3930-675-20-1
0040 00-8
BOOM LIFTING/LOWERING TROUBLESHOOTING - CONTINUED
0040 00
Table 5. Error Code 154 - Lift Cylinder Boom Up Valve, Wiring Circuit Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 154 - Lift Cylinder Boom Up 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. Check
voltage
between
connector X158 pin 1 and pin
2. If voltage is not present,
check continuity between:
ECU (790) connector 2 pin 11
and connector X158 pin 2;
between
ECU
(790)
connector 2 pin 10 and
connector X159 pin 1; and
between connector X159 pin
1 and connector X158 pin 1.
If continuity is not present,
repair or replace connectors (WP
0111 00).
4. 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).
5. Move operators cab to
transport position and remove
transmission access covers
(WP 0135 00).
DIAG SERVO
9(13)
OUTPUT/INPUT
LIFT 0mA 0mA
LOWER 0mA 0mA