TM 10-3930-675-20-1
0047 00-8
TOPHANDLER TWISTLOCKS AND FORKLIFT SENSOR TROUBLESHOOTING - CONTINUED
0047 00
Table 5. Error Code 246 - Tophandler Twistlock Unlocking Circuit Failure Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 246 - Tophandler Twistlock
Unlocking Circuit Failure
1. Check wires and cables from
tophandler control valve to
boom for obvious damage.
Repair or replace damaged wires
(WP 0111 00).
2. Disconnect
electrical
connector
6039
from
tophandler
twistlock
unlocking solenoid. Place
ignition
switch
to
ON
position and perform voltage
check.
If 20-25V is present at connector
6039,
replace
twistlock
unlocking solenoid (WP 0169
00).
3. Disconnect connector X189
from tophandler junction box
at end of boom. Place ignition
switch to ON position and
perform
voltage
check
between connector X189 pin
J and pin K.
a. If 20-25V is present, check
continuity between con-
nector X189 pin J and
connector 6039 pin 1 and
between connector X189
pin K and connector 6039
pin 2. Check continuity
between connector 6039
pin 1 and pin 2 and to
chassis. Check continuity
between connector X189
pin K and ECU (791)
connector 2 pin 8.
a. If continuity is not present,
repair or replace connectors
(WP 0111 00).
b. If wiring harness requires
replacement,
notify
DS
Maintenance.
b. If voltage is not present,
enter “DIAG ATTACH-
MENT 6 (16)” menu and
check
voltage
of
UNLOCKED
OUTPUT.
Voltage should be present
with joystick lock/unlock
and override switch 1005
activated
(press
switch
twice for lock and unlock).
a. If voltage is not present,
replace ECU (791) (WP 0076
00).
b. If voltage is present, notify
SRA.
DIAG TOP LIFT 6(16)
TW-LOCK OUTPUT INPUT
UNLOCKED 0.00V
0Ma
LOCKED 0.00V
0mA
