TB-9-3950-253-13-P

PALLETIZED LOAD SYSTEM TRUCK, M1075 and M1075A1 (PLS) AND HEAVY EXPANDED MOBILITY TACTICAL TRUCK, M1120, M1120A2, AND M1120A4 (HEMTT), ENHANCED CONTAINER HANDLING UNIT (E-CHU)

TECHNICAL BULLETIN; OPERATOR AND FIELD MAINTENANCE, INSTALLATION INSTRUCTIONS, AND REPAIR PARTS AND SPECIAL TOOLS LIST

JULY 2009
TB-9-3950-253-13-P

  TB-9-3950-253-13-P - Page 205 of 704

0019-25
Change 1
TB 9-3950-253-13&P
0019
ELECTRICAL SYSTEM – CONTINUED
23. NO HOOK LIFT FUNCTION (ERROR CODE C1).
NOTE
When ignition switch is turned on after battery disconnect switch has been turned off and
back on, error codes 1 and 24 may alternately display for one minute. This error code
indicates that temporary settings were lost while battery disconnect switch was off, and is
consistent with normal operation.
Step 1.
Set ignition switch and battery disconnect switch to OFF position (PLS: TM 9-2320-364-14&P,
HEMTT: TM 9-2320-326-14&P).
Step 2.
Disconnect stowage interface loom from vehicle control box (WP 0029).
Step 3.
Disconnect vehicle wiring harness from stowage interface loom (WP 0029) and connect vehicle
wiring harness to vehicle control box.
Step 4.
Start engine and set MODE switch to AUTO position (PLS: TM 9-2320-364-14&P, HEMTT: TM
9-2320-326-14&P).
Step 5.
Fully extend hook arm and middle frame (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-2320-326-
14&P).
a.
If hook arm and middle frame do not operate correctly, refer to vehicle TM (PLS: TM 9-
2320-364-14&P, HEMTT: TM 9-2320-326-14&P).
b.
If hook arm and middle frame operate correctly, return hook arm to home position and pro-
ceed to Step 6.
Step 6.
Set ignition switch and battery disconnect switch to OFF position.
Step 7.
Disconnect vehicle wiring harness from vehicle control box (WP 0029).
Step 8.
Connect vehicle wiring harness to stowage interface loom, and connect stowage interface loom
to vehicle control box (WP 0029).
Step 9.
Check hook arm sensor for illuminated LED when hook arm is in home position.
If LED is illuminated, replace hook arm sensor (WP 0034).
Step 10.
Check hook arm sensor for damage, loose connection or damaged wiring harness.
a.
Tighten or repair sensor mounting or connection.
b.
Replace harness if damaged.
Step 11.
Calibrate hook arm sensor (WP 0034).
If error code is still displayed, replace hook arm sensor (WP 0034).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
0.


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