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 - Page 202 of 704

TB 9-3950-253-13&P

Change 1

0019-22

0019

ELECTRICAL SYSTEM – CONTINUED

20. TOTAL STOP OF SYSTEM (ERROR CODE 20).

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 ON position (PLS: TM 9-2320-364-14&P,

HEMTT: TM 9-2320-326-14&P).

Step 2.

Check for 24V on pin 2 of P12 in relay box.

a.

If 24V found, proceed to Step 6.

b.

If 24V not found proceed to Step 3.

Step 3.

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 4.

Disconnect loom from hydraulic control box.

Step 5.

Measure resistance between pin 2 on P12 in relay box and pin F on control box loom connector.

a.

If resistance is >200 Ohms, replace loom.

b.

If resistance is <200 Ohms, refer to vehicle TM (PLS: TM 9-2320-364-14&P, HEMTT: TM 9-

2320-326-14&P).

Step 6.

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 7.

Check 15 amp fuse in relay box.

Replace fuse if blown, continue to Step 8.

Step 8.

Set battery disconnect switch and ignition switch to ON position.

Step 9.

If fuse blows again, replace relay box (WP 0029).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

0.