TM-9-2320-361-24-1

2-1/2 TON, 6X6, M44A2 SERIES TRUCKS

TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2

AUGUST 2006

TM-9-2320-361-24-1 - Page 268 of 1176

TM 9-2320-361-24-1

0015 00

0015 00-12

HEATING SYSTEMS TROUBLESHOOTING (Contd)

Table 1. Heating Systems Troubleshooting Procedures (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

3. PERSONNEL FUEL

BURNING HEATER

INOPERATIVE

(Contd)

Test 4. Check for input power at fuel

pump.

1. Set multimeter to a range

that will measure 24 VDC.

2. Disconnect lead 25 at fuel

pump.

3. Touch multimeter positive

lead to contact end of lead 25.

4. Touch multimeter negative

lead to frame ground. Voltage

should be present.

Test 5. Check for power input at

personnel heater.

1. Set multimeter to a voltage

that will measure 24 VDC.

2. Disconnect harness connector

at personnel heater.

3. Set heater control switch to

the run position.

4. Touch multimeter positive

lead to pin A of harness

connector.

5. Touch multimeter negative

lead to frame ground.

6. Repeat steps 4 and 5 for pins

B, C, and D. Voltage should be

present at all pins tested.

1. If voltage is present, check fuel

pump for proper operation. Refer

to WP 0006 00, table 21,

malfunction 2, step 5.

2. If fuel pump is operating properly.

Go to test 5.

3. If voltage is not present, repair or

replace lead 25 (WP 0090 00).

1. If voltage is present, replace

personnel heater (WP 0351 00).

2. If voltage is not present at one or

more pins, repair or replace

harness connector (WP 0090 00).