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 261 of 1176

TM 9-2320-361-24-1

0015 00

0015 00-5

HEATING SYSTEMS TROUBLESHOOTING (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. ENGINE MANIFOLD

HEATER DOES NOT

WORK (Contd)

Test 7. Test fuel pump-to-ignition coil

wiring harness.

1. Disconnect wiring harness

input to ignition coil.

2. Set multimeter to 24 VDC scale.

3. Turn power accessory switch

to the ON position and touch

multimeter negative lead to

pin B (negative) of wiring

harness at ignition coil.

4. Touch multimeter positive

lead to pin A (positive) of

wiring harness at ignition

coil.

1. If voltage is present, go to test 9.

2. If voltage is not present, go to

test 8.

Table 1. Heating Systems Troubleshooting Procedures (Contd).

FUEL PUMP

IGNITION COIL

PIN A

IGNITION COIL

WIRING HARNESS

PIN B

TEST 7

STEP 4