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 259 of 1176

TM 9-2320-361-24-1

0015 00

0015 00-3

HEATING SYSTEMS TROUBLESHOOTING (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. ENGINE MANIFOLD

HEATER DOES NOT

WORK (Contd)

Test 4. Test manifold heater spark

plug.

1. Remove manifold heater

spark plug (WP 0065 00 or

WP 0066 00).

2. Connect jumper wire from

spark plug to engine ground.

3. Disconnect wiring harness

from manifold heater fuel

pump.

4. Turn power accessory switch

to ON position.

5. Position manifold heater

switch to START.

Test 5. Test manifold spark plug

cable.

1. Remove cable from manifold

heater spark plug

(WP 0065 00 or WP 0066 00).

2. Remove spark plug cable at

ignition coil.

3. Set multimeter to RX 1000

scale.

4. Touch multimeter negative

lead to contact end of spark

plug cable at the plug.

1. If spark plug does arc, go to test 9.

2. If spark plug does not arc, replace

spark plug. (WP 0065 00 or

WP 0066 00) and repeat test 4.

3. If retest of test 4 fails to produce an

arc to engine, go to test 5.

Table 1. Heating Systems Troubleshooting Procedures (Contd).

MANIFOLD

HEATER SPARK

MANIFOLD

HEATER

SPARK PLUG

TEST 5

STEPS 4

AND 5

FUEL PUMP

IGNITION COIL