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 257 of 1176

TM 9-2320-361-24-1

0015 00

0015 00-1

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. ENGINE MANIFOLD

HEATER DOES NOT

WORK

Test 1. Test engine manifold heater

ignition circuit for battery

voltage.

1. Disconnect lead 55 from

engine manifold heater

ignition unit. Manifold heater

fuel pump is now disabled.

2. Set multimeter to a voltage

range that will measure 24 VDC.

3. Turn power accessory switch

to ON position.

4. Push manifold heater switch

and hold.

5. Touch positive lead of

multimeter to contact end of

lead 55 and negative lead to

frame ground.

1. If battery voltage is present, go to

test 4.

2. If battery voltage is not present, go

to test 2.

Table 1. Heating Systems Troubleshooting Procedures.

FIELD TROUBLESHOOTING

2-1/2 TON, 6X6, M44A2 SERIES TRUCKS (MULTIFUEL)

HEATING SYSTEMS TROUBLESHOOTING

TEST 1

STEP 5

MANIFOLD HEATER

FUEL PUMP HARNESS

LEAD 55

PIN A

PIN B

FUEL PUMP

IGNITION COIL