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 258 of 1176

TM 9-2320-361-24-1

0015 00

0015 00-2

HEATING SYSTEMS TROUBLESHOOTING (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

1. ENGINE MANIFOLD

HEATER DOES NOT

WORK (Contd)

Test 2. Test input voltage to manifold

heater switch.

1. Disconnect lead 55 at switch

input.

2. Turn power accessory switch

to ON position.

3. Connect negative lead of

multimeter to frame ground.

4. Touch positive lead of

multimeter to contact end of

lead 55.

Test 3. Test continuity of manifold

heater switch.

1. Turn power accessory switch

to OFF position.

2. Disconnect lead 55 to

manifold heater switch

output.

3. Set multimeter to RX 1 scale.

4. Connect negative lead to one

side of switch and touch

positive lead to other side.

Push manifold heater switch.

1. If battery voltage is present, go to

test 3.

2. If battery voltage is not present, go

to WP 0018 00, table 2, NG81.

1. If continuity is not present, replace

manifold heater switch

(WP 0105 00).

2. If continuity is present, reconnect

lead 55 to manifold heater switch

output and go to test 4.

Table 1. Heating Systems Troubleshooting Procedures (Contd).

TEST 3

STEP 4

TEST 3

STEP 4

MANIFOLD

HEATER SWITCH

LEAD 55