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 240 of 1176
TM 9-2320-361-24-1
0014 00
0014 00-4
INDICATORS, GAUGES, AND WARNING SYSTEM TROUBLESHOOTING (Contd)
Table 1. Indicator, Gauges, and Warning System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. ENGINE
TEMPERATURE
GAUGE
INOPERATIVE
NOTE
If STE/ICE-R is available, perform
NG31 gauge test (WP 0018 00).
Test 1. Test coolant temperature
gauge operation.
1. Disconnect lead 33 from
coolant temperature sending
unit.
2. Turn power accessory switch
to ON position.
3. Coolant temperature gauge
should read minimum
temperature.
4. Touch contact end of lead 33
to frame ground. Coolant
temperature gauge should
read maximum temperature.
Test 2. Test battery voltage into
temperature gauge. Go to
WP 0014 00, table 1,
malfunction 1, test 2.
Test 3. Test temperature-sending
unit.
1. Allow coolant to cool.
2. Set multimeter to RX 1 scale.
3. Start engine
(TM 9-2320-361-10).
4. Connect multimeter negative
lead to engine ground and
positive lead to sending unit.
Resistance reading should
decrease as engine coolant
temperature increases.
Test 4. Check continuity of lead 33.
1. Disconnect lead 33 from
temperature gauge.
2. Set multimeter to RX 1 scale.
3. Touch negative lead of
multimeter to contact end of
lead 33 at sending unit.
4. Touch positive lead of
multimeter to other end of
lead 33.
1. If coolant temperature gauge
operates properly, go to test 3 and
check sending unit.
2. If coolant temperature gauge does
not operate properly, go to test 2.
1. If resistance does not show an
decrease as temperature increases,
replace temperature sending unit
(WP 0107 00).
2. If resistance does show a decrease
as temperature increases, go to
test 4.
1. If continuity is not present, repair
or replace lead 33 (WP 0090 00).
2. If continuity is present, replace
temperature gauge (WP 0095 00).
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