TM-9-2320-386-24-1-1
2-1/2-TON, 6X6, M44A3 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; EXTENDED SERVICE PROGRAM (ESP); UNIT, DIRECT SUPPORT AND GENERAL SUPPORT; MAINTENANCE MANUAL; VOLUME 1 OF 2
MAY 2001
TM-9-2320-386-24-1-1 - Page 82 of 1078
TM 9-2320-386-24-1-1
0012 00
0012 00-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 5. Disconnect lead 27 from temperature gauge.
Step 6. Use multimeter or 24-volt test lamp to check voltage on contact end of lead 27 at
temperature gauge.
a. Place positive lead on contact end of lead 27.
b. Place negative lead on frame ground.
c. If battery voltage is present, go to malfunction 11. Set multimeter to measure
continuity.
Step 8. Check continuity of lead 27.
a. Disconnect lead 27 from front wiring harness.
b. If continuity is not present, replace or repair lead 27 (WP 0125 00).
END OF TESTING!
16. ENGINE TEMPERATURE GAUGE INOPERATIVE
NOTE
If STE/ICE-R is available, perform NG31 – Gauge Test
(WP 0017 00).
Test 1. Test coolant temperature gauge operation.
Step 1. Disconnect lead 33 from coolant temperature sending unit.
Step 2. Turn accessory/battery switch to ON position.
Step 3. Coolant temperature gauge should read MINIMUM temperature.
Step 4. Touch contact end of lead 33 to frame ground. Coolant temperature gauge should read
MAXIMUM temperature.
Step 5. If coolant temperature gauge operates properly, go to test 3 and check temperature
sending unit.
Step 6. If coolant temperature gauge does not operate properly, go to test 2.
Test 2. Test for battery voltage into temperature gauge (malfunction 15, test 2).
Test 3. Test temperature sending unit.
Step 1. Allow coolant to cool.
Step 2. Set multimeter to measure continuity.
.
WARNING
.
Hearing protection is required for the driver and co-driver. Hearing
protection is also required for all personnel working in and around this
vehicle while the engine is running (Reference AR 40-5 and TB MED. 501).
Step 3. Start engine (TM 9-2320-386-10).
Step 4. Connect multimeter negative lead to engine ground and positive lead to temperature
sending unit. Multimeter reading should decrease as engine coolant temperature
increases.
a. If resistance does not show any decrease as temperature increases, replace
temperature transmitter (WP 0114 00).
b. If resistance does show a decrease as temperature increases, go to test 4.
Test 4. Check continuity of lead 33.
Step 1. Disconnect lead 33 from temperature gauge.
Electrical Troubleshooting (Contd)
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