TM 9-2320-272-24-1
Table 2-3. Electrical Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
29. TEMPERATURE GAUGE INOPERATIVE (COOLANT)
NOTE
If STE/ICE is available, perform NG31 - Gauge Test (para. 2-24).
Test 1. Test temperature gauge voltage. Perform malfunction 27.
Test 2. Test coolant temperature gauge sending unit.
Step 1. Allow engine to cool.
Step 2. Set multimeter to RX4 for resistance reading.
Step 3. Disconnect lead 33 from temperature sending unit.
Step 4. Start engine (TM 9-2320-272-10).
Step 5. Connect multimeter negative lead to vehicle engine ground and connect positive lead to
sending unit terminal 33. The multimeter reading should decrease as engine
temperature increases.
If resistance does not show any decrease as temperature increases, replace temperature
sending unit (para. 3-93).
Test 3. Test lead 33 continuity.
Step 1. Disconnect lead 33 from temperature gauge and temperature sending unit.
Step 2. Attach temperature gauge end of lead 33 to chassis ground,
Step 3. Set multimeter to RX1 for continuity reading.
Step 4. Connect multimeter negative lead to vehicle chassis ground and positive lead to sending
unit end of lead 33. Multimeter should read continuity.
If continuity is not present, repair lead 33 (para. 3-131).
END OF TESTING!
2-150
