TM 9-2320-361-20 Table 2-4. Electrical Troubleshooting (Contd). MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION 30. ENGINE TEMPERATURE GAGE If STE/ICE is section VII). INOPERATIVE NOTE available, perform NG31 - gage test (chapter 2, Test 1. Test coolant temperature gage operation. Step 1. Disconnect lead 33 from coolant temperature sending unit. Step 2. Turn accessory/ignition switch to ON position. Step 3. Coolant temperature gage should read minimum temperature. Step 4. Touch contact end of lead 33 to frame ground. Coolant temperature gage should read maximum temperature. Step 5. If coolant temperature gage operates properly go to test 3 and check sending unit. Step 6. If coolant temperature gage does not operate properly, go to test 2. Test 2. Test for battery voltage into temperature gage, go to malfunction 29, test 2. Test 3. Test temperature sending unit. Step 1. Allow coolant to cool. Step 2. Set multimeter to RX1 scale. Step 3. Start engine (TM 9-2320-361-10). Step 4. Connect multimeter negative lead to engine ground and positive lead to sending unit. Multimeter reading should decrease as engine coolant temperature increases. a. If resistance does not show any decrease as temperature increases, replace temperature sending unit (para. 4-24). 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 gage. Step 2. Set multimeter to RX1 scale. Step 3. Touch negative lead of multimeter to contact end of lead 33 at sending unit. Step 4. Touch positive lead of multimeter to other end of lead 33. a. If continuity is not present, replace or repair lead 33 (para. 4-51). b. If continuity is present, replace temperature gage (para. 4-12). END OF TESTING! 2-122