ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10099

TM 9-2320-386-24-1-1

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

b. If continuity is not found, replace or repair wiring (WP 0125 00).

Test 5. Test continuity of fuel level sending unit.

Step 1. Set multimeter to measure continuity.

Step 2. Connect multimeter leads to fuel level sending unit.

Step 3. Position float in empty position.

a. If resistance is between 0.00 and 0.50 ohms, go to step 4.

b. If resistance is not between 0.00 and 0.50 ohms, replace fuel level sending unit

Step 4. Position float in full position.

a. If resistance is between 29.50 and 31.50 ohms, reinstall fuel level sending unit

(WP 0115 00) and recheck gauge operation.

b. If resistance is not between 29.50 and 31.50 ohms, replace fuel level sending unit

END OF TESTING!

18. OIL PRESSURE GAUGE INOPERATIVE

NOTE

If STE/ICE-R is available, perform NG31 Gauge Test

Test 1. Test oil pressure gauge operation.

Step 1. Disconnect lead 36 from oil pressure sending unit.

Step 2. Turn accessory/battery switch to ON position.

Step 3. Oil pressure gauge should show MINIMUM pressure.

Step 4. Touch contact end of lead 36 to frame ground. Oil pressure gauge should show

MAXIMUM pressure.

a. If oil pressure gauge operates properly, go to test 3.

b. If oil pressure gauge does not operate properly, go to test 2.

Test 2. Test battery voltage to oil pressure gauge (malfunction 15, test 2).

Test 3. Test oil pressure sending unit.

Step 1. Set multimeter to measure continuity.

Step 2. Connect negative lead to frame ground on engine.

Step 3. Touch positive lead to contact of oil pressure sending unit. Resistance should measure

less than 1 ohm with engine off (no oil pressure).

Step 4. If resistance is 1 ohm or more, replace oil pressure sending unit (WP 0100 00).

Step 5. If resistance is less than 1 ohm, go to step 6.

Step 6. Remove oil pressure sending unit (WP 0100 00).

Step 7. Install mechanical gauge.

Step 8. Start engine (TM 9-2320-386-10) and check oil pressure on gauge.

a. If oil pressure is 10 psi (69 kPa) or above at idle, replace oil pressure sending unit

b. If oil pressure is less than 10 psi (69 kPa) at idle, notify direct support maintenance.

Test 4. Test continuity of lead 36.