TM10-3930-660-20 Table  2-3. Mechanical Troubleshooting (Cont’d) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION Step 2. Check ether start aid operation. a. b. c. d. Remove ether start cartridge, para.   5-18. Shake and listen for liquid splashing inside cartridge. If cartridge is empty, replace with a full one, para. 5-18. Be sure you discard the old cartridge seal and install a new one. Crank the engine and press the engine primer button for no longer than 5 seconds. Release the engine primer button and listen for ether start cartridge operation. When primer button is released, a measured amount of starting fluid from the cartridge is injected into  the  engine. If ether start aid operates, inspect ether start hose and atomizer for damage, and replace if necessary, para. 5-17. If ether start aid is not operating, place starter-run control switch in the OFF position, and disconnect cable from negative (-) battery terminal. Inspect and continuity check ether start aid electrical wiring and thermostat.   Refer to the electrical schematic, page FO-1. If necessary replace broken wire(s), para. 8-46, or defective thermostat, para. 5-19. Step 3. Check for obstructions to intake air. a. Remove and clean air cleaner intake cap. Clean air inlet tube. 2-27