TM-9-2815-220-34 Direct Support Manual for AVDS-1790-2C and AVDS-1790-2D Engines Download

TM 9-2815-220-34 Table 2·2. oubleshooting Procedures - Continued Mallunclion Probabltuu� Fuel System Abnormal Conditions - Continued 14.8 Fuel injector noule defective: a. Abnormal spray pattern (sticky action, stuck parlially open, or orifices par- tially plued). 14.9 Fuel injector lube high pressure fuel leakage: 14.10 Fuel injecl ion pump pressur e regulating vah·e fuel return alve deftive: 14.ll Engine fuel return restriction: 114.12 Fuel return check valve defective 14.13 Aulomalic waler drain system in- operative: I 14.14 Deleted 2·20 Change 3 b. Fuel injector nonle \•aIve stuck closed or orifice plued. NOTE Can result in damaged fuel in- jection pump. c. F'ucl injeclor no1.zlc holder spring failed (result of improper installation of nozzle). d. Fuel leakage at fuel injector nonle y. a. Filling lꝏse, lubing cracked or broken. b. Fuel injector lube clamps (le or miss- ing clamps allow lube vibration result- ing in fuel leaks). a. Valve slicking or spring tension im- proper. a. Engine fuel return hose quick disconnecl coupling nol connected. b. Quick disconnect coupling, tu or hoses defective or damaged (restricting return fuel now). a. 01cck valve not seating (leaking at seat). a. System malfunction (waler not drain- ing). b. Electrical wiring defect. c. Solenoid valve defective. d ntrol unit or n defective. Wlh a tdon al. cate faulty cylinder. Refer to -2. a2. Repair or replace defective nozzle and holder assembly (para 2-48). bl. Bench tesl injector nozzle. Refer lo DT-2.2. b2. Repair or replace defective fuel injec- tor n!le and holder assembly (para 2-48). b3. 'If defective fuel i njeclor nozzle is found, lhe fuel injection pump must be tested for damage. Refer lo DT-1.5. Replace defective pump (para 2-28). cl. Locale faulty nozzle. Hefer to DT-2. c2. Hcpair or replace fuel injeclor nonle and holder aembly (para 2-<). di. Locate faulty fuel injector nozzle. Refer to DT-2.3. . Repair or replace fuel injectr nole and holder assembly (para 2-28). al. Tighten filling nut (para 2-2lb. (16)). a2. I nspcct tubing sleeve (para 3-137). a3. 'Repla defective tu (para 3-137). b. Tighten lꝏse clamps, replace damaged clamps and inslall missing clamps (para 2-21). al. Check fuel preure. Refer to -1.3. a2. Inspt and/or replace valve. Refer to TM 9-=10-212-". a. Reconnect coupling. Refer to pertinent vehicle technical manual. bl. Check relurn fuel flow. Refer lo DT-4.L b2. Replace defective coupling tu or hose. Refer to pertinent vehicle tech- nical manual. al. Remove and inspect valve for proper seating (no leakage). a2. Replace valve (para 2-2 J a (I 3)). al. 'en manual drain ck (para 2-24) and drain into container. U more than one quart of waler is drained, system is inoperative. a2. If exceive water Is found in filter, replace filter elements (para 2-24). b. 'Check voltage supply to conlrol unit and repair or replace wiring  - quired (para 21), refer to pertinent vehicle lechnical manual. c. •Apply 2 4 volts lo solenoid and check operation. If defective, replace solenoid valve (para 2-44). d. •Replace control unit and sensor - sembly (para 2-44).