Engine Controls - Basic Diagnostic Procedures: Diagnosis Kia Sedona I

VISUAL INSPECTION

Visually inspect all electrical wiring, looking for chafed, stretched, cut or pinched wiring. Ensure electrical connectors fit tightly and are not corroded. Inspect condition of battery and fuses. Ensure vacuum hoses are properly routed and are not pinched or cut. To verify routing and connections (if necessary), see VACUUM DIAGRAMS article. Inspect air induction system for possible vacuum leaks.

Fuel Injector Inspection

1. Warm up engine and let idle. Using screwdriver or stethoscope, listen to each injector. Clicking sound should be heard. If no sound is heard, measure resistance of each injector. (Scheme 1) Replace injectors that do not meet specification. To replace injectors, see appropriate FUEL DELIVERY PIPE & FUEL INJECTORS under «FUEL SYSTEM»(ref-133270-S27934469392002022000000) in REMOVAL, OVERHAUL & INSTALLATION article. If injectors are okay, and no operational sound is heard. Go to next step.
2. Check wiring to injectors. Ensure electrical connectors fit tightly and are not corroded. For circuit testing, see «WIRING DIAGRAMS»(ref-133271) article.

Scheme 1

Fuel Injector Leakage Test

1. Remove fuel injectors together with fuel rail. For fuel injectors removal, see appropriate FUEL DELIVERY PIPE & FUEL INJECTORS under «FUEL SYSTEM»(ref-133270-S27934469392002022000000) in REMOVAL, OVERHAUL & INSTALLATION article. Using wire, secure fuel injectors to fuel rail. (Scheme 2) Leave harness connected to fuel injectors.
2. Ensure fuel hoses are connected to fuel rail. To operate fuel pump, jumper DLC terminals FUEL PUMP and (B+). On Optima & Magentis (Canadian), DLC is located on left side under dash. On all other models, DLC is located on left side of engine compartment. see scheme 1- see scheme 3.
3. Turn ignition on. Tilt injectors 60 degrees and watch for leaks. Replace any injectors that leak. Use new "O" rings when installing injectors.

Scheme 2

Fuel Injector Volume Test

Note. Injector volume specification for Optima & Magentis (Canadian), Rio and Sedona is not available from manufacturer.

1. Remove fuel injectors together with fuel rail. For fuel injectors removal, see appropriate FUEL DELIVERY PIPE & FUEL INJECTORS under «FUEL SYSTEM»(ref-133270-S27934469392002022000000) in REMOVAL, OVERHAUL & INSTALLATION article. Secure fuel injectors to fuel rail. (Scheme 2) Place end of injector to be tested in graduated cylinder.
2. If using injector tester, connect injector tester between battery and injector. (Scheme 3) If not using injector tester, reconnect injector connectors. Connect jumper wire between injector to ECM wire and ground. See «WIRING DIAGRAMS»(ref-133271) article for wire colors.
3. Turn ignition on. Time injector flow and measure volume. Injector flow should be 4.4 oz. (130 ml) per minute. If volume is not as specified, replace injector. Use NEW "O" rings when installing injectors.

Scheme 3

BASE IGNITION TIMING INSPECTION

Note. Base ignition timing is not adjustable. The following procedure is for inspection only.

Note. Before base ignition timing inspection. Ensure base idle speed is within specifications. See IDLE SPEED SPECIFICATIONS table under BASE IDLE SPEED INSPECTION/ADJUSTMENT.