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Engine Controls - System & Component Testing: Diagnosis Kia Sedona I

Testing & Diagnostics 4 illustrations ~574 words

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 28) Replace injectors that do not meet specification. To replace injectors, see appropriate FUEL DELIVERY PIPE & FUEL INJECTORS under FUEL SYSTEM 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 article.

Scheme 26

Scheme 26
Scheme 26

FUEL INJECTOR LEAKAGE TEST

  1. Remove fuel injectors together with fuel rail. For fuel injectors removal, see FUEL DELIVERY PIPE & FUEL INJECTORS under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Using wire, secure fuel injectors to fuel rail see scheme 52 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 40- see scheme 42.
  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 27

Scheme 27
Scheme 27

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 FUEL DELIVERY PIPE & FUEL INJECTORS under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION article. Secure fuel injectors to fuel rail. see scheme 52 Place end of injector to be tested in graduated cylinder.
  2. If using injector tester, connect injector tester between battery and injector. see scheme 53 If not using injector tester, reconnect injector connectors. Connect jumper wire between injector to ECM wire and ground. See WIRING DIAGRAMS 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 28

Scheme 28
Scheme 28

System Inspection

  1. Warm engine to normal operating temperature, and let it idle. Remove Positive Crankcase Ventilation (PCV) valve from cylinder head cover port. With PCV valve attached to vent hose, block PCV valve opening and check for vacuum. Seetest procedure No. 1 in see scheme 74. If no vacuum is felt, check for blockage or collapsed vent hose, or restricted PCV valve. For vent hose problem, replace or repair as necessary. For PCV valve problem, go to next step.
  2. For plug in type PCV valve. Note direction of valve installation. Remove PCV valve from vent hose. Blow air into port "A", verify that air comes out of port "B". Blow air into port "B", verify that no air comes out of port "A". Seetest procedure No. 2 in see scheme 74. If problem is found, clean or replace PCV valve as necessary. For PCV valve screw-on type, go to next step.
  3. For screw-on type PCV valve. Remove PCV valve from vent hose. From threaded side insert a thin stick into PCV valve to check if plunger moves. See test procedure No. 3 in see scheme 74. If plunger does not move, PCV valve will be clogged. Clean or replace as necessary.

Scheme 29

Scheme 29
Scheme 29

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