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HOMESERVICE MANUALSKIA2015K900 V8REPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSENGINE CONTROL/FUEL SYSTEM - GENERAL INFORMATION - 5.0LTROUBLESHOOTINGBASIC TROUBLESHOOTINGSYMPTOM TROUBLESHOOTING GUIDE CHART
2015 Kia K900 V8

Symptom Troubleshooting Guide Chart

2015 Kia K900 V8SECTION Symptom Troubleshooting Guide Chart
ENGINE CONTROLS/FUEL SYSTEM TROUBLESHOOTING

Main symptom Diagnostic procedure Also check for
Unable to start
(Engine does not turn over)
  1. Test the battery. (Refer to Engine Electrical System - "BATTERY ")
  2. Test the starter. (Refer to Engine Electrical System - "STARTER ")
  3. Inhibitor switch (A/T) or clutch start switch (M/T)
  
Unable to start
(Incomplete combustion)
  1. Test the battery. (Refer to Engine Electrical System - "BATTERY ")
  2. Check the fuel pressure

    (Refer to Fuel Delivery System - "FUEL PRESSURE TEST ")

  3. Check the ignition circuit.

    (Refer to Engine Electrical System - "IGNITION SYSTEM - 5.0L ")

  4. Troubleshooting the immobilizer system.

    (In case of immobilizer lamp flashing)
  • DTC
  • Low compression
  • Intake air leaks
  • Slipped or broken timing belt
  • Contaminated fuel
Difficult to start
  1. Test the battery. (Refer to Engine Electrical System - "BATTERY ")
  2. Check the fuel pressure

    (Refer to Fuel Delivery System - "FUEL PRESSURE TEST ")

  3. Check the ECT sensor and circuit (Check DTC)
  4. Check the ignition circuit.

    (Refer to Engine Electrical System - "IGNITION SYSTEM - 5.0L ")
  • DTC
  • Low compression
  • Intake air leaks
  • Contaminated fuel
  • Weak ignition spark
Poor idling
(Rough, unstable or incorrect Idle)
  1. Check the fuel pressure.

    (Refer to Fuel Delivery System - "FUEL PRESSURE TEST ")

  2. Check the Injector. (Refer to Engine Control System - "INJECTOR ")
  3. Check the long term fuel trim and short term fuel trim

    (Refer to CUSTOMER DATASTREAM)

  4. Check the idle speed control circuit (Check DTC)
  5. Inspect and test the Throttle Body
  6. Check the ECT sensor and circuit (Check DTC)
  • DTC
  • Low compression
  • Intake air leaks
  • Contaminated fuel
  • Weak ignition spark
Engine stall
  1. Test the battery. (Refer to Engine Electrical System - "BATTERY ")
  2. Check the fuel pressure.

    (Refer to Fuel Delivery System - "FUEL PRESSURE TEST ")

  3. Check the idle speed control circuit (Check DTC)
  4. Check the ignition circuit.

    (Refer to Engine Electrical System - "IGNITION SYSTEM - 5.0L ")

  5. Check the CKPS Circuit (Check DTC)
  • DTC
  • Intake air leaks
  • Contaminated fuel
  • Weak ignition spark
Poor driving
(Surge)
  1. Check the fuel pressure. (Refer to Fuel Delivery System - "FUEL PRESSURE TEST ")
  2. Inspect and test Throttle Body
  3. Check the ignition circuit.

    (Refer to Engine Electrical System - "IGNITION SYSTEM - 5.0L ")

  4. Check the ECT Sensor and Circuit (Check DTC)
  5. Test the exhaust system for a possible restriction.

    (Refer to Engine Mechanical System - "EXHAUST MANIFOLD ")

  6. Check the long term fuel trim and short term fuel trim

    (Refer to CUSTOMER DATASTREAM)
  • DTC
  • Low compression
  • Intake air leaks
  • Contaminated fuel
  • Weak ignition spark
Knocking
  1. Check the fuel pressure.

    (Refer to Fuel Delivery System - "FUEL PRESSURE TEST ")

  2. Inspect the engine coolant.

    (Refer to Engine Mechanical System - "COOLANT ")

  3. Inspect the radiator and the electric cooling fan.

    (Refer to Engine Mechanical System - "RADIATOR ")

  4. Check the spark plugs.

    (Refer to Engine Electrical System - "IGNITION SYSTEM - 5.0L ")
  • DTC
  • Contaminated fuel
Poor fuel economy
  1. Check customer's driving habits Is
    • A/C on full time or the defroster mode on?
    • Are tires at correct pressure?
    • Is excessively heavy load being carried?
    • Is acceleration too much, too often?
  2. Check the fuel pressure.

    (Refer to Fuel Delivery System - "FUEL PRESSURE TEST ")

  3. Check the injector. (Refer to Engine Control System - "INJECTOR ")
  4. Test the exhaust system for a possible restriction
  5. Check the ECT sensor and circuit
  • DTC
  • Low compression
  • Intake air leaks
  • Contaminated fuel
  • Weak ignition spark
Hard to refuel
(Overflow during refueling)
  1. Inspect the fuel filler hose/pipe
    • Pinched, kinked or blocked?
    • Filler hose is torn
  2. Inspect the fuel tank vapor vent hose between the EVAP. canister and air filter
  3. Check the EVAP. canister
  • Malfunctioning gas station filling nozzle (If this problem occurs at a specific gas station during refueling)
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.