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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISSYMPTOM TROUBLESHOOTING [L3] - ENGINENO. 14 POOR FUEL ECONOMYNOTES
2010 Mazda 5 Sport, 2.3 L, Standard

No. 14 Poor Fuel Economy: Notes

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Notes
SYMPTOM TROUBLESHOOTING - NO. 14 POOR FUEL ECONOMY [L3]

14 POOR FUEL ECONOMY
DESCRIPTION  Fuel economy is unsatisfactory.
POSSIBLE CAUSE 
  • Contaminated air cleaner element
  • Improper ATF level (ATX)
  • Brake dragging
  • Clutch slippage (MTX)
  • Improper coolant level
  • Poor fuel quality
  • PCM DTC is stored
  • Engine cooling system malfunction
  • Cooling fan system malfunction
  • Ignition system malfunction
  • Spark plug malfunction
  • Excessive/inadequate fuel pressure
    • Intermittent open or short in fuel pump related circuit
    • Fuel pump mechanical malfunction
    • Fuel line restriction or clogging
    • Fuel leakage from fuel injector
    • Fuel injector is clogging
  • Improper operation of variable tumble control
  • Improper operation of variable valve timing control system
  • Improper operation of variable valve intake air control
  • Exhaust system clogging
  • Contaminated MAF sensor
  • Low engine compression
  • Improper valve timing
  • PCV valve malfunction
    WARNING: The following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read following warnings before servicing fuel system:
    • Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
    • Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this service information.

      (See BEFORE SERVICE PRECAUTION .)

      (See AFTER SERVICE PRECAUTION .)

    RENDER: 1.0x

    NO RELATED

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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.