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Home >> Kia >> 2021 >> Rio LX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (2 Of 6) >> DTC P0171-00: System Too Lean (Bank 1) >> System Inspection >> Compression Pressure Inspection >> Inspection Procedure

Inspection Procedure

  1. Warm up and stop engine.
  2. Remove the engine cover.
  3. Disconnect the injector connectors.
  4. Remove the ignition coil.
  5. Remove the spark plugs. (using a 16mm plug wrench, remove the 4 spark plugs)
  6. Check the cylinder compression pressure.
    1. Insert a compression gauge into the spark plug hole.
    2. Set the throttle plate in the wide-open position.
    3. While cranking the engine, measure the compression pressure. (always use a fully charged battery to obtain engine speed of 200 RPM or more)
    4. Repeat step  1) through  3) for each cylinder. (This measurement must be done in as short time as possible.)
    • Specification: 

    Standard: 1225.83kPa (12.5kg/cm2 , 177.79psi) (200 to 250 RPM)

    Maximum: 1078.73kPa (11.0kg/cm2 , 156.46psi)

    Difference between each cylinder: 98kPa (1.0kg/cm2 , 14psi) or less

  7. Is the measured value within specifications?

    Good 

    No Good 

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