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A/F Sensor Inspection

  1. Warm up the engine to normal operating temperature.
  2. Using the M-MDS, monitor the following:
    • Vehicle speed (PID: VSS)
    • Engine speed (PID: RPM)
    • A/F sensor current (PID: O2S11)
  3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3, 000 rpm or more.
  4. Verify that the A/F sensor current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure.
    Fig 1: Air Fuel Ratio (A/F) Sensor Graph
    G07868477Courtesy of MAZDA MOTORS CORP.
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