Function Explanation (DTC Detection Outline)

• The PCM detects the oxygen concentration in the exhaust gas based on the A/F sensor signal. The PCM monitors the response speed of the A/F sensor to sudden changes in the oxygen concentration just after fuel cut control starts/ends. If the response speed of the A/F sensor is delayed, the PCM determines an A/F sensor malfunction and stores a DTC.

Courtesy of MAZDA MOTORS CORP.