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Home >> Mazda >> 2003 >> MX-5 Miata Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0031: Front Heated Oxygen Sensor Heater Control Circuit Low >> Detection Condition

Detection Condition

DTC is set when PCM detects low input voltage from ground side of front HO2S heater circuit after PCM turns HO2S heater circuit off. This is an intermittent monitor. MIL is illuminated when PCM detects malfunction condition in 2 consecutive drive cycles. HO2S heater is controlled by a duty signal. Pending codes is available if PCM detects malfunction during first drive cycle. Freeze Frame Data is available and DTC will store in PCM memory.

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