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Home >> Mazda >> 2003 >> MPV ES >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0052: Left Front Ho2S Heater Circuit High >> Detection Condition
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Detection Condition

PCM monitors control signal at terminal No. 94. If PCM turns on left front HO2S heater (grounds circuit) and circuit has high voltage, DTC is set. This is a continuous monitor. MIL illuminates if PCM detects malfunction in 2 consecutive drive cycles. Left front HO2S heater is controlled by a duty signal.

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