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Home >> Mazda >> 2003 >> MPV LX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0051: Left Front Ho2S Heater Circuit Low >> Detection Condition
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Detection Condition

PCM monitors control signal at terminal No. 94. If PCM turns off left front HO2S heater (does not ground circuit) but circuit has low voltage, DTC is set. This is a continuous monitor. MIL is illuminated if PCM detects malfunction in 2 consecutive drive cycles. Left front HO2S heater is controlled by a duty signal.

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