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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0051: Left Front Ho2S Heater Circuit Low >> Detection Condition

Detection Condition

WARNING: This page is about a different car, the 2003 Mazda MPV and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

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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