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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 P0121: Throttle Position Sensor Stuck Closed/Open >> 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.

If PCM detects throttle valve opening is less than 12.5 percent with engine coolant temperature more than 158°F (70°C) and Mass Airflow (MAF) sensor signal more than 88.3 gram/sec., PCM determines throttle valve is stuck closed. If PCM detects engine speed is more than 500 RPM with MAF sensor signal less than 89.3 gram/sec., PCM determines throttle valve is stuck open. This is a continuous monitor. MIL is illuminated if PCM detects malfunction in two consecutive drive cycles.

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