LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2003 >> Protege5 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0121: Throttle Position Sensor Circuit - Range/Performance Problem >> Detection Condition
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Detection Condition

If PCM detects throttle valve opening angle is less than 12.5 percent for 5 seconds after monitoring conditions are met, PCM determines throttle valve is stuck closed.

Monitoring Conditions

If PCM detects throttle valve opening angle is more than 50 percent for 5 seconds after monitoring conditions are met, PCM determines throttle valve is stuck open.

Monitoring Conditions

This is a Continuous Monitor (CM). MIL illuminates if PCM detects malfunction condition in 2 consecutive drive cycles. Pending code is available if PCM detects malfunction condition during first drive cycle. Freeze Frame Data is available and DTC is stored in PCM memory.