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HINT: When either of these DTCs are set, the ECM enters fail-safe mode. The ECM turns off the A/F sensor Although the DTC titles say the oxygen sensor, these DTCs relate to the Air-Fuel Ratio (A/F) sensor. Sensor 1 refers to the sensor mounted in front of the Three-Way Catalytic Converter (TWC) and located The ECM provides a pulse width modulated control circuit to adjust the current through the heater. The Fig. 40: Oxygen (A/F) Sensor Heater Control Circuit Diagram DTC TROUBLE DETECTION CONDITION CHART DTC No. DTC Detection Condition Trouble Area P0031 Air-Fuel Ratio (A/F) sensor heater current less than 0.8 A (1 Open in A/F sensor heater A/F sensor heater (sensor Integration relay (A/F ECM P0032 Air-Fuel Ratio (A/F) sensor heater current fail (1 trip Short in A/F sensor heater A/F sensor heater (sensor Integration relay (A/F
2008 Toyota Tundra 2008 ENGINE PERFORMANCE Engine Control System (1GR-FE) - Tundra
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