DTC P0101-00: MAF Sensor Circuit Range/Performance Problem: Notes

DTC P0101:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0101:00	MAF sensor circuit range/performance problem
DETECTION CONDITION	Type A The PCM monitors mass intake air flow amount when the engine is running. If the mass intake air flow amount is above 42 g/s {5.6 lb/min} for 5 s and the engine speed is below 2, 000 RPM with the engine is running, the PCM determines that the detected mass intake air flow amount is too high. If the mass intake air flow amount is below 5.5-49.6 g/s (the value depends on engine speed.) for 5 s and the engine speed is above 1, 000 RPM with the engine is running and the throttle opening angle above 50 % with the engine is running, the PCM determines that detected the mass intake air flow amount is too low. Type B When the conditions are as follows, the PCM compares the intake airflow amount with the estimated intake airflow amount (calculated from the barometric pressure, MAP sensor and throttle opening angle). MONITORING CONDITIONS Engine speed: below 4, 500 RPM Barometric pressure divided by intake manifold absolute pressure: above 1.2 Throttle position-throttle position before 50 ms: below 10 % Battery voltage: above 8 V If over a period continuing for 5 s, the cumulative value of the intake airflow amount divided by the estimated intake airflow amount is 1.35 or more, and intake airflow amount multiplied by the estimated intake airflow amount is 6 g/s {0.8 lb/min} or more, the PCM determines that the detected mass air flow amount is above is too high. If over a period continuing for 5 s, the cumulative value of the intake airflow amount divided by the estimated intake airflow amount is 0.65 or less, and intake airflow amount multiplied by the estimated intake airflow amount is 6 g/s {0.8 lb/min} or less, the PCM determines that the detected mass air flow amount is above is too low. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM. PENDING CODE is available if the PCM detects the above malfunction condition during first drive cycle. FREEZE FRAME DATA (Mode 2)/Snapshot data is available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	-
POSSIBLE CAUSE	MAF/IAT sensor connector or terminals malfunction PCM connector or terminals malfunction MAF sensor malfunction PCM malfunction
SYSTEM WIRING DIAGRAM	-