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Last Modified: 9-16-2014 6.6 C Doc ID: RM000000PF40E3X Model Year: 2015 Model: Tundra Prod Date Range: [08/2014 - ] Title: 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass Air Flow Circuit Range / Performance Problem; 2015 MY Tundra [08/2014 - ] DTC P0101 Mass Air Flow Circuit Range / Performance Problem DESCRIPTION Refer to DTC P0102
. DTC CODE DTC DETECTION CONDITION TROUBLE AREA P0101 Conditions (a), (b), (c), (d) and (e) continue for more than 10 seconds (2 trip detection logic): (a) Engine running (b) Engine coolant temperature 70°C (158°F) or higher (c) Throttle Position (TP) sensor voltage 0.2 V or more and less than 3.6 V (d) Average engine load value ratio less than 0.85, or more than 1.29 (varies with estimated engine load) Average engine load value ratio = Average engine load based on MAF meter output / Average engine load estimated from driving conditions (e) Average air-fuel ratio less than -15%, or more than 15% Mass Air Flow (MAF) meter Air induction system PCV hose connections MONITOR DESCRIPTION the wire and an internal thermistor, affecting their resistance. To maintain a constant current value, the ECM varies the voltage applied to the wire and internal thermistor. The voltage level is proportional to the airflow through the sensor, and the ECM uses it to calculate the intake air volume. The ECM monitors the average engine load value ratio to check the MAF meter for malfunctions. The average engine load value ratio is obtained by comparing the average engine load calculated from the MAF meter output to the average engine load estimated from the driving conditions, such as the engine speed and the throttle opening angle. If the average engine load value ratio is below the threshold value, the ECM determines that the intake air volume is low, and if the average engine load value ratio is above the threshold value, the ECM determines that the intake air volume is high. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored. MONITOR STRATEGY Related DTCs P0101: Mass air flow meter rationality Required Sensors/Components (Main) Mass air flow meter Required Sensors/Components (Related) Crankshaft Position (CKP) sensor, Engine Coolant Temperature (ECT) sensor and Throttle Position (TP) sensor 3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0101; Mass A... |