P0101

DTC P0101 Mass Air Flow (MAF) Sensor Performance

Circuit Description

The mass air flow (MAF) sensor is an air flow meter that measures the amount of air that enters the engine. It is fitted between the air cleaner and turbocharger. A small quantity of air that enters the engine indicates deceleration or idle speed. A large quantity of air that enters the engine indicates acceleration or a high load condition. The ECM will calculate a predicted MAF value and compares the actual MAF sensor voltage signal to the predicted MAF value. This comparison will determine if the signal is stuck or is too low or too high for a given operating condition. If the ECM detects that the actual MAF sensor signal voltage is not within a predetermined range of the calculated MAF value this DTC will set.

Condition for Running the DTC

^ DTCs P0016 P0027 P0079 P0080 P0097 P0098 P0102 P0103 P0112 P0113 P0116 P0117 P0118 P0201 - P0204 P0261 P0264 P0267 P0270 P02E2 P02E3 P02E7 P02E8 P02E9 P0300 P0301 - P0304 P0335 P0336 P0401 P0403 P0404 P0405 P0406 P042E P0500 P0506 P0507 P0602 P0642 P0643 P0652 P0653 P1125 P2002 P2146 - P2151 P1293 P2227 P2228 P2229 P2454 P2455 and P268A are not set.

AND following conditions are met for longer than 5 seconds.

^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.
^ The engine is running.
^ The engine speed does not vary more than 50 RPM.
^ The barometric pressure is more than 11 psi (75 kPa).
^ The intake air temperature is more than 1 9°F (-7°C).
^ The engine coolant temperature is between 149 to 198°F (65 to 92°C).
^ The EGR control is commanded OFF.
^ The intake airflow valve position is more than 50%.
^ The turbocharger control is under normal operation.
^ The exhaust brake valve is commanded OFF.
^ The DPF regeneration is not running.

Condition for Setting the DTC

^ The ECM detects that the MAF sensor signal voltage is not within a predetermined range of the calculated MAF value for longer than 8 seconds.

Action Taken When the DTC Sets

^ The ECM illuminates the MIL on the second consecutive driving cycle when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type B.
^ The ECM inhibits EGR control.
^ The ECM inhibits DPF regeneration control.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type B.

Diagnostic Aids

^ Any unmetered air that enters the engine downstream of the MAF sensor will cause this DTC to set.
^ High resistance in the MAF sensor circuit may set this DTC.
^ A short between the signal circuit of the MAF sensor and the signal circuit of the intake air temperature (IAT) sensor 1 will skew the MAF sensor lower than normal at higher air flows.

Circuit System Testing DTC P0101