DTC | P0101 | Mass or volume air flow circuit range / performance problem |
P0102 | Mass or volume air flow circuit low input | |
P0103 | Mass or volume air flow circuit high input | |
P0104 | Mass or volume air flow intermittent |
The mass air flow sensor (MAFS, A) has an intake air temperature sensor built-in and is located between the air cleaner assembly and the throttle device. The MAFS uses a hot film type sensing-element to measure the mass of intake air entering the engine. Mass air flow rate is measured by detection of heat transfer from a hot film probe. The change in air flow rate causes change in the amount of heat being transferred from the hot film probe surface to the air flow. A large amount of intake air represents acceleration or high load conditions while a small amount of intake air represents deceleration or idle. The ECM uses this information to control the EGR solenoid valve and correct the fuel amount.
DTC No | Detecting Condition & Limp Home | Suspect area |
P0101 P0102 P0103 P0104 | Detecting Condition P0101 : The value of measured air flow 780mg/st * P0101 is detected with below condition.(Driving on the way down) - 2000 ＜ rpm ＜ 3000 - The quantity of fuel injection ＜ 0 mg/st - The value of atmospheric pressure ＞ 750 hpa - -7℃ ＜ water temperature ＜120℃ P0102 : The value of measured air flow -15 kg/h P0103: The value of measured air flow 550 kg/h P0104: The value of sensor voltage ＜ 4.7 V or ＞ 5.1 V - In this case, P1522/P1523 (Sensor supply 1 voltage malfunction) or P0124 (Throttle/pedal position A circuit intermittent) is detected together. Enable Condition Engine state: running Limp Home Fuel quantity limitation | - Open or short in MAFS circuit - MAFS - ECM - EGR |
MAFS | Normal Parameter |
Engine idle state | |
Signal Voltage | Below 2.5V |
Proceed with ECM problem procedure. |
