The Mass Air Flow Sensor (MAFS) is located between the air cleaner assembly and the throttle body. The MAFS uses a hot film type sensing element to measure the mass of intake air entering the engine. This hot film type air flow sensor consists of a hot film sensor, housing and metering ducts. 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. A large amount of intake air represents acceleration or high load conditions while a small amount of intake air represents deceleration or idle. The mass of intake air should increase at acceleration and be stable during constant engine speed. The PCM uses this information to determine the injection duration and ignition timing for the desired air/fuel ratio.
PCM sets DTC P0103 if the PCM detects signal voltage higher than the possible range of a properly operating MAF sensor.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Voltage range check | ● Open in ground harness. ● Short to battery in signal harness. ● Contact resistance in connections. ● Faulty MAF sensor. |
Enable Conditions | ● 10 ≤ Battery voltage ≤ 16V ● Engine speed ＞ Approx. 540 rpm | |
Threshold Value | ● Measured MAF ＞ 650 kg/h | |
Diagnostic Time | ● 10 revolutions. |
Test Comdition | MAF(V) | MAF(kg/h) | TPS(V) | TPS(㏀) |
Idle | 0.6 ~ 1.0 | 11.66 ~ 19.85 | 0.2 ~ 0.8 | 0.71 ~ 1.38 |
3000 rpm | 1.7 ~ 2.0 | 43.84 ~ 58.79 | - | - |
W.O.T | - | - | 4.3 ~ 4.8 | 0.2 ~ 3.4 |
