1. MAF
MAFS(Mass Air Flow Sensor) is a hot-film type, and is mounted between air-cleaner and throttle body, which measures the amount of air flow getting into the engine. It is composed of tube, sensor assembly, and honey cell. Once the laminar stream which was generated by honey cell flows around the hot-film, the convective heat transfer is generated from hot-film, and the energy loss of MAFS is generated by this heat transfer. ECU calculates the amount of intake air flow using measuring this energy loss.
ECU sets P0103 when the signal line of digital MAF sensor is short to power or open circuit.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
MAF sensor is short to power or open circuit. | 1. MAP Sensor 2. Poor connection 3. Open circuit of power line or short circuit to ground 4. Open circuit of signal line or short circuit to ground |
EnableConditions |
•
Battery voltage is higher than 10V and lower than 16V.
•
No DTC of self-diagnosis for MAFS | |
Threshold value |
•
No repetition of sensor signal
•
Voltage of sensor signal is low. | |
Diagnosis Time |
•
2 sec | |
MIL On Condition |
•
Second driving cycle (MIL On) |
MAFS(Kg/h) | MAFS signal(Hz) |
10 | 2012.7 |
12 | 2055 |
15 | 2116 |
20 | 2209.4 |
30 | 2370 |
40 | 2507.8 |
50 | 2631.3 |
60 | 2745.6 |
75 | 2906 |
90 | 3508 |
105 | 3204.7 |
120 | 3348.5 |
140 | 3537.9 |
160 | 3727 |
190 | 4013.9 |
Fig. 1) Normal waveform of MAFS at idle. (600rpm & 11kg/h)
Fig. 2) Normal waveform of MAFS at acceleration. (2080rpm & 34kg/h)
Fig. 3) Normal data of MAFS at idle.
Fig. 4) Normal data of MAFS at acceleration.
