The PCM will turn off the MIL lamp when the diagnostic runs and passes in four consecutive drive cycles. The PCM will turn on the MIL lamp immediately after this monitor runs and fails. This monitor fails if the MAF correction factor is beyond it's calilbrated range.
Adjustments for air temperature and humidity are taken into consideration since they also affect the temperature of the heated wire or film. This current is changed to a frequency which is sent to the Powertrain Control Module (PCM) and interpreted as air flow. The drop in resistance allows more current to flow through it in order to maintain the programmed temperature. This means that it's resistance drops when it's temperature drops. The heated wire or film is a positive temperature coefficient (ptc) resistor. This wire is positioned in the air stream and is heated by the electrical current that the voltage produces. A constant voltage is applied to a heated wire. The Mass Air Flow Sensor is a frequency based device.
0 kommentar(er)
