See Figures 1, 2 and 3
The Mass Air Flow (MAF) sensor uses a hot wire sensing element to measure the amount of air entering the engine. Air passing over the hot wire causes it to cool. A cold wire is used to determine the ambient. The sensor compares the 2 elements and sends an analog voltage signal to the Engine Control Module (ECM). The ECM uses this signal to determine proper air/fuel mixture.
The MAF sensor is located between the air cleaner and the throttle body. The sensor hot wire sensing elements and housing are calibrated as a unit and must be serviced as a complete assembly.
- With engine running, use DVOM to verify there is at least 10.5V between terminals A and B of the MAF sensor connector. This indicates the power input to the sensor is okay.
- With engine running, use DVOM to measure voltage between MAF sensor connector terminals C and D. If the readings are about as indicated in the table, the sensor is okay. The readings may vary based on vehicle load and temperature.