Visual Inspection

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION ).
2. Remove the MAF sensor/IAT sensor No. 1. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION ).
3. Visually inspect the MAF sensor for the following:
   • Damage, cracks, dirt
   • Rusted sensor terminal
   • Bent sensor terminal
   • If there is any malfunction, repair or replace the MAF sensor/IAT sensor No. 1. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION ).

Voltage Inspection

1. Remove the MAF sensor/IAT sensor No. 1 without disconnect the connector. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION ).
2. Connect the M-MDS to the DLC-2.
3. Switch the ignition ON (engine off).
4. As the air gradually approaches the MAF detection part of the MAF sensor/IAT sensor No. 1, verify that the MAF sensor output voltage (PID: MAF) varies. (See ON-BOARD DIAGNOSTIC TEST ).

Fig 1: Identifying MAF Sensor/IAT Sensor No. 1 Air Flow

Courtesy of MAZDA MOTORS CORP.

• If not as verified, replace the MAF sensor/IAT sensor No. 1. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO. 1 REMOVAL/INSTALLATION ).

Specification (Reference) 

Fig 2: MAF Sensor Output Voltage Graph

Courtesy of MAZDA MOTORS CORP.