Mass Air Flow (MAF) Sensor Inspection

• If a connector has poor contact, install it correctly and then go to the next step.
• If a connector connection is normal, go to the next step.

1. Connect the M-MDS to the DLC-2.
   CAUTION: Do not create suction in the exhaust pipe by cranking the engine and causing air to flow through the exhaust duct. It could cause a measurement error because the MAF sensor voltage is measured under no airflow conditions.
2. Turn the ignition switch to the on position and wait for 30 s.
3. Verify that the MAF/IAT sensor output voltage (PID: MAF).

Specification 

0.68 V 

• If it is in the specification or more, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION .)
• If it is less than the specification, go to the next step.

1. Shine light on the sensor (Direction A in figure below) in the flow path and verify visually.
   • If there is visible, large foreign matter, replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION .)
   • If there is no foreign matter, go to the next step.

• If a malfunction can be verified, repair or replace the MAF/IAT sensor. (See MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR REMOVAL/INSTALLATION .)
• If a malfunction cannot be verified, go to the next step (MAF sensor is normal).
  NOTE: Install the removed MAF/IAT sensor because the MAF sensor is normal.
Fig 1: MAF Sensor Inspection
Courtesy of MAZDA MOTORS CORP.