Mass Air Flow (MAF) Sensor Inspection

NOTE:

Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. (See HOW TO USE THIS MANUAL .)

Verify the connection condition of the MAF sensor/IAT sensor connector.
- If a connector has poor contact, install it correctly and then go to the next step.
- If the connector connection is normal, go to the next step.
Verify the MAF sensor voltage under no airflow conditions using the following procedure:
- 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.
- Turn the ignition switch to the ON position and wait for 30 s.
- Verify that the MAF/IAT sensor output voltage (PID: MAF).
  - 0.68 V
  - If it is the specification or more, replace the MAF/IAT sensor. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
  - If it is less than the specification, go to the next step.
Remove the MAF/IAT sensor. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
Verify that there is no foreign matter in the MAF/IAT sensor.
- 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 INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)
  - If there is no foreign matter, go to the next step.
Fig 1: Inspecting For Foreign Matter In MAF/IAT Sensor
Verify that there is no damage, cracks, or dirt on the MAF sensor part of the MAD/IAT sensor.
- If a malfunction can be verified, repair or replace the MAF/IAT sensor. (See INTAKE-AIR SYSTEM 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.
Install the MAF/IAT sensor. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION .)