Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW (MAF) SENSOR INSPECTION [MZR 1.5]

CAUTION:
- The MAF sensor cannot be removed as a single unit. When replacing the MAF sensor, replace it together with the IAT sensor as a single unit.

1. 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.

2. 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.

- Switch the ignition to ON (engine off) and wait for 30 s.
- Verify that the MAF/IAT sensor output voltage (PID: MAF).

Specification
- 0.65 V

- If it is the specification or more, replace the MAF/IAT sensor. Service and Repair
- If it is less than the specification, go to the next step.

3. Remove the MAF/IAT sensor. Service and Repair

4. 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. Service and Repair
- If there is no foreign matter, go to the next step.





5. 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. Service and Repair
- 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.

6. Install the MAF/IAT sensor. Service and Repair