Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW (MAF) SENSOR INSPECTION [LF]

NOTE:
- Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart. Description and Operation

Visual inspection

1. Visually inspect the MAF sensor for the following:

- Damage, cracks
- Rusted sensor terminal
- Bent sensor terminal

- If there is any malfunction, replace the MAF/IAT sensor. Service and Repair

Voltage Inspection

1. Remove the MAF/IAT sensor without disconnecting the MAF/IAT sensor connector.

2. Turn the ignition switch to the ON position.

3. As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the MAF sensor output voltage (M-MDS PID: MAF) varies.

- If it cannot be verified even though the related wiring harnesses have no malfunction, replace the MAF/IAT sensor. Service and Repair

Circuit Open/Short Inspection

1. Disconnect the PCM connector. Service and Repair

2. Inspect the following wiring harness for open or short circuit (continuity Inspection).






Open circuit

- If there is no continuity, there is an open circuit, Repair or replace the wiring harness.

- MAF/IAT sensor terminal A and PCM main relay
- MAF/IAT sensor terminal B and PCM terminal 1P
- MAF/IAT sensor terminal C and PCM terminal 1AK

Short circuit

- If there is continuity, there is a short circuit. Repair or replace the wiring harness.

- MAF/IAT sensor terminal A and body ground
- MAF/IAT sensor terminal B and power supply
- MAF/IAT sensor terminal C and power supply
- MAF/IAT sensor terminal C and body ground

Specification