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.

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.

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.

Circuit Open/Short Inspection
1. Disconnect the PCM connector.




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