Air Flow Meter/Sensor: Testing and Inspection

MASS AIR FLOW (MAF) SENSOR INSPECTION [13B-MSP]

NOTE:
- Before performing the following inspection, make sure to follow the troubleshooting flowchart. Initial Inspection and Diagnostic Overview

Visual Inspection

1. Visually inspect the MAF/IAT 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
- If the monitor item condition (reference) is not within the specification even though there is no malfunction, perform the "Circuit Open/Short Inspection".

Voltage Inspection

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

2. Turn the ignition switch to ON position.

3. As the air gradually approaches the MAF detection part of the MAF/IAT sensor, verify that the voltage at PCM terminal 1AK (M-MDS PID: MAF) varies.

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

Circuit Open/Short Inspection

1. Disconnect the PCM connector.

2. Disconnect the MAF/IAT sensor connector.

3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)






Open circuit

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

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

Short circuit

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

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