Mazda 6 Service Manual: Mass air flow (maf) sensor inspection

Voltage Inspection

Note

• Perform the following inspection only when directed.

1. Visually inspect for the following on the MAF sensor.

• Damage
• Cracks
• Terminal bends
• Terminal rust

- If any of the above are found, replace the MAF sensor.

- If the MAF PID value is out of specification, carry out the Circuit Open/Short Inspection.

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION.)

2. Disconnect the MAF sensor connector.

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

Open circuit

• If there is no continuity, the circuit is open. Repair or replace the harness.

- MAF sensor terminal A (harness-side) and main relay terminal C (harness-side)

- MAF sensor terminal B (harness-side) and PCM terminal 2AC (harness-side)

- MAF sensor terminal C (harness-side) and PCM terminal 1P (harness-side)

Short circuit

• If there is continuity, the circuit is shorted. Repair or replace the harness.

- MAF sensor terminal A (harness-side) and body GND

- MAF sensor terminal C (harness-side) and power supply

- MAF sensor terminal C (harness-side) and body GND

- MAF sensor terminal B (harness-side) and power supply