Mazda 6 Quiz
Fuel and emission control systems

Mass air flow (maf) sensor inspection

In this manual: Fuel and emission control systems
General information — 42Engine — 23Lubrication system — 10Cooling system — 9Fuel and emission control systems — 161Engine electrical system — 17Clutch — 21Manual transaxle — 10Automatic transaxle — 110Front and rear axles — 20Steering system — 15Braking system — 104Suspension — 34Body — 201Body electrical system — 287Heater and air conditioner systems — 89Technical data — 1Special tools — 1
~1min read
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

Test yourself

A quick Mazda 6 quiz: every answer comes with an explanation and a link to the manual page.