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

Mazda 6 Service Manual / Fuel and emission control systems / Control system / 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

Intake air temperature (iat) sensor inspection

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Throttle position (tp) sensor inspection

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