Mazda 6 Service Manual: Intake air temperature (iat) sensor inspection

Resistance Inspection

Note

• Perform the following inspection only when directed.

1. Disconnect MAF/IAT sensor.

2. Measure the resistance between the MAF/IAT sensor terminals D and E using an ohmmeter.

• If not as specified, replace the MAF/IAT sensor.
• If the MAF/IAT sensor is okay, but the IAT PID are out of specification, perform the Circuit Open/Short Inspection.

Specification

Circuit Open/Short Inspection

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

2. 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/IAT sensor terminal D (harness-side) and PCM terminal 2E (harness-side)

- MAF/IAT sensor terminal E (harness-side) and PCM terminal 2H (harness-side)

Short circuit

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

- MAF/IAT sensor terminal E (harness-side) and power supply

- MAF/IAT sensor terminal D (harness-side) and power supply

- MAF/IAT sensor terminal D (harness-side) and body GND