Mazda 6 Service Manual: Variable air duct (vad) control solenoid valve inspection (l3)

1. Remove the VAD control solenoid valve. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)

2. Inspect airflow between the ports under the following conditions.

• If not as specified, replace the VAD control solenoid valve.
• If as specified, carry out the Circuit Open/Short Inspection.

Circuit Open/Short Inspection

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

2. Inspect the following wiring harness for open or short (continuity check).

Open circuit

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

- VAD control solenoid valve terminal B (harness-side) and PCM terminal 4C

- VAD control solenoid valve terminal A (harness-side) and main relay terminal C (harness-side)

Short circuit

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

- VAD control solenoid valve terminal B (harness-side) and body GND

- VAD control solenoid valve terminal A (harness-side) and power supply