Mazda 6 Service Manual: Idle air control (iac) valve inspection

Mazda 6 Service Manual / Fuel and emission control systems / Intake-air system / Idle air control (iac) valve inspection

Note

Perform the following inspection only when directed.

Operation Test

Carry out the Idle Air Control Inspection. (See Idle Air Control System Inspection.)

If not as specified, perform the further inspection for the IAC valve.

Resistance Inspection

1. Disconnect the negative battery cable.

2. Disconnect the IAC valve connector.

3. Measure the resistance between the IAC valve terminals using an ohmmeter.

If not as specified, replace the IAC valve. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
If as specified but the Operation Test is failed, carry out 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.

- IAC valve terminal A (harness-side) and PCM terminal 4G

- IAC valve terminal B (harness-side) and PCM terminal 4J

Short circuit

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

- IAC valve terminal A (harness-side) and power supply

- IAC valve terminal A (harness-side) and GND

- IAC valve terminal B (harness-side) and power supply

- IAC valve terminal B (harness-side) and GND

Variable air duct (vad) check valve (one-way) inspection (l3)

1. Remove the VAD check valve (one-way). (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION) 2. Blow through A and verify that air flows from B. 3. Blow through B and verify that air does not flow from A ...

Variable intake-air system (vis) shutter valve actuator inspection (l3)

1. Remove the air hose. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.) 2. Disconnect the vacuum hose from the VIS shutter valve actuator. 3. Connect a vacuum pump to the VIS shutter valve actuator. ...

Other materials:

Mazda 6 Service Manual: Cooling system service warnings
COOLING SYSTEM SERVICE WARNINGS Warning Never remove the radiator cap or loosen the radiator drain plug while the engine is running, or when the engine and radiator are hot. Scalding coolant and steam may shoot out and cause serious injury. It may also damage the engine and cooling sys ...

Mazda 6 Service Manual: Foot Brake
This vehicle has power-assisted brakes that adjust automatically through normal use. Should power-assist fail, you can stop by applying greater force than normal to the brake pedal. But the distance required to stop will be greater than usual. WARNING Do not coast with the engine stalled or t ...