Mazda Mazda6 Workshop Manual Supplement page 381

ENGINE CONTROL SYSTEM OPERATION INSPECTION
Intake Shutter Valve Operation Inspection
1. Start the engine and warm up completely.
2. Turn off the A/C switch.
3. Connect the WDS or equivalent to the DLC-2.
4. Monitor the following PIDs using the WDS or equivalent.
— If not as specified, inspect each sensor and related harness.
ECT PID
Above 60 °C {140 °F}
MAF PID
1.7—1.9 V
RPM PID
725—825 rpm
Note
• The position of the shutter valve, VSC shutter valve and EGR valve may not be as specified when idle
speed is maintained for several minutes. If this occurs, briefly increase engine speed to 1,500 rpm and
then re-check the position at idle speed.
5. Increase the engine speed and inspect that the intake shutter valve position changes as specified.
• If not as specified, inspect the following.
— Vacuum hose
— Intake shutter solenoid valve actuator
— Intake shutter solenoid valve and related harness.
Specification
Engine speed (rpm) Intake shutter valve position
775
1,800
2,500
Above 3,400
Guide Blade Actuator Operation Inspection
1. Start the engine and warm up completely.
2. Verify that the A/C switch is off.
3. Connect the WDS or equivalent to the DLC-2.
4. Monitor the following PIDs using the WDS or equivalent.
— If not as specified, inspect each sensor and related harness.
ECT PID
Above 60 °C {140 °F}
MAF PID
1.7—1.9 V
RPM PID
725—825 rpm
ACSW PID
OFF
5. Inspect that the guide blade actuator position changes as specified.
• If not as specified, inspect the following.
— Vacuum hose
— Guide blade actuator
— VBC solenoid valve and related harness.
Specification
Engine switch Engine speed
position (rpm)
ON 775
*1
OFF 0
*2
OFF
*1 : Just after turning engine switch off
*2 : 0 to 5 seconds after turning engine switch to OFF
*3 : Guide blade actuator begins to pull back
TROUBLESHOOTING
Halfway open
Fully open
Fully open
Fully open
Guide blade
actuator position
Closed
*3
Closed
0 Open
A6E408018881230
F2
F2–229