Mazda 6 2002, Workshop Manual

Page: 113 / 1248

INTAKE-AIR SYSTEM
F–13
F
VARIABLE AIR DUCT (VAD) CONTROL SOLENOID VALVE INSPECTION (L3)
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1. Remove the VAD control solenoid valve. (See F–10 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 F–43 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
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VARIABLE AIR DUCT (VAD) CHECK VALVE (ONE-WAY) INSPECTION (L3)
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1. Remove the VAD check valve (one-way). (See F–10 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.
•
If not as specified, replace the VAD check valve (one-way).
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IDLE AIR CONTROL (IAC) VALVE INSPECTION
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Note
•
Perform the following inspection only when directed.
Operation Test
1. Carry out the “Idle Air Control Inspection”. (See F–229 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.
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