Mazda MX-5 Miata / Grand Touring. Manual — part 138

Specifications)
Courtesy of MAZDA MOTORS CORP.

Removal Order Of Variable Intake Air Solenoid Valve

VARIABLE INTAKE AIR SOLENOID VALVE INSPECTION [LF]

AIRFLOW INSPECTION

1. Remove the battery cover

2. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF] .)

3. Remove the variable intake air solenoid valve. (See VARIABLE INTAKE AIR SOLENOID VALVE

REMOVAL/INSTALLATION [LF] .)

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



If not as specified, replace the variable intake air solenoid valve.



If as specified, carry out the Circuit Open/Short Inspection .

Fig. 17: Variable Intake Air Solenoid Valve Continuity Check Table
Courtesy of MAZDA MOTORS CORP.

1

Connector

2

Vacuum hose

3

Variable Intake air solenoid valve

NOTE:



Perform the following inspection only when directed.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Intake Air System - MX-5 Miata

Fig. 18: Identifying Variable Intake Air Solenoid Valve Ports
Courtesy of MAZDA MOTORS CORP.

CIRCUIT OPEN/SHORT INSPECTION

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

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

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Intake Air System - MX-5 Miata

Fig. 19: Identifying Variable Intake Air Solenoid Valve, Main Relay & PCM Connector Terminals
Courtesy of MAZDA MOTORS CORP.

Open Circuit



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



Variable intake air solenoid valve terminal B and PCM terminal 2J



Variable intake air solenoid valve terminal A and main relay

Short Circuit

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Intake Air System - MX-5 Miata



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



Variable tumble solenoid valve terminal B and power supply



Variable tumble solenoid valve terminal B and body ground



Variable tumble solenoid valve terminal A and body ground

VARIABLE TUMBLE SHUTTER VALVE ACTUATOR INSPECTION [LF]

1. Remove the service hole cover. (See EGR VALVE REMOVAL/INSTALLATION [LF] .)

2. Disconnect the vacuum hose from the variable tumble solenoid valve.

3. Connect a vacuum pump to the vacuum hose.

4. Apply vacuum and verify that the rod moves.



If the rod does not move, replace the variable tumble shutter valve actuator. (See VARIABLE
TUMBLE SHUTTER VALVE ACTUATOR REMOVAL/INSTALLATION [LF] .)

NOTE:



Verify that the variable tumble shutter valve actuator rod moves
using a mirror.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Intake Air System - MX-5 Miata