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