Mazda MX-5 Miata / Grand Touring. Manual - part 92

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EVAP system leak detection pump terminal A and main relay  

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EVAP system leak detection pump terminal B and body ground  

Short Circuit 



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

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EVAP system leak detection pump terminal C and body ground  

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EVAP system leak detection pump terminal D and body ground  

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EVAP system leak detection pump terminal C and power supply  

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EVAP system leak detection pump terminal D and power supply  

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EVAP system leak detection pump terminal A and body ground  

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EVAP system leak detection pump terminal B and power supply 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

  

Fig. 18: Identifying PCM Wiring Harness-Side Connector 
Courtesy of MAZDA MOTORS CORP. 

PURGE SOLENOID VALVE REMOVAL/INSTALLATION [LF] 

1. Remove the battery cover.  

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

3. Disconnect the purge solenoid valve connector.  

4. Disconnect the vacuum hose from the purge solenoid valve.  

5. Remove the purge solenoid valve from the air hose. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

  

Fig. 19: View Of Purge Solenoid Valve & Air Hose 
Courtesy of MAZDA MOTORS CORP. 

6. Install in the reverse order of removal.  

PURGE SOLENOID VALVE INSPECTION [LF] 

AIRFLOW INSPECTION 

1. Remove the purge solenoid valve without disconnecting the evaporative hose. (See PURGE 

SOLENOID VALVE REMOVAL/INSTALLATION [LF] ).  

2. Verify that the airflow is as indicated in PURGE SOLENOID VALVE AIRFLOW REFERENCE 

TABLE . 



If as specified in PURGE SOLENOID VALVE AIRFLOW REFERENCE TABLE , perform 
the CIRCUIT OPEN/SHORT INSPECTION .  



If not as specified in PURGE SOLENOID VALVE AIRFLOW REFERENCE TABLE , inspect 
the purge solenoid valve. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION 
[LF] .)  

PURGE SOLENOID VALVE AIRFLOW REFERENCE TABLE 

NOTE:



Perform the following procedure only when directed. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

  

Fig. 20: Inspecting Airflow 
Courtesy of MAZDA MOTORS CORP. 

CIRCUIT OPEN/SHORT INSPECTION 

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

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

Measured condition

Continuity between A-B

When voltage is not applied between terminals A 
and B

No airflow

When voltage is applied between terminals A 
and B

Airflow detected

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata