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



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



EVAP system leak detection pump terminal D and power supply



EVAP system leak detection pump terminal A and body ground



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