Mazda MX-5 Miata / Grand Touring. Manual — part 94

Fig. 25: Identifying Heater Hose & Heater Pipe
Courtesy of MAZDA MOTORS CORP.

8. Disconnect the EGR valve connector.

9. Set the SST to the EGR valve installation bolt.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

Fig. 26: Setting SST (49 N013 001) To EGR Valve Installation Bolt
Courtesy of MAZDA MOTORS CORP.

10. Remove both EGR valve installation bolts.

11. Remove the EGR valve with the engine coolant hose.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

Fig. 27: View Of EGR Valve & Engine Coolant Hose Components (With Torque Specifications)
Courtesy of MAZDA MOTORS CORP.

12. Disconnect the engine coolant hose from the EGR valve.

13. Replace the EGR valve gasket.

14. Install in the reverse order of removal.

EGR VALVE INSPECTION [LF]

ON-VEHICLE INSPECTION

1. Verify that the buzzing sound (valve operation sound) is heard from the EGR valve when engine

cranking.



If the buzzing sound is not heard, perform the resistance inspection.

RESISTANCE INSPECTION

1. Remove the plug hole plate. (See PLUG HOLE PLATE REMOVAL/INSTALLATION [LF] .)

2. Disconnect the battery cover.

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

NOTE:



Perform the following procedure only when directed.

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

4. Disconnect the EGR valve connector. (See EGR VALVE REMOVAL/INSTALLATION [LF] ).

5. Measure the resistance between the EGR valve terminals.



If within the specification, perform out the CIRCUIT OPEN/SHORT INSPECTION .



If not within the specification, replace the EGR valve. (See EGR VALVE
REMOVAL/INSTALLATION [LF] ).

STANDARD RESISTANCE SPECIFICATIONS

Fig. 28: Identifying EGR Valve Connector Terminals
Courtesy of MAZDA MOTORS CORP.

Terminal

Resistance (ohm)

C-E

C-A
D-B

D-F

12-16

2008 Mazda MX-5 Miata Grand Touring

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata