Mazda MX-5 Miata / Grand Touring. Manual - part 91

Fig. 14: View Of Bracket & EVAP System Leak Detection Pump 
Courtesy of MAZDA MOTORS CORP. 

8. Install in the reverse order of removal.  

EVAPORATIVE HOSE INSTALLATION NOTE 

1. Fit the evaporative hose onto the respective fittings, and install clamps as shown in Fig. 15. 

1. Insert the evaporative hose securely to the nipple.  

2. Inspect the evaporative hose for damage and deformation. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

  

Fig. 15: Inserting Evaporative Hose Securely To Nipple 
Courtesy of MAZDA MOTORS CORP. 

EVAPORATIVE EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP 
INSPECTION [LF] 

AIRFLOW INSPECTION 

1. Remove the battery cover.  

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

3. Remove the EVAP system leak detection pump. (See EVAPORATIVE EMISSION (EVAP) SYSTEM 

LEAK DETECTION PUMP REMOVAL/INSTALLATION [LF] .).  

4. Blow air into port A and verify that there is airflow from port B. 



If not as specified, replace the EVAP system leak detection pump. (See EVAPORATIVE 
EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP REMOVAL/INSTALLATION 
[LF] ).  

5. Blow air into port B and verify that there is airflow from port A. 



If not as specified, replace the EVAP system leak detection pump. (See EVAPORATIVE 

NOTE:



Perform the following procedure only when directed. 

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

  

EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP REMOVAL/INSTALLATION 
[LF] ).  



If as specified, perform the following "RESISTANCE INSPECTION".  

Fig. 16: Identifying Evaporative Emission System Leak Detection Pump Ports 
Courtesy of MAZDA MOTORS CORP. 

RESISTANCE INSPECTION 

1. Inspect resistance of the EVAP system leak detection pump. 



If not as specified, replace the EVAP system leak detection pump. (See EVAPORATIVE 
EMISSION (EVAP) SYSTEM LEAK DETECTION PUMP REMOVAL/INSTALLATION 
[LF] ).  



If as specified, carry out the CIRCUIT OPEN/SHORT INSPECTION .  

EVAP SYSTEM LEAK DETECTION PUMP TERMINALS RESISTANCE SPECIFICATIONS 

Terminals

Resistance (ohm)

A-B

20-50

A-C

26.6-32.4

A-D

MAX. 118

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata

  

Fig. 17: Identifying EVAP System Leak Detection Pump Connector Terminals 
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 circuit (continuity check).  

Open Circuit 



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



EVAP system leak detection pump terminal C and PCM terminal 1V  



EVAP system leak detection pump terminal D and PCM terminal 1U  

 

2008 Mazda MX-5 Miata Grand Touring 

2008 ENGINE PERFORMANCE Emission System - MX-5 Miata