Mazda CX-9 Grand Touring. Manual - part 418

side connector terminal B. 



If as specified, inspect the following: 



Fuel pump continuity  



If not within the specification, inspect the following: 



Fuel pump relay  



Wiring harnesses and connectors between battery-fuel pump relay-fuel pump  

Standard  

B+ (Ignition switch at ON)  

Fig. 35: Identifying Fuel Pump Unit Wiring Harness-Side Connector 
Courtesy of MAZDA MOTORS CORP. 

6. Disconnect the jumper wire.  

4. Complete the "AFTER SERVICE PRECAUTION". (See AFTER SERVICE PRECAUTION [MZI-

3.7].)  

CONTINUITY INSPECTION 

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)  

2. To remove the service hole cover, remove the following parts: 

1. Second-row seat (See SECOND-ROW SEAT REMOVAL/INSTALLATION .)  

2. Edge cover (See LONG SLIDER REMOVAL/INSTALLATION .)  

3. Long slider cover (See LONG SLIDER REMOVAL/INSTALLATION .)  

4. Rear heat duct No.3 (See REAR HEAT DUCT COMPONENT 

REMOVAL/INSTALLATION .)  

5. Service hole cover (See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7].)  

3. Disconnect the fuel pump unit connector.  

4. Inspect for continuity between fuel pump unit connector terminals B and D. 



If there is no continuity, replace the fuel pump unit. (See FUEL PUMP UNIT 
REMOVAL/INSTALLATION [MZI-3.7].)  



If as specified carry out the "Circuit Open/Short Inspection". 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

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Fig. 36: Identifying Fuel Pump Unit Wiring Harness-Side Connector 
Courtesy of MAZDA MOTORS CORP. 

CIRCUIT OPEN/SHORT INSPECTION 

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

Fig. 37: Identifying Main Fuse Block (Fuel Pump Relay) 
Courtesy of MAZDA MOTORS CORP. 

Fig. 38: Identifying Fuel Pump Unit Wiring Harness-Side Connector 
Courtesy of MAZDA MOTORS CORP. 

Open circuit  



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

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:00:01 AM

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© 2005 Mitchell Repair Information Company, LLC. 



Fuel pump unit terminal D and body ground  



Fuel pump unit terminal C and fuel pump relay terminal D  

Short circuit  



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



Fuel pump unit terminal D and power supply  



Fuel pump unit terminal B and body ground  

QUICK RELEASE CONNECTOR REMOVAL/INSTALLATION [MZI-3.7] 

QUICK RELEASE CONNECTOR POSITION 

Fig. 39: Identifying Quick Release Connector 
Courtesy of MAZDA MOTORS CORP. 

REMOVAL 

1. Follow "BEFORE SERVICE PRECAUTION" and remove dirt from the connecting surfaces before 

performing any work operations. (See BEFORE SERVICE PRECAUTION [MZI-3.7].)  

2. Move the retainer upward using a small flathead screwdriver or a similar tool.  

3. Pull out the fuel hose straight from the fuel pipe and disconnect it. 

WARNING:



Fuel is very flammable liquid. If fuel spills or leaks from the 
pressurized fuel system, it will cause serious injury or death and 
facility breakage. Fuel can also irritate skin and eyes. To prevent 
this, always complete the "Fuel Line Safety Procedure", while 
referring to the "BEFORE SERVICE PRECAUTION".  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:00:01 AM

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© 2005 Mitchell Repair Information Company, LLC. 

4. Cover the disconnected quick release connector and fuel pipe with vinyl sheeting or a similar material to 

prevent it from scratches or dirt. 

Fig. 40: View Of Quick Release Connector 
Courtesy of MAZDA MOTORS CORP. 

INSTALLATION 

1. Inspect the fuel hose and fuel pipe sealing surface for damage and deformation. 



If there is any malfunction, replace it with a new one.  

2. Install the quick release connector. 



Insert the fuel pipe straight to the end of the quick release connector.  



Push down the retainer using a finger. 



If the retainer cannot be pushed down, push the fuel pipe further to the quick release 
connector.  

3. Lightly pull and push the quick release connector a few times by hand, and then verify that it is connected 

securely.  

4. Inspect all related parts by performing "AFTER SERVICE PRECAUTION". (See AFTER SERVICE 

PRECAUTION [MZI-3.7].) 

Fig. 41: View Of Quick Release Connector

NOTE:



If the quick release connector O-ring is damaged or has slipped, replace 
the fuel hose.  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:00:01 AM

Page 31 

© 2005 Mitchell Repair Information Company, LLC.