Mazda CX-9 Grand Touring. Manual - part 417

8. When essentially no fuel is being discharged, stop operation of the fuel pump.  

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

10. To remove the rear heat duct No.3, remove the following parts: 

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

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

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

4. Remove the rear heat duct No.3. (See REAR HEAT DUCT COMPONENT 

REMOVAL/INSTALLATION .)  

11. Remove in the order indicated in the table.  

12. Install in the reverse order of removal.  

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

3.7].)  

2WD  

Fig. 29: Identifying Fuel Pump Unit, Quick Release Connector, Service Hole Cover & Torque 
Specifications (2WD) 
Courtesy of MAZDA MOTORS CORP. 

Fig. 28: Identifying Main Fuse Block (Fuel Pump Relay) 
Courtesy of MAZDA MOTORS CORP. 

 

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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AWD  

Fig. 30: Identifying Fuel Pump Unit, Quick Release Connector, Service Hole Cover & Torque 
Specifications (AWD) 
Courtesy of MAZDA MOTORS CORP. 

FUEL PUMP UNIT DISASSEMBLY/ASSEMBLY [MZI-3.7] 

1. Disassemble in the order indicated in the table.  

2. Assemble in the reverse order of disassembly. 

Fig. 31: Identifying Fuel Filter Body, Pressure Regulator, O-Ring & Fuel Pump 
Courtesy of MAZDA MOTORS CORP. 

FUEL PUMP UNIT INSPECTION [MZI-3.7] 

CAUTION:



It is normal to hear the fuel pump operating when the ignition switch 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

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OPERATION TEST 

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel 

from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION [MZI-3.7].)  

2. Remove the fuel-filler cap. (See FUEL TANK REMOVAL/INSTALLATION [MZI-3.7].)  

3. Start the fuel pump using the following procedure:  

Using M-MDS  

1. Connect the M-MDS to the DLC-2.  

2. Turn the ignition switch to the ON position. 

Fig. 32: Connecting M-MDS To DLC-2 
Courtesy of MAZDA MOTORS CORP. 

3. Using the simulation function FP, verify that operation sound is heard from the fuel pump when FP is 

turned from OFF to ON. 



If the operation sound cannot be verified, measure the voltage at fuel pump wiring harness-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 

is turned to the ON position.  

NOTE:



To improve start ability, the fuel pump control operates the fuel pump unit 
when the ignition switch is turned to the ON position. Due to this, fuel 
pressure is rapidly increased and fuel control is stabilized.  

 

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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Fig. 33: Identifying Fuel Pump Unit Wiring Harness-Side Connector 
Courtesy of MAZDA MOTORS CORP. 

Standard  

B+ (Ignition switch at ON)  

Without using M-MDS  

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

3.7] .)  

2. Remove the fuel pump relay. 

3. Using a jumper wire, short fuel pump relay terminals C and D in the main fuse block.  

4. Connect the negative battery cable and operate the fuel pump.  

5. Verify that operation sound is heard from the fuel pump when ignition switch turn to the ON 

position. 

Fig. 34: Identifying Main Fuse Block (Fuel Pump Relay) 
Courtesy of MAZDA MOTORS CORP. 



If the operation sound cannot be verified, measure the voltage at fuel pump wiring harness-

CAUTION:



Short the specified terminals because shorting the wrong 
terminal of the main fuse block may cause malfunctions.  

 

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.