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Mazda CX-9 Grand Touring. Manual - part 403

Fig. 6: Connecting M-MDS To DLC-2
Courtesy of MAZDA MOTORS CORP.

Standard

There shall be no leakage after 5 min.

4. After reinstallation, repeat step 2 - 3 in the fuel leakage inspection.

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 there is no fuel leakage from the pressurized parts.



If there is leakage, replace the fuel hoses and clips.



If there is damage on the seal on the fuel pipe side, replace the fuel pipe.

Fig. 7: Identifying Main Fuse Block (Fuel Pump Relay)

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 10:04:45 AM

Page 6

Courtesy of MAZDA MOTORS CORP.

Standard

There shall be no leakage after 5 min.

6. After repair, assemble the system and repeat Steps 4 - 5.

FUEL LINE PRESSURE INSPECTION [MZI-3.7]

1. Complete the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION [MZI-

3.7].)

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

3. Remove the fuel line schrader valve cap.

Fig. 8: Identifying Schrader Valve Cap & Fuel Distributor
Courtesy of MAZDA MOTORS CORP.

4. Turn the SST lever so that it is 90° to the hose as shown in the figure.

5. Make sure the lever of fuel pressure gauge is turned fully clockwise, then connect the SST to the schrader

valve.

6. Verify that the selector is in N position.

7. Start the fuel pump using the following procedure.

WARNING:



Fuel line spills and leakage are dangerous. Fuel can ignite and cause
serious injuries or death. Fuel can also irritate skin and eyes. To
prevent this, always complete the "BEFORE REPAIR PROCEDURE".

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:04:45 AM

Page 7

Fig. 9: Identifying SST Lever
Courtesy of MAZDA MOTORS CORP.

Using M-MDS

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

2. Connect the M-MDS to the DLC-2.

3. Using the simulation function "FP", start the fuel pump.

Fig. 10: Connecting M-MDS To DLC-2
Courtesy of MAZDA MOTORS CORP.

Without using M-MDS

1. Remove the fuel pump relay.

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

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

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 10:04:45 AM

Page 8

8. Measure the fuel line pressure, (during key on engine off (KOEO))



If not as specified, inspect the following:

Zero or low



FP circuit



Fuel line (clogging)



Fuel leakage inside pressure regulator

High



Pressure regulator

Fig. 11: Identifying Main Fuse Block (Fuel Pump Relay)
Courtesy of MAZDA MOTORS CORP.

Fuel line pressure

331-485 kPa {3.38-4.94 kgf/cm

, 48.1-70.3 psi}

9. Stop the fuel pump using the following procedure.

Using M-MDS

1. Stop the fuel pump using the "FP" simulation function.

Using M-MDS

1. Turn the ignition switch off.

2. Disconnect the negative battery cable to stop the fuel pump.

10. Disconnect the fuel pressure gauge and connect the fuel pipe.

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

3.7].)

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:04:45 AM

Page 9

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