Mazda CX 7. Manual — part 123

FUEL SYSTEM [L3 WITH TC]

01-14–13

01-14

FUEL PUMP UNIT DISASSEMBLY/ASSEMBLY[L3 WITH TC]

id011439801000

Warning

• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and

damage. Fuel can also irritate skin and eyes. To prevent this, do not damage the sealing surface of
the fuel pump unit when removing or installing.

1. Disassemble in the order indicated in the table.
2. Assemble in the reverse order of disassembly.

.

End Of Sie

FUEL PUMP UNIT INSPECTION[L3 WITH TC]

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Continuity Inspection

Note

• Perform the following test only when directed.

1. Disconnect the negative battery cable.
2. Remove the rear seat cushion.
3. Remove the service hole cover.
4. Disconnect the fuel pump unit connector.

5. Inspect for continuity between fuel pump unit

connector terminals B and D.

• If there is no continuity, replace the fuel pump

body.

• If as specified, carry out the “Circuit Open/

Short Inspection”.

1

Fuel filter body

2

Fuel pressure regulator

3

Fuel pump

4

Transfer

5

Filter

5

2

3

4

1

R

R

R

R

acxuuw00002338

SERVICE HOLE COVER

acxuuw00000510

FUEL PUMP UNIT PUMP
SIDE CONNECTOR

A

B

C

D

acxuuw00000034

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FUEL SYSTEM [L3 WITH TC]

01-14–14

Circuit Open/Short Inspection

1. Inspect the following wiring harnesses as 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.

— Fuel pump unit terminal B and fuel pump relay terminal A

— Fuel pump unit terminal D and body ground

Short circuit

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

— Fuel pump unit terminal B and power supply

— Fuel pump unit terminal B and body ground

— Fuel pump unit terminal D and power supply

Fuel Pump Hold Pressure Inspection

Warning

• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injuries or death and

damage. Always carry out the following procedure with the engine stopped.

Caution

• Disconnecting/connecting the quick release connector without cleaning it may cause damage to

the fuel pipe and quick release connector. Always clean the quick release connector joint area
before disconnecting/connecting using a cloth or soft brush, and make sure that it is free of
foreign material.

Note

• Perform the following test only when directed.

1. Complete the “BEFORE REPAIR PROCEDURE”. (See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH

TC].)

2. Disconnect the negative battery cable.
3. Remove the battery and battery tray.

Caution

• The quick release connector may be damaged if the tab is bent excessively. Do not expand the tab

over the stopper.

4. Disconnect the quick release connector from the fuel tank. (See01-14-19 QUICK RELEASE CONNECTOR

REMOVAL/INSTALLATION[L3 WITH TC].)

5. Turn the lever 90

° against the hose of the SST to

plug the SST outlet.

6. Push the SST quick release connector into the

fuel pipe until a click is heard.

7. Set the fuel hose into a container to avoid fuel

spills.

A

E

C

D

FUSE BOX

(FUEL PUMP RELAY)

FUEL PUMP UNIT

WIRING HARNESS SIDE CONNECTOR

A

B

C

D

acxuuw00000035

TO FUEL TANK

LEVER

49 N013 101A

49 B019 901B

49 N013 102A

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FUEL SYSTEM [L3 WITH TC]

01-14–15

01-14

8. Start the fuel pump using the following procedure.

Using M-MDS

1. Connect the negative battery cable.
2. Connect the M-MDS to the DLC-2.
3. Using the simulation function “FP”, start the

fuel pump.

Without using M-MDS

1. Remove the fuel pump relay.

Caution

• Short the specified terminals because

shorting the wrong terminal of the main
fuse block may cause malfunctions.

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.

9. Turn the ignition switch to the LOCK position.

10. Measure the fuel pump hold pressure after 5

min.

• If not as specified, replace the fuel pump after

inspecting the following:

— Fuel line for clogging or leakage

Fuel pump hold pressure

More than 230 kPa {2.3 kgf/cm

2

, 33 psi}

11. Disconnect the jumper wire.
12. Disconnect the SST.
13. Connect the quick release connector. (See01-14-19 QUICK RELEASE CONNECTOR REMOVAL/

INSTALLATION[L3 WITH TC].)

End Of Sie

FUEL PUMP RESISTOR REMOVAL/INSTALLATION[L3 WITH TC]

id011439801200

1. Disconnect the negative battery cable. (See 01-17-2 BATTERY REMOVAL/INSTALLATION[L3 WITH TC].)
2. Remove the air cleaner. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC].)
3. Disconnect the fuel pump resistor connector.
4. Remove in the fuel pump resistor.

5. Install in the order as shown in the figure.

Tightening torque

4.2— 6.2 N·m {43— 63 kgf·cm, 38— 54 in·lbf}

6. Connect the fuel pump resistor connector.

End Of Sie

DLC-2

acxuuw00000288

A

E

C

D

MAIN FUSE BLOCK
(FUEL PUMP RELAY)

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FUEL PUMP RESISTOR

acxuuw00002402

1

2

acxuuw00002403

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FUEL SYSTEM [L3 WITH TC]

01-14–16

FUEL PUMP RESISTOR INSPECTION[L3 WITH TC]

id011439801300

Resistance Inspection

1. Disconnect the negative battery cable. (See 01-17-2 BATTERY REMOVAL/INSTALLATION[L3 WITH TC].)
2. Remove the fuel pump resister. (See 01-14-15 FUEL PUMP RESISTOR REMOVAL/INSTALLATION[L3 WITH

TC].)

3. Verify that the continuity between the fuel pump

resister terminal A and B is within the
specification.

• If not within the specification, replace the fuel

resistor.

Fuel pump resistor continuity

0.304— 0.336 ohms (20

°C {68 °F})

End Of Sie

HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION[L3 WITH TC]

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Caution

• Do not disassemble the high pressure fuel pump.

• Do not scratch or damage the fuel sealing surface of the high and low fuel ports.

• When removing the high pressure fuel pipe, secure the joint (pump side) so that it dose not rotate,

and loosen the screw (pipe side).

Note

• If the high pressure fuel pump is removed, replace the O-ring with a new one.

1. Complete the “BEFORE REPAIR PROCEDURE”. (See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH

TC].)

2. Disconnect the negative battery cable.
3. Remove the charge air cooler duct.
4. Disconnect the spill valve control solenoid valve connector.
5. Disconnect the quick release connector on the high pressure fuel pump. (See01-14-19 QUICK RELEASE

CONNECTOR REMOVAL/INSTALLATION[L3 WITH TC].)

6. Remove the battery and battery tray. (See01-17-2 BATTERY REMOVAL/INSTALLATION[L3 WITH TC].)
7. Remove the air duct. (See 01-13-5 INTAKE AIR SYSTEM REMOVAL/INSTALLATION[L3 WITH TC])

A

B

acxuuw00002331

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