Mazda CX 7. Manual — part 126

FUEL SYSTEM [L3 WITH TC]

01-14–25

01-14

Fuel Injector Removal Note

Note

• Depending on the driving conditions, carbon may accumulate on the inserted part of the fuel injector,

causing the fuel injector to stick. Remove the fuel injector using the following procedure.

1. Install the SST to the fuel injector confirming that

the SST faces the correct direction as shown in
the figure.

Caution

• If the SST slips while ratcheting up the

fuel injector, the fuel injector or
surrounding parts could be damaged.
Press fit the SST to the fuel injector firmly
and operate carefully.

• When ratcheting up the fuel injector, the

fuel injector connector may contact the
cylinder head and damage the fuel
injector. Ratchet up the fuel injector so
that the fuel injector connector does not
contact the cylinder head.

Note

• If fuel injector No.3 contacts the oil

separator, cut the tab on the oil separator as
shown in the figure. Carefully cut the tab so
that the oil separator is not deformed or
damaged, with no clearance on the mating
surfaces of the oil separator and engine.

2. Keep ratcheting the SST so that the fuel injector becomes free enough to ratchet up without using the SST.

Caution

• Do not apply excessive force to the fuel injector connector because the fuel injector could be

damaged.

3. Pull out the fuel injector by ratcheting it upright.
4. Verify that there are no gasket in the cylinder heads after removing the fuel injectors.

Warning

• If foreign material such as metal shavings penetrates the fuel injector installation hole on the

cylinder block, the engine could be damaged. Remove all foreign material and cap the fuel injector
installation hole after removing the fuel injector.

5. Clean the fuel injector and around the insertion hole using a vacuum cleaner.

OIL

OIL

DEEP OPENING
SIDE

CONNECTOR
SIDE

FUEL
INJECTOR

49 G013 101

R

R

GASKET

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6 mm {0.2 in}
OR LESS

PCV VALVE

TAB

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FUEL SYSTEM [L3 WITH TC]

01-14–26

Fuel Delivery Pipe Installation Note

1. Tighten the bolts in the order shown in the figure.

Tightening torque

17— 23 N·m {1.8— 2.3 kgf·m, 13— 16 ft·lbf}

High Pressure Line Pipe Installation Note

1. Temporarily tighten the bolts in the order shown in the figure.

2. Tighten No.1 bolts shown in the figure.

Tightening torque

17— 23 N·m {1.8— 2.3 kgf·m, 13— 16 ft·lbf}

1

3

5

4

2

FUEL DELIVERY PIPE

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2

3

1

4

R

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FUEL SYSTEM [L3 WITH TC]

01-14–27

01-14

3. Tighten No.2 bolts shown in the figure.

(1) Fix the joint nut with a wrench on the high pressure fuel pump side as shown in the figure.
(2) Tighten the high pressure line pipe installation nut.

Tightening torque

23.5— 35.5 N·m {2.40— 3.61 kgf·m, 17.4— 26.1 ft·lbf}

4. Tighten No.3, No.4 bolts shown in the figure.

Tightening torque

17— 23 N·m {1.8— 2.3 kgf·m, 13— 16 ft·lbf}

End Of Sie

FUEL INJECTOR INSPECTION[L3 WITH TC]

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Operation Test

1. Carry out the “Fuel Injector Operation Inspection”. (See01-03-78 ENGINE CONTROL SYSTEM OPERATION

INSPECTION[L3 WITH TC].)

• If not as specified, perform the further inspection for the fuel injectors.

Resistance Inspection

Note

• Perform the following procedure only when directed.

1. Turn the ignition switch to the LOCK position.
2. Disconnect the negative battery cable.
3. Remove the fuel delivery pipe. (See 01-14-23 FUEL INJECTOR REMOVAL/INSTALLATION[L3 WITH TC].)
4. Disconnect the fuel injector connectors.
5. Measure the resistance of the fuel injector using a

tester.

• If not as specified, replace the fuel injector.

(See01-14-23 FUEL INJECTOR REMOVAL/
INSTALLATION[L3 WITH TC].)

• If as specified but “Operation Test” is failed,

carry out the “Circuit Open/Short Inspection”.
Inspect for open or short circuit.

Fuel injector resistance

1.0— 1.2 ohms [20

°C {68 °F}]

DO NOT ALLOW JOINT

NUT TO ROTATE

HIGH PRESSURE

LINE PIPE

SPILL VALVE CONTROL

SOLENOID VALVE

JOINT NUT

HIGH PRESSURE LINE

PIPE INSTALLATION NUT

WATER OUTLET CASE

INSTALLATION BOLT

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A

B

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FUEL SYSTEM [L3 WITH TC]

01-14–28

Circuit Open/Short Inspection

1. Disconnect the PCM connector. (See01-40-6 PCM REMOVAL/INSTALLATION[L3 WITH TC].)
2. Inspect the following wiring harnesses for an

open or short circuit (continuity check).

Open circuit

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

— No.1 cylinder fuel injector terminal A and PCM terminal 2BB

— No.2 cylinder fuel injector terminal A and PCM terminal 2BC

— No.3 cylinder fuel injector terminal A and PCM terminal 2BD

— No.4 cylinder fuel injector terminal A and PCM terminal 2AZ

— No.1 cylinder fuel injector terminal B and PCM terminal 2BG

— No.2 cylinder fuel injector terminal B and PCM terminal 2BH

— No.3 cylinder fuel injector terminal B and PCM terminal 2BH

— No.4 cylinder fuel injector terminal B and PCM terminal 2BG

Short circuit

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

— No.1 cylinder fuel injector terminal A and power supply

— No.1 cylinder fuel injector terminal A and body ground

— No.2 cylinder fuel injector terminal A and power supply

— No.2 cylinder fuel injector terminal A and body ground

— No.3 cylinder fuel injector terminal A and power supply

— No.3 cylinder fuel injector terminal A and body ground

— No.4 cylinder fuel injector terminal A and power supply

— No.4 cylinder fuel injector terminal A and body ground

— No.1 cylinder fuel injector terminal B and power supply

— No.1 cylinder fuel injector terminal B and body ground

— No.2 cylinder fuel injector terminal B and power supply

— No.2 cylinder fuel injector terminal B and body ground

— No.3 cylinder fuel injector terminal B and power supply

— No.3 cylinder fuel injector terminal B and body ground

— No.4 cylinder fuel injector terminal B and power supply

— No.4 cylinder fuel injector terminal B and body ground

End Of Sie

WM: PRESSURE REGULATOR

PRESSURE REGULATOR INSPECTION[L3 WITH TC]

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Note

• Due to the adoption of the mechanical returnless fuel system, the pressure regulator cannot be inspected

separately.

1. Perform “FUEL LINE PRESSURE INSPECTION”. (See 01-14-5 FUEL LINE PRESSURE INSPECTION[L3

WITH TC].)

End Of Sie

A

B

FUEL INJECTOR
WIRING HARNESS SIDE CONNECTOR

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2BE 2BA 2AW 2AS 2AO 2AK 2AG 2AC 2Y 2U 2Q 2M

2E

2A

2I

2BH 2BD 2AZ 2AV 2AR 2AN 2AJ 2AF 2AB 2X 2T 2P

2H

2D

2L

2BG 2BC 2AY 2AU 2AQ 2AM 2AI 2AE 2AA 2W 2S 2O

2G

2C

2K

2BF 2BB 2AX 2AT 2AP 2AL 2AH 2AD 2Z

2V 2R 2N

2F

2B

2J

1BE 1BA 1AW 1AS 1AO 1AK 1AG 1AC 1Y 1U 1Q 1M

1E

1A

1I

1BH 1BD 1AZ 1AV 1AR 1AN 1AJ 1AF 1AB 1X

1T

1P

1H

1D

1L

1BG 1BC 1AY 1AU 1AQ 1AM 1AI 1AE 1AA 1W 1S 1O

1G

1C

1K

1BF 1BB 1AX 1AT 1AP 1AL 1AH 1AD 1Z

1V

1R 1N

1F

1B

1J

PCM

WIRING HARNESS-SIDE CONNECTOR

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