Infiniti FX35, FX50 (S51). Manual - part 755

PRECAUTIONS

EC-561

< PRECAUTION >

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• When connecting ECM harness connector (A), fasten (B) it

securely with a lever as far as it will go as shown in the figure.

• When connecting or disconnecting pin connectors into or

from ECM, never damage pin terminals (bends or break).
Make sure that there are not any bends or breaks on ECM pin
terminal, when connecting pin connectors.

• Securely connect ECM harness connectors.

A poor connection can cause an extremely high (surge) volt-
age to develop in coil and condenser, thus resulting in dam-
age to ICs.

• Keep engine control system harness at least 10 cm (4 in) away

from adjacent harness, to prevent engine control system mal-
functions due to receiving external noise, degraded operation
of ICs, etc.

• Keep engine control system parts and harness dry.
• Before replacing ECM, perform ECM Terminals and Reference

Value inspection and make sure ECM functions properly.
Refer to 

EC-499, "Reference Value"

.

• Handle mass air flow sensor carefully to avoid damage.
• Never clean mass air flow sensor with any type of detergent.
• Never disassemble electric throttle control actuator.
• Even a slight leak in the air intake system can cause serious

incidents.

• Never shock or jar the camshaft position sensor, crankshaft

position sensor.

• After performing each TROUBLE DIAGNOSIS, perform DTC

Confirmation Procedure or Component Function Check.
The DTC should not be displayed in the DTC Confirmation
Procedure if the repair is completed. The Component Func-
tion Check should be a good result if the repair is completed.

1.

ECM

C.

Loosen

JMBIA0029ZZ

PBIB0090E

MEF040D

SEF217U

EC-562

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PRECAUTIONS

• When measuring ECM signals with a circuit tester, never allow

the two tester probes to contact.
Accidental contact of probes will cause a short circuit and
damage the ECM power transistor.

• Never use ECM ground terminals when measuring input/out-

put voltage. Doing so may result in damage to the ECM’s tran-
sistor. Use a ground other than ECM terminals, such as the
ground.

• B1 indicates bank 1, B2 indicates bank 2 as shown in the fig-

ure.

• Never operate fuel pump when there is no fuel in lines.
• Tighten fuel hose clamps to the specified torque.

• Never depress accelerator pedal when starting.
• Immediately after starting, never rev up engine unnecessarily.
• Never rev up engine just prior to shutdown.

SEF348N

SEC893C

SEF709Y

PRECAUTIONS

EC-563

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• When installing C.B. ham radio or a mobile phone, be sure to

observe the following as it may adversely affect electronic
control systems depending on installation location.

- Keep the antenna as far as possible from the electronic con-

trol units.

- Keep the antenna feeder line more than 20 cm (8 in) away

from the harness of electronic controls.
Never let them run parallel for a long distance.

- Adjust the antenna and feeder line so that the standing-wave

ratio can be kept smaller.

- Be sure to ground the radio to vehicle body.

SEF708Y

EC-564

< PREPARATION >

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PREPARATION

PREPARATION

PREPARATION

Special Service Tools

INFOID:0000000005237134

NOTE:
The actual shapes of Kent-Moore tools may differ from those of special service tools illustrated here.

Commercial Service Tools

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Tool number
(Kent-Moore No.)
Tool name

Description

(J-44321)
Fuel pressure gauge 
kit

Checks fuel pressure

LEC642

Tool name
(Kent-Moore No.)

Description

Leak detector 
i.e.: (J-41416)

Locates the EVAP leak

EVAP service port 
adapter
i.e.: (J-41413-OBD)

Applys positive pressure through EVAP service 
port

Fuel filler cap adapter
i.e.: (MLR-8382)

Checks fuel tank vacuum relief valve opening 
pressure

Socket wrench

Removes and installs engine coolant temperature 
sensor

S-NT703

S-NT704

S-NT815

S-NT705